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1
CHATTERJEE, TAPAS, IGOR DOVGAL, ROSAURA MAYÉN-ESTRADA, and GREGORIO FERNANDEZ-LEBORANS. "A checklist of ciliates (Ciliophora) inhabiting on ostracods (Crustacea, Ostracoda)." Zootaxa 4763, no. 1 (April 8, 2020): 17–30. http://dx.doi.org/10.11646/zootaxa.4763.1.2.
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A compilation of the ciliated species found on freshwater and marine ostracods as epibiont or parasite (endobiont) has been carried out based on published records. The checklist includes the taxonomic position of each species of epibiontic and endobiontic ciliate, the species of basibiont ostracodes, the geographic zones and the bibliographic references where they were recorded. Altogether 7 suctorian, 29 peritrich, one apostome and one scuticociliatid species were listed. Two of recorded suctorian species are possible specific to marine ostracodes, whereas only one, Tokophrya sibirica to freshwater hosts. Fourteen species of peritrichs are likely specific to freshwater ostracodes, while three possible specific to marine ostracode hosts. Other suctorian and peritrich ciliate species were found on a variety of host taxa. One species of scuticociliatid was recorded as endobiont in ostracod.
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Ayress, Michael A. "Crescenticythere, a new enigmatic ostracode from the Tertiary of New Zealand." Journal of Paleontology 67, no. 5 (September 1993): 905–6. http://dx.doi.org/10.1017/s0022336000037197.
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During examination of the large ostracode assemblage collections at the Department of Scientific and Industrial Research, Geology & Geophysics, Lower Hutt, New Zealand, a single specimen of unusual shape was encountered. So unusual is the crescentic outline and infolding of the entire shell periphery that assignment even to a phylum was difficult, and it was only upon scanning electron microscopic study that subcentral muscle scars were clearly observed and these enabled confident identification of the specimen as an ostracode. One specimen is not usually considered sufficient to propose a new taxon; however, in this case there is no doubt that this unique specimen clearly represents a new species, genus, and probably family of Ostracoda. A search for additional specimens from the type unit is underway, but has, as yet, been unsuccessful to find this rare intriguing ostracode. Unlike other unusual ostracodes described from the Southern Hemisphere such as the punciids, this specimen appears to have no similarity with Paleozoic taxa.
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Baltanás, Angel, Wolfgang Brauneis, Dan L. Danielopol, and Johann Linhart. "Morphometric Methods for Applied Ostracodology: Tools for Outline Analysis of Nonmarine Ostracodes." Paleontological Society Papers 9 (November 2003): 101–18. http://dx.doi.org/10.1017/s1089332600002175.
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Morphometric techniques for the analysis of shape change in organisms have experienced a noteworthy development in the last decade. But despite the significant contributions that ostracodologists made to the field, their use in standard ostracode research is far from common. This contribution stresses the usefulness of morphometric methods to describe ostracode valve outlines and to summarize shape changes cued by environmental factors. Focus is on nonmarine ostracodes which are generally poorly ornamented so that their carapaces offer few landmarks for characterization of morphological change. Out of several alternatives three techniques for shape analysis are applied here: the B-splines method for approximative description of ostracode contours, Elliptic Fourier Analysis (EFA) and a Generalized (Resistant Fit) Procrustes Analysis. B-splines method is presented here for the first time within a biological framework and both its mathematical basis and practical usage are discussed. Additionally a computer program, Morphomatica, developed for performing B-splines analyses of ostracod outlines is briefly documented.Three case studies exemplify here how morphometric analysis might help either to detect environmental influences in ostracode shape or to show how morphological diversity of ostracode valve reflects environmental change. First, morphological variability within a clonal lineage of Heterocypris barbara (Gauthier and Brehm) is shown to be related to environmental variables (mainly temperature) when raised under controlled conditions in the lab. Second, carapace variability at the population level is explored in a widely distributed species (Limnocythere inopinata Baird) sampled from distant localities. Morphometric analyses illustrate how such variability is not related to geographic distance but to environmental conditions. Finally, patterns of temporal change in morphological diversity of a widely distributed ostracode group, the Candoninae, are elucidated by using the B-splines method combined with multivariate statistical analysis.It is concluded that morphometric methods deserve to be included in the methodological toolbox of practicing ostracodologists as they can provide useful information in ecological and paleoecological research.
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Yasuhara, Moriaki, Yuanyuan Hong, Skye Yunshu Tian, Wing Ki Chong, Rachel Wai Ching Chu, Hisayo Okahashi, Markus Reuter, Werner E. Piller, and Mathias Harzhauser. "Early Miocene marine ostracodes from southwestern India: implications for their biogeography and the closure of the Tethyan Seaway." Journal of Paleontology 94, S80 (August 2020): 1–36. http://dx.doi.org/10.1017/jpa.2020.44.
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AbstractTwenty-six genera and 34 species of early Miocene Indian shallow-marine ostracodes were examined for taxonomy and paleobiogeography. A new genus Paractinocythereis and new species Costa ponticulocarinata were described. Early Miocene Indian ostracode fauna shows strong affinity to Eocene–Miocene Eastern and Western Tethyan ostracode faunas and Miocene–Recent Indo-Pacific ostracode fauna, supporting the Hopping Hotspot Hypothesis that the Tethyan biodiversity hotspot has shifted eastward through Arabia to Indo-Australian Archipelago (IAA) together with concomitant biogeographic shifts of the Tethyan elements. The result also indicated an inverse westward distributional shift in a genus. It is important to note that Paleogene and Miocene shallow marine ostracodes from the IAA region remain poorly investigated, and more fossil ostracode data are needed to better test the Hopping Hotspot Hypothesis.UUID: http://zoobank.org/d1e29249-8c5b-49bf-a47a-5f18e1fc4426
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Antonietto, Lucas S., Lisa E. Park Boush, Celina A. Suarez, Andrew R. C. Milner, and James I. Kirkland. "The ‘Last Hurrah of the Reigning Darwinulocopines’? Ostracoda (Arthropoda, Crustacea) from the Lower Jurassic Moenave Formation, Arizona and Utah, USA." Journal of Paleontology 92, no. 4 (April 26, 2018): 648–60. http://dx.doi.org/10.1017/jpa.2017.150.
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AbstractAn ostracode fauna is described from lacustrine sediments of the Hettangian, Lower Jurassic, Whitmore Point Member of the Moenave Formation. The Moenave is well known for its rich, Late Triassic?–Early Jurassic fossil record, which includes fossil fishes, stromatolites, ostracodes, spinicaudatans, and a diverse ichnofauna of invertebrates and vertebrates. Four ostracode species, all belonging to the suborder Darwinulocopina, were recovered from these sediments:Suchonellina globosa,S. stricta,Whipplella? sp. 1, andW.? sp. 2. The diversity and composition of the Whitmore Point Member ostracode fauna agree with previous interpretations about Lake Dixie and nearby paleoenvironments as shallow lakes inhabited by darwinulocopine species that survived the effects of the Central Atlantic Magmatic Province and the subsequent end-Triassic extinction and quickly recolonized these areas, thanks to asexual reproduction by parthenogenesis. The Lake Dixie region, in its geographical isolation, could represent the last episode of darwinulocopine dominance in nonmarine environments before the Late Jurassic diversification of the cypridocopine/cytherocopine modern ostracodes.
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Tanaka, Gengo. "Paleogeographical and paleoenvironmental significance of ostracodes from the Pennsylvanian Nagaiwa Formation, northeast Japan." Journal of Paleontology 97, S92 (March 23, 2023): 1–33. http://dx.doi.org/10.1017/jpa.2022.108.
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AbstractThe Early Pennsylvanian Nagaiwa Formation contains fossils such as corals, fusulinids, and ostracodes, and its age and depositional environments have been determined by fusulinids and sedimentology. In this study, I describe the ostracode assemblages from the Nagaiwa Formation. Moreover, I provide a reconstruction of the paleogeography of northeastern Japan during the Early Pennsylvanian by comparing this ostracode assemblage with assemblages from other regions during the same period. Thirty ostracode species, including 12 genera, have been identified, most of which are endemic species and 10 of which are new: Jordanites michinokuensis n. sp., Thuringobolbina ikeyai n. sp., Aechmina iwatensis n. sp., Pseudobythocypris asiatica n. sp., P. zipangu n. sp., P. siveteri n. sp., Platyrhomboides tohokuensis n. sp., P. japonica n. sp., Healdia ofunatensis n. sp., and H. rikutyuensis n. sp. Two of these species are also found in central Japan. The ostracodes from the Nagaiwa Formation are unique when compared with any other similarly aged assemblages.UUID: http://zoobank.org/c43f0787-4bb6-45d1-9c12-54a747c0b040
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Curry, B. Brandon. "Linking Ostracodes to Climate and Landscape." Paleontological Society Papers 9 (November 2003): 223–46. http://dx.doi.org/10.1017/s1089332600002229.
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Climatic effects on aquatic environments are an important factor in the ecology of ostracodes judging from their biogeography especially with respect to moisture balance and ecoregions (vegetation zones). The importance of climate in controlling ostracode distribution is underscored by major ecological changes indicated by co-stratigraphic changes in ostracode and pollen biozones throughout the Quaternary. Climatic interpretation of ostracode records are complicated, however, by several non-climatic factors, including basin shoaling, changes in water chemistry due to abrupt changes in the flux of groundwater, rivers, and streams to lakes and wetlands, and increasingly shortened water residence time in areas where precipitation exceeds evaporation due to erosion by basin overflow.
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Tinn, Oive, and Tõnu Meidla. "Ordovician ostracodes from the Komstad Limestone." Bulletin of the Geological Society of Denmark 46 (December 20, 1999): 25–30. http://dx.doi.org/10.37570/bgsd-1999-46-03.
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The results of a pilot study on late Arenigian ostracodes of Bornholm, Denmark, are reported. The hard thermally altered limestone was disintegrated with sodium hyposulphite, the yielded ostracode material is of satisfactory preservation. The ten identified genera include palaeocopes (Glossomorphites, Aulacopsis, Ctenentoma, Asteusloffia, Euprimites), eridostracans (Conchoprimitia), cytherelliformes (Unisulcopleura) and metacopes (Elliptocyprites, Longiscula, Microcheilinella and “Silenis”). The studied ostracode assemblage shows resemblance to that of the Central Baltoscandian Confacies Belt.
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Sugumaran, S., H. M. Nagaraj, and U. B. Mallikarjuna. "Ostracode fauna from the Patti Formation (Late Cretaceous) of Vridhachalam area, Tamil Nadu, India." Journal of Palaeosciences 46, no. (1-2) (December 31, 1997): 133–40. http://dx.doi.org/10.54991/jop.1997.1327.
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An ostracode fauna is recorded from the Patti Formation (Late Cretaceous) of Vridhachalam area, Tamil Nadu. The assemblage includes Bairdia pentagonalis, B. cretacea, B. supplanata, Macrocypris limburgensis and Paracypris limburgensis, which are typical of Maestrichtian age. The ostracodes show strong affinities with those recorded from the Ariyalur and Pondicherry areas, and those described from the type-Maestrichtian of Holland. The above assemblage and the presence of distinct Paleocene ostracodes in the overlying Pondicherry Formation throw light on K/T transition in the Vridhachalam area. The paper also discusses the stratigraphic distribution and zoogeographic affinities of the ostracode fauna with equivalent formations in India and the type areas elsewhere.
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Costanzo, Gary V., and Roger L. Kaesler. "Changes in Permian marine ostracode faunas during regression, Florena Shale, northeastern Kansas." Journal of Paleontology 61, no. 6 (November 1987): 1204–15. http://dx.doi.org/10.1017/s0022336000029577.
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The Florena Shale (Permian, Wolfcampian) of the Midcontinent of North America was deposited in a restricted marine basin. Shifting environments due to marine regression caused a gradual change in the ostracode fauna. Cluster analysis and ordination by nonmetric multidimensional scaling of data on ostracode relative abundances revealed three ostracode assemblages, each characteristic of a different environment. The Cryptobairdia seminalis assemblage from the lowest Florena Shale is characteristic of deeper water, offshore, marine environments with only minor influx of terrigenous mud. The Amphissites centronotus assemblage found above the C. seminalis assemblage occupied a similar environment, but with greater influx of terrigenous mud and intervals of increased turbidity. The Knightina texana assemblage occurs stratigraphically highest and probably represents a quiet-water, very shallow, nearshore, marine environment. Although protected from strong wave and current activity, the water mass was occasionally turbid.Species diversity of ostracodes is high both at the base of the Florena Shale, which was deposited in the most offshore position, and again at the top of the lower part of the Florena Shale, which was deposited nearer to the shore. In contrast to diversities of assemblages of ostracodes from similar environments in other stratigraphic units, the K. texana assemblage has an anomalously high diversity. This is due in part to time averaging of adjacent ostracode assemblages and a strong taphonomic overprint.
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Holmes, Jonathan A. "Future Trends and Goals in Ostracode Research." Paleontological Society Papers 9 (November 2003): 275–90. http://dx.doi.org/10.1017/s1089332600002254.
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In recent decades, research on ostracodes has grown dramatically. While many aspects of the group have been investigated, this review focuses on the paleoenvironmental applications of ostracodes from marine and nonmarine environments. It is argued that while ostracodes have great potential as paleoenvironmental tools, much of that potential has not yet been fully realized because of our imperfect understanding of ostracode biology, taxonomy, systematics and ecology. Future developments will be sure to result from additional studies in these areas, and will also be effected by exchange of ideas with scientists working on related proxies. However, the flow of ideas should not be one-way; workers in other disciplines can also learn from the study of ostracodes.
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Kaesler, Roger L., and Michael S. Cormack. "Ostracoda on the Internet." Paleontological Society Papers 9 (November 2003): 265–74. http://dx.doi.org/10.1017/s1089332600002242.
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Information abounds on the Internet. Information about the Ostracoda is no exception. Here we assess 40 web sites that deal fully or in part with a wide variety of aspects of ostracode biology, paleontology, and ecology.
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Yasuhara, Moriaki, Maria Grimm, Simone N. Brandão, Anna Jöst, Hisayo Okahashi, Hokuto Iwatani, Alexandra Ostmann, and Pedro Martínez Arbizu. "Deep-sea Benthic Ostracodes from Multiple Core and Epibenthic Sledge Samples in Icelandic Waters." Polish Polar Research 35, no. 2 (July 29, 2014): 341–60. http://dx.doi.org/10.2478/popore-2014-0001.
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AbstractDeep-sea benthic Ostracoda (Crustacea) in Icelandic waters are poorly known. Here we report deep-sea ostracode assemblages from the multiple core (MUC) and the epibenthic sledge (EBS) samples collected from Icelandic waters by the first cruise of the IceAGE (Icelandic Marine Animals: Genetics and Ecology) project. Samples from shelf-edge and lower-bathyal working areas are examined. The results show (1) distinct MUC and EBS faunas due to the large difference in mesh size of MUC and EBS; and (2) distinct shelf-edge and lower-bathyal ostracode faunas. Such remarkable faunal turnover from shelf to bathyal depths is similar to the faunal turnovers reported from depth transects in the adjacent regions of the western North Atlantic Ocean, the Greenland Sea, and the North Sea, but, at the same time, there are certain differences in the faunal composition between the Icelandic waters and these adjacent regions. In addition, we illustrate many Icelandic deep-sea ostracode species with high-resolution scanning electron microscopy and composite all-in-focus stereomicroscopic images for the first time. These results provide important basic information on deep-sea ostracode research and biogeography of this important region connecting North Atlantic proper and Nordic Seas.
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Iwatani, Hokuto, Sansfica M. Young, Toshiaki Irizuki, Yoshikazu Sampei, and Hiroaki Ishiga. "Spatial variations in recent ostracode assemblages and bottom environments in Trincomalee Bay, northeast coast of Sri Lanka." Micropaleontology 60, no. 6 (2014): 509–18. http://dx.doi.org/10.47894/mpal.60.6.02.
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Trincomalee Bay is situated on the northeast coast of Sri Lanka. This is the first study to report the recent ostracode assemblages in this bay. As a result, at least 36 ostracode taxa were identified from surface sediments in the bay. Many of them are typical tropical-water species that have been reported from inner bays and shallow marine areas around the coast of the Indo-Pacific region. We compared the species composition of ostracodes in the study area with that in adjacent seas. The result clearly showed that ostracode assemblages from Sri Lanka have strong connection with those along the coast of the Indian subcontinent. Moreover we evaluated the bottom environment in Trincomalee Bay on the basis of statistical analyses of ostracode assemblages combined with grain size, and total organic carbon (TOC) and total nitrogen (TN) contents. The results showed that the TOC content is related to grain size and is relatively high in the inner part of Inner Harbor and Koddiyar Bay, where fine-grained sediments are distributed. Four biofacies were recognized based on Q-mode cluster analysis using ostracode data for 36 taxa. Biofacies I is consistent with distributions of fine-grained sediments with moderate TOC contents (0.30%–0.49 %). Biofacies II is collected from relatively deep water areas with sediments of low TOC contents (0.22%–0.41 %) in InnerHarbor. Biofacies III and IVare characterized by euryhaline species and are influenced by fresh water and shallow depth with low TOC contents (0.14%–0.37%) in sediments. The ostracode distribution in Trincomalee Bay is depend on natural environmental factors such as water depth, grain-size, TOC contents of sediments, and water salinity.
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Yasuhara, Moriaki, and Hisayo Okahashi. "Quaternary deep-sea ostracode taxonomy of Ocean Drilling Program Site 980, eastern North Atlantic Ocean." Journal of Paleontology 88, no. 4 (July 2014): 770–85. http://dx.doi.org/10.1666/13-125.
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Ocean Drilling Program (ODP) Holes 980 B and C, Feni Drift at the eastern slope of the Rockall Plateau, eastern North Atlantic, were examined for late Quaternary deep-sea ostracode taxonomy. Nineteen genera and 32 species were examined and (re-)illustrated with high-resolution scanning electron microscopy images. One new speciesCytheropteron paramassonin. sp. is described and one new nameEucytherura zehaliis proposed forEucytherura hazeliYasuhara et al., 2009. This study provides updated taxonomic information for deep-sea ostracode genera and species from the eastern North Atlantic, which is an important baseline for application of deep-sea ostracodes to paleoceanographical reconstructions and paleoecological studies in this region.
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Coimbra, João C., Ana L. Carreño, Eduardo A. Geraque, and Beatriz B. Eichler. "Ostracodes (Crustacea) from Cananéia-Iguape estuarine/lagoon system and geographical distribution of the mixohaline assemblages in southern and southeastern Brazil." Iheringia. Série Zoologia 97, no. 3 (September 30, 2007): 273–79. http://dx.doi.org/10.1590/s0073-47212007000300010.
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The ostracode assemblages from Cananéia-Iguape estuarine/lagoon system (southernmost State of São Paulo) are here discussed in detail for the first time. Thirty-four sites, approximately 1 km equidistant, were sampled along the system, including the Cananéia Sea, Pequeno Sea, Cubatão Sea, Ribeira de Iguape River and Itapitangui River. The ostracodes throughout this area have poor assemblages, with a total of 662 specimens of dead and living organisms. The majority of the ostracode fauna is composed of euryhaline species, as follows: Cyprideis multidentata Hartmann, 1955 (174 specimens), Minicythere heinii Ornellas, 1974 (54 specimens), Tanella gracilis Kingma, 1948 (96 specimens) and Whatleyella sanguinettiae Coimbra, Carreño & Ferron, 1994 (226 specimens). Although there are few studies on the Brazilian mixohaline ostracode faunas, including the euryhaline marginal marine taxa, the published data show that the group is best known in the south and southeast regions. Based on this review and with the new data presented in this paper, the geographical distribution of eight mixohaline key species in southern and southeastern Brazil is also discussed.
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Lawrence, James R., Kiseong Hyeong, Rosalie F. Maddocks, and Kwang-Sik Lee. "Passage of Tropical Storm Allison (2001) over southeast Texas recorded in δ18O values of Ostracoda." Quaternary Research 70, no. 2 (September 2008): 339–42. http://dx.doi.org/10.1016/j.yqres.2008.04.004.
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AbstractFreshwater Ostracoda collected in ephemeral pond-waters derived from Tropical Storm Allison (2001, Texas) recorded the unusually low oxygen-isotope values of that storm. Therefore, the potential clearly exists, in locations where tropical cyclones make landfall, to obtain a long-term record of tropical cyclone activity from fossil ostracode calcite.
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Sobolev, D. B. "Ostracodes from the Devonian-Carboniferous boundary deposits on the reference section Yjid-Kamenka river (Pechora Uplift)." Vestnik of Geosciences 12 (2020): 4–25. http://dx.doi.org/10.19110/geov.2020.12.1.
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This article presents new data on ostracodes and their stratigraphic distribution in the boundary deposits of the Devonian and Carboniferous (D3-C1) in the reference section Kamenka River (Pechora Uplift). The positions of the Kamenka River section and stratotypic sections of the southern Urals relative to the transgressive-regressive sequence are considered. The ostracode assemblage of the Ps. venulosa — Cor. alba — Cr. primaris zone, which occurs in the section on the Kamenka River and appears in sections of the southern Urals from the base of this zone, is represented by the following taxa: Pseudoleperditia venulosa (Kummerov), Coryellina alba Kotschetkova, Bairdia zaninae Posner, Blessites feluyensis Tschigova, Shishaella alekseevae Tschigova, Knoxiella complanata (Kummerov), Cavellina subeichwaldi Buschmina. The taxonomic characteristics of the upper part of the Pseudoleperditia venulosa — Coryellina alba — Cribroconcha primaris ostracode zone (Gumerovian Regional Substage (Horizon)) are supplemented Acratia subordinaria Buschmina, Healdianella ex gr. alba Lethiers, Phlyctiscapha ? pusilla Gurevitsсh, Pustulobairdia ex gr. confragosa (S. et Sm.), Acanthoscapha pechorica Sobolev, Acratina romboiformis Sobolev, and Rectobairdia eleganta Sobolev first appear at this level A gradual and insignificant change in the ostracode association is observed during the transition from the Gumerovian Horizon to the Malevkian Horizon, which precludes drawing the boundary between them. It is suggested that it would have been more appropriate to draw the boundary at the base of the global Hangenberg transgressive event near the base of the Ps. venulosa — Cor. alba — Cr. primaris ostracode zone (South Urals), which coincides with the initial phase of this transgression.
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Kontrovitz, Mervin, Jerry Marie Slack, Nigel R. Ainsworth, and Richard D. Burnett. "Color in ostracode shells: taphonomy and paleotemperature interpretation." Paleontological Society Special Publications 6 (1992): 172. http://dx.doi.org/10.1017/s2475262200007322.
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Interpretations of geologic history would be enhanced if taphonomic processes, including color changes in shells, were better known. This study deals with the origins and alteration of post-mortem colors in podocopid ostracodes. Modern shells were subjected to elevated temperatures and pressures in reactor vessels with sediments, simulating some burial conditions. Fossil shells from outcrops and boreholes were heated and treated with solvents, in an attempt to identify the coloring agent(s).Modern marine shells are white to pale yellow (Munsell 5Y 8/1 – 2.5Y 8/4). Upon heating at atmosphere, up to about 650°, they became slightly redder, slightly darker, and less color saturated, but never dark (Munsell “value” less than 5). From 650-850° they became yellower and lighter, and above 850° chalky and more yellow. Shells at elevated temperatures and pressures (T-P) with organic-poor sediments and/or iron compounds developed higher color values and lower chromas; they did not become dark. Thus, modern ostracode shells subjected to elevated T-P changed colors, but alone never attained the dark colors seen in many fossils. Only those heated in matured organic-rich sediment and/or crude oils became dark (dark grays, browns, and blacks), like some fossils. Fossil ostracodes from boreholes in Mesozoic and Cenozoic sedimentary rocks showed downhole color differences similar to those from experiments. That is, the colors of fossils are different in hue, value and chroma in different thermal zones and ostracode color appears to be broadly indicative of thermal history.Fossils near igneous intrusions are dark, while the lowered values and chromas of those in metamorphics also are correlatable with paleotemperatures. Reheated dark fossils lightened at about 375-450°, eventually becoming pale yellow to white, apparently indicating that organic coloring agents were driven off. This, and the fact that modern ostracodes develop dark colors only when heated in organic-rich substances, support the contention that the dark color originates from extrinsic organic materials. Pyritized shells become weak red (Munsell 10R 4/4) upon heating; thus, they can be distinguised from those colored by organics.Therefore, ostracode colors appear to be diagnostic of T-P and present the potential for use in paleotemperature reconstructions. A wide range of fossils, including conodonts, phosphatic brachiopods, scolecodonts, and palynomorphs are known to show recognizable and useful evidence of thermal maturation and it is proposed that ostracodes be added to the list.
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Sharpe, Saxon E., and Jordon Bright. "A high-elevation MIS 5 hydrologic record using mollusks and ostracodes from Snowmass Village, Colorado, USA." Quaternary Research 82, no. 3 (November 2014): 604–17. http://dx.doi.org/10.1016/j.yqres.2014.01.014.
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AbstractSediments containing terrestrial and aquatic mollusks and ostracodes from the Ziegler Reservoir fossil site (2705 m elevation) near Snowmass Village, Colorado, span ~130–87 ka (MIS 5e through 5b). The southeastern area of the site where taxa were recovered was a relatively fresh, shallow, well-vegetated wetland during MIS 5e through 5c time, approximately 2 m deep, with a total dissolved solids value of ~200–1000 mg L− 1. The wetland was seasonally or annually variable and groundwater discharged along the margins of the bounding moraine. Groundwater likely contributed solutes to the system and may have contributed 18O-enriched water. Based on stable isotopes from ostracode calcite (δ18OOST and δ13COST), seasonal evaporation occurred and the dissolved inorganic carbon pool was unexpectedly enriched in 13C. The mollusk and ostracode faunas changed little across the MIS 5e/5d/5c boundaries, whereas a distinct change in the ostracode fauna occurred between the deposition of Unit 11 and Unit 13, which corresponds in time to the MIS 5c/5b boundary, indicating some combination of increased surface and/or groundwater flow, a decrease in water temperature, and a freshening and a possible deepening of the wetland.
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Crasquin, Sylvie, Milan Sudar, Divna Jovanovic, and Tea Kolar-Jurkovsek. "Upper Permian ostracode assemblage from the Jadar Block (Vardar zone, NW Serbia)." Annales g?ologiques de la Peninsule balkanique, no. 71 (2010): 23–35. http://dx.doi.org/10.2298/gabp1071023c.
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Ostracodes from the Changhsingian (latest Permian age) in the uppermost part of the ?Bituminous Limestone? Formation of the Komiric Section in NW Serbia (Jadar Block, Vardar Zone) are described and illustrated. Three new species of ostracodes are introduced: Basslerella jadarensis n. sp., Acratia serbianella n. sp., and Knoxiella vardarensis n. sp. The ostracode assemblage, together with conodonts and foraminifers, is the first record of the youngest Late Permian age microfaunas from Serbia and from the central part of the Balkan Peninsula.
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Cheung, Richard Ching Wa, Moriaki Yasuhara, Hokuto Iwatani, Chih-Lin Wei, and Yun-wei Dong. "Benthic community history in the Changjiang (Yangtze River) mega-delta: Damming, urbanization, and environmental control." Paleobiology 45, no. 3 (July 22, 2019): 469–83. http://dx.doi.org/10.1017/pab.2019.21.
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AbstractThe coastal environment of the Changjiang delta has been influenced by recent anthropogenic activities such as dam construction and increased sewage and fertilizer inputs. Previous work examined the compositional shift of marine plankton to assess ecological impacts of these activities on marine ecosystems in the Changjiang discharge area. Here we used benthic marine ostracodes collected in the Changjiang estuary and the adjacent East China Sea in the 1980s and the 2010s, respectively, to investigate temporal changes of the benthic community and controlling factors for the benthic fauna. Our results revealed more shoreward distribution of some well-known offshore ostracode species in the 2010s compared with the 1980s and a relatively more important role for environmental processes (e.g., bottom-water temperature, bottom-water salinity, and eutrophic conditions of surface water) than spatial processes (e.g., the flow of ocean currents) in structuring ostracode compositions. The temporal changes in the ostracode community are likely attributable to the combined effects of reduced fresh water and sediment discharge and eutrophic conditions of the Changjiang due to the many dams constructed along the Changjiang and population expansion in the Changjiang Basin. Results of redundancy analysis and variation partitioning suggest that ocean currents facilitated environmental filtering of ostracode species such that they could disperse to preferred environmental conditions. These findings highlight the potential uses of marine microfossils to better understand ecological impacts on benthic ecosystems in vulnerable Asian mega-deltas and provide insights into the integration of metacommunity concepts in disentangling dynamics of marine benthic communities.
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Hawram, Omran A. M., and Hazhar J. Ali. "NEW MIDDLE MIOCENE OSTRACODES (CRUSTACEA) FROM KURDISTAN REGION, NORTHEASTERN IRAQ." Iraqi Geological Journal 51, no. 2 (December 31, 2018): 91–123. http://dx.doi.org/10.46717/igj.51.2.6ms-2018-12-28.
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The present paper is focused on new Ostracods species obtained from Fatha Formation (Middle Miocene) in Darbaikhan area, Sulaimani Governorate, Kurdistan province North Eastern of Iraq. Forty-eight Ostracode species belonging to thirty-one genera were described, including eighteen species previously described, twenty-six new species left under open nomenclature because of lack of specimens and/or poor state of preservation.
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Sudar, Milan, Yanlong Chen, Tea Kolar-Jurkovsek, Bogdan Jurkovsek, Divna Jovanovic, and Marie-Beatrice Forel. "Lower triassic (Olenekian) microfauna from Jadar block (Gucevo mt., Nw serbia)." Annales g?ologiques de la Peninsule balkanique, no. 75 (2014): 1–15. http://dx.doi.org/10.2298/gabp1475001s.
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Systematic study of microfossil associations on the Krivi Potok section (Gucevo Mt. area, NW Serbia) has been carried out to document and to refine the Lower Triassic stratigraphic correlations within Alpine-Mediterranean domain. Field investigation and laboratory process have enabled the identification of lowermost Olenekian (lower Smithian) conodonts, ostracodes and pyrite framboids. Two conodont zones are established in this region, in ascending order they are: Pachycladina obliqua-Foliella gardenae Assemblage Zone and Neospathodus planus Zone. A new ostracode species Paracypris ? krivipotokensis FOREL n. sp. has been described, it co-occurs with conodont Neospathodus planus within the Zone of the same name. The pyrite framboids were formed within the ostracode carapaces after their death. The size distribution of pyrite framboids supports the former suggestion that large size (>6 ?m in diameter) is not suitable for the reconstruction of seawater redox conditions.
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Vannier, J. M. C., P. R. Racheboeuf, and J. L. Benedetto. "Silurian-Early Devonian ostracodes from South America (Argentina, Bolivia): Preliminary investigations." Journal of Paleontology 69, no. 4 (July 1995): 752–72. http://dx.doi.org/10.1017/s0022336000035265.
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Ostracodes are described from the “Cerro del Fuerte Section” and neighboring localities, all in the Precordillera de San Juan (northern Argentina, San Juan Province), and from sparse faunas in Bolivia (Chuquisaca, Tarabuco Province). Additional material comes from the collection of Thomas (1905). This preliminary study gives the first detailed description of ostracode assemblages in the Upper Silurian and Lower Devonian of the South American continent. Records of other abundant lower Paleozoic (Lower Ordovician to Lower Devonian) ostracodes in Argentina, Bolivia, Brazil, Peru, and Venezuela are also reviewed. Twelve different species, belonging to Palaeocopa (Beyrichiacea and Primitiopsacea) and to Binodicopa and Podocopa (Healdiacea, Thlip-suracea, Cypridacea) are described and a new genus is established (Australobollia n. gen.). Ostracode distribution at Cerro del Fuerte attests to the presence of the Siluro-Devonian boundary within the upper Los Espejos Formation and confirms recent stratigraphical attributions mainly based on conodonts and brachiopods (Benedetto et al., 1992). The beyrichiacean Hemsiella indicates a late Ludlow to Pridolian age for the lower part of upper Los Espejos Formation. The non-palaeocope “Thlipsurella-Phanasymmetria-Ranapeltis” assemblage found in the uppermost part of the formation indicates an Early Devonian (Lochkovian) age. The present study reveals the existence of faunal links at genus (Silurian) and probably species (Early Devonian) level between South America (Argentina, Bolivia), Laurentia, Avalonia-Baltica, and northern Gondwana. For example, close affinities (e.g., Ranapeltis sp. aff. rowlandi and Thlipsurella sp. aff. ellipsoclefta) exist between the uppermost Los Espejos Formation (Argentina) and contemporaneous horizons in the North American Mid-Continent (e.g., Haragan Formation, Oklahoma; Shriver Formation, Pennsylvania). Two types of ostracode assemblages, “beyrichiacean-dominated” and “thlipsuracean-bairdiacean-cypridacean dominated,” are recognized in the Late Silurian–Early Devonian of Argentina and discussed relative to other assemblages known in Laurentia, Avalonia-Baltica, and northern Gondwana. Their paleoecological significance in relation to marine bathymetry is addressed.
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Ito, Emi, Patrick De Deckker, and Stephen M. Eggins. "Ostracodes and Their Shell Chemistry: Implications for Paleohydrologic and Paleoclimatologic Applications." Paleontological Society Papers 9 (November 2003): 119–52. http://dx.doi.org/10.1017/s1089332600002187.
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The shell chemistry of ostracodes is a useful indicator of past environmental conditions especially when the chemistry data are considered along with other proxy data. The complexities involved with the chemical and isotopic changes accompanying hydrologic change, solute evolution, and the autoecology of ostracodes all point to the need to exercise caution when interpreting shell chemistry. Nevertheless, the stable-isotope values and cation ratios (e.g., Mg/Ca, Sr/Ca) as well as the species assemblage of ostracodes can provide powerful tools for the reconstruction of paleoclimate and paleohydrology. In particular, the changes in Mg/Ca and Sr/Ca of well-calcified ostracodes shells record the qualitative changes in solute composition, and when the dissolved Mg/Ca remains relatively constant, the Mg/Ca in the ostracode shell is proportional to water temperature.
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Park, Lisa E., and R. Douglas Ricketts. "Evolutionary History of the Ostracoda and the Origin of Nonmarine Faunas." Paleontological Society Papers 9 (November 2003): 11–36. http://dx.doi.org/10.1017/s1089332600002138.
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The Ostracoda are one of the most diverse arthropod groups alive today; they also have a tremendous fossil record. Because of their widespread environmental distributions, small size and carbonate shell, they have become extremely useful biostratigraphic and paleoenvironmental proxy indicators, particularly in nonmarine environments. Despite this utility, little is known about the phylogenetic history of this important group. We reconstructed a phylogenetic history of the major orders and suborders of Ostracoda in order to test the legitimacy of current classification schemes, determine if it is possible for ostracodes to have a Precambrian origin, and test the fidelity of some of the major morphological characters that have documented trends of either increased complexity, such as the hinge and marginal pore canals, or reduction in segments, such as the adductor muscle scar.In our phylogenetic analysis to test taxonomic fidelity, we coded seven morphological hard part characters for nine taxa from the orders Archaeocopida, Leperditicopida, Palaeocopida, Podocopida, and Myodocopida. A parsimony analysis was performed using PAUP (v. 4.0) yielding 4 trees of 17 steps with low levels of homoplasy and a strong phylogenetic signal. A majority rule consensus tree indicates there is not complete agreement between the standard classification scheme and the phylogeny produced by the characters used to establish the classification. In our complete analysis of Ostracoda, we coded 28 morphological characters that included 14 hard part and 14 soft part characters for twelve taxa that include the Archaeocopida, Leperditicopida, Podocopida, and Myodocopida. A parsimony analysis was completed using PAUP (v. 4.0) yielding 1 tree of 125 steps with low levels of homoplasy and a strong phylogenetic signal. An unrooted analysis of this character set has the Cambrian Archaeopodocopida and the Ordovician-Devonian Leperditicopida in an unresolved polytomy with much younger groups such as the Myodocopina, suggesting a much deeper split in the lineage and a possible Precambrian origin for the Ostracoda. Testing the various character state acquisitions over the tree indicates that the hinge does not show an increase in complexity within a phylogenetic context, while the adductor muscle scars do show a significant trend of decrease in complexity across the tree topology. The marginal pore canals, which are functionally tied to osmoregulation as well as carapace secretion, are extremely homoplastic, indicating that this character, which is related to nonmarine invasions and tolerances, was acquired many times throughout the evolutionary history of Ostracoda.By creating an evolutionary framework for the Ostracoda such as is presented here, we can further assess character state acquisition, and how it functionally and evolutionarily relates to ostracode paleoenvironmental tolerances. The framework will not only allow us to understand the overall evolution ofthis group but will also allow us to compare the history of the ostracode clade with other groups that also have a history ofmarine and nonmarine transitions.
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YAMADA, SHINNOSUKE, AKIRA TSUKAGOSHI, and NORIYUKI IKEYA. "Carapace formation of the podocopid ostracode Semicytherura species (Crustacea: Ostracoda)." Lethaia 38, no. 4 (December 2005): 323–32. http://dx.doi.org/10.1080/00241160500355160.
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Hoare, R. D. "Ostracodes from the Maxville Limestone (Mississippian, Chesterian) from Ohio." Journal of Paleontology 67, no. 4 (July 1993): 571–85. http://dx.doi.org/10.1017/s0022336000024914.
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A diverse fauna of ostracodes comprising 21 species representing 20 genera are described from the Maxville Limestone in central Ohio. Eight new species are proposed—Roundyella incompta, Deloia spinula, Lokius morsei, Bairdia prolixa, Acratia prolata, Waylandella depresssa, Pseudobythocypris securis, and Paracavellina cooperi.Oliganisus secunda (Croneis and Bristol), Glyptopleura costata (McCoy), and Geffenina praelonga Cooper are represented by tecnomorphs and heteromorphs. Specimens of Sansabella bradfieldi Coryell and Sohn show reversal of valve overlap.The ostracode fauna indicates a Chesterian age for the Maxville Limestone.
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Stevens, Lora R., Emi Ito, Antje Schwalb, and Herbert E. Wright. "Timing of Atmospheric Precipitation in the Zagros Mountains Inferred from a Multi-Proxy Record from Lake Mirabad, Iran." Quaternary Research 66, no. 3 (November 2006): 494–500. http://dx.doi.org/10.1016/j.yqres.2006.06.008.
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AbstractA sediment core 7.2 m long from Lake Mirabad, Iran, was examined for loss-on-ignition, mineralogy, oxygen-isotopic composition of authigenic calcite, and trace-element composition of ostracodes to complement earlier pollen and ostracode-assemblage studies. Pollen, ostracode-inferred lake level, and high Sr/Ca ratios indicate that the early Holocene (10000 to 6500 cal yr BP) was drier than the late Holocene. Low δ18O values during this interval are interpreted as resulting from winter-dominated precipitation, characteristic of a Mediterranean climate. Increasing δ18O values after 6500 cal yr BP signal a gradual increase in spring rains, which are present today. A severe 600-yr drought occurred at ca. 5500 cal yr BP, shortly after the transition from pistachio-almond to oak forest. During the late Holocene, two milder droughts occurred at about 1500 and 500 cal yr BP. Within the resolution of the record, no drought is evident during the collapse of the Akkadian empire (4200–3900 cal yr BP). Rather, a decrease in δ18O values to early-Holocene levels may indicate the return to a Mediterranean precipitation regime.
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Macario-González, Laura, Sergio Cohuo, Philipp Hoelzmann, Liseth Pérez, Manuel Elías-Gutiérrez, Margarita Caballero, Alexis Oliva, Margarita Palmieri, María Renée Álvarez, and Antje Schwalb. "Geodiversity influences limnological conditions and freshwater ostracode species distributions across broad spatial scales in the northern Neotropics." Biogeosciences 19, no. 22 (November 15, 2022): 5167–85. http://dx.doi.org/10.5194/bg-19-5167-2022.
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Abstract. Geodiversity is recognized as one of the most important drivers of ecosystem characteristics and biodiversity globally. However, in the northern Neotropics, the contribution of highly diverse landscapes, environmental conditions, and geological history in structuring large-scale patterns of aquatic environments and aquatic species associations remains poorly understood. We evaluated the relationships among geodiversity, limnological conditions, and freshwater ostracodes from southern Mexico to Nicaragua. A cluster analysis (CA), based on geological, geochemical, mineralogical, and water-column physical and chemical characteristics of 76 aquatic ecosystems (karst, volcanic, tectonic) revealed two main limnological regions: (1) karst plateaus of the Yucatán Peninsula and northern Guatemala, and (2) volcanic terrains of the Guatemalan highlands, mid-elevation sites in El Salvador and Honduras, and the Nicaraguan lowlands. In addition, seven subregions were recognized, demonstrating a high heterogeneity of aquatic environments. Principal component analysis (PCA) identified water chemistry (ionic composition) and mineralogy as most influential for aquatic ecosystem classification. Multi-parametric analyses, based on biological data, revealed that ostracode species associations represent disjunct faunas. Five species associations, distributed according to limnological regions, were recognized. Structural equation modeling (SEM) revealed that geodiversity explains limnological patterns of the study area. Limnology further explained species composition, but not species richness. The influence of conductivity and elevation were individually evaluated in SEM and were statistically significant for ostracode species composition, though not for species richness. We conclude that geodiversity has a central influence on the limnological conditions of aquatic systems, which in turn influence ostracode species composition in lakes of the northern Neotropical region.
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Carreño, Ana Luisa, and Thomas M. Cronin. "Middle Eocene Ostracoda from Baja California Sur, Mexico." Journal of Micropalaeontology 12, no. 2 (December 1, 1993): 141–53. http://dx.doi.org/10.1144/jm.12.2.141.
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Abstract. One genus and six new species of ostracodes are described from the Bateque Formation on the Pacific Coast of Baja California Sur, Mexico. Planktonic foraminifers indicate a mid Eocene age and the whole assemblage is characteristic of a shallow warm-water environment. Paijenborchella mezquitalensis sp. nov. is the second record of the genus Paijenborchella from the Eocene of North America. Except for this species and the new genus Bajacythere, the ostracode association has strong affinities with those described from the lower Tertiary Gulf Coast region.
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Cronin, Thomas M., and Gary S. Dwyer. "Deep Sea Ostracodes and Climate Change." Paleontological Society Papers 9 (November 2003): 247–64. http://dx.doi.org/10.1017/s1089332600002230.
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Ostracodes are bivalved Crustacea whose fossil shells constitute the most abundant and diverse metazoan group preserved in sediment cores from deep and intermediate ocean water depths. The ecology, zoogeography, and shell chemistry of many ostracode taxa makes them useful for paleoceanographic research on topics ranging from deep ocean circulation, bottom-water temperature, ecological response to global climate change and many others. However, the application of ostracodes to the study of climate change has been hampered by a number of factors, including the misconception that they are rare or absent in deep-sea sediments and the lack of taxonomic and zoogeographic data. In recent years studies from the Atlantic, Pacific, and Arctic Oceans show that ostracodes are abundant enough for quantitative assemblage analysis and that the geochemistry of their shells can be a valuable tool for paleotemperature reconstruction. This paper presents practical guidelines for using ostracodes in investigations of climate-driven ocean variability and the ecological and evolutionary impacts of these changes.
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Morais, Anderson L. M. de, and João C. Coimbra. "On a new genus and species of Hemicytheridae (Ostracoda, Crustacea) from the southern Brazilian coast." Iheringia. Série Zoologia 104, no. 3 (September 2014): 367–72. http://dx.doi.org/10.1590/1678-476620141043367372.
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This study is based on 62 samples of phytal and bottom sediments collected along rocky beaches (< 3 m water depth) of the central and northern coasts of the state of Santa Catarina (26º10'/27º50'S – 48º26'/48º40'W), southern Brazil. Living and dead ostracodes distributed among 16 families were recovered. In this paper is emphasized one new hemicytherid genus and species that is described and richly illustrated: Auricythere sublitoralis gen. nov. and sp. nov. Some ecological and zoogeographical aspects of this new ostracode are briefly discussed.
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KORNICKER, LOUIS S., THOMAS M. ILIFFE, and ELIZABETH HARRISON-NELSON. "Ostracoda (Myodocopa) from Anchialine Caves and Ocean Blue Holes." Zootaxa 1565, no. 1 (August 31, 2007): 1–151. http://dx.doi.org/10.11646/zootaxa.1565.1.1.
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Eleven stygobitic myodocopid ostracodes (two new–Danielopolina palmeri and Spelaeoecia hox) in the Order Halocyprida are reported from anchialine waters in 11 inland blue holes in Bahamas. One stygobitic halocyprid ostracode is reported from two localities in Bermuda, and one from a cave in Mexico. A new subfamily, Spelaeoeciinae, is proposed to contain the genus Spelaeoecia, and the subfamily Deeveyinae is elevated to family status. Two new species of cladocopid ostracode (Pseudopolycope helix and Pontopolycope storthynx), are described from a cave in Mexico and an oceanic blue hole in the Bahamas. Nine species of myodocopid ostracodes (four new—Rutiderma flex, Eusarsiella syrinx, Eusarsiella fax, and Synasterope matrix) in the Suborder Myodocopina and one species in the Suborder Halocypridina are reported from ocean blue holes in the Bahamas. This is the first report of a halocyprid living in both an inland and ocean blue hole in the Bahamas. The sarsiellid genus Dantya Kornicker & Cohen 1978 is reported for the first time in the Bahamas, but the single juvenile specimen is left in open nomenclature as Dantya sp. A. The development of Deeveya bransoni and Eusarsiella syrinx is described in detail. With the exception of one species of Danielopolina from deep waters of the South Atlantic, all other species of Danielopolina, Spelaeoecia and Deeveya have been previously found only in inland, anchialine caves. The discovery of Deeveya inhabiting deeper, hydrologically-isolated waters in ocean blue holes, which are otherwise comparable to classical anchialine environments, has raised questions concerning the geographic limits to the anchialine habitat and its supposed reliance on terrestrial inputs.
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Braun, Willi K. "Modes of extinction in two Devonian ostracode faunas of western Canada." Canadian Journal of Earth Sciences 38, no. 2 (February 1, 2001): 173–85. http://dx.doi.org/10.1139/e00-084.
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The development of a prominent Middle Devonian Eifelian and an Upper Devonian Frasnian ostracode faunal sequence of western Canada is used to trace their evolutionary pathways, to illustrate evolutionary dynamics, and to evaluate the most probable causes and implications of the major and minor changes, which are clearly expressed in two sets of charts. A connection between sedimentary transgressiveregressive and evolutionary cycles is evident and documented in sample-for-sample accounts. Major changes in sea level were the primary cause for the most obvious breaks and trends in the faunal sequences and were responsible for the cyclic development of both the sedimentary and ostracode records. In contrast, numerous subordinate faunal breaks impart a distinctly punctuated pattern to both extinction and speciation pathways. Their regular spacing point to rhythmic influences that are interpreted to reflect primarily temperature fluctuations to which ostracodes are known to react in direct and indirect ways. In turn, the periodicity of the changes falls within the time frame of the Milankovitch Effect or to any one, or a combination, of its three variables. By combining the overall cyclic development with the punctuated progression of both extinction and speciation events in an "event-stratigraphic chart," a blueprint of the evolutionary dynamics emerges, which can be directly applied in sequence-stratigraphic reconstructions.
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Puckett, T. Markham. "Paleogeographic significance of muscle scars in global populations of Late Cretaceous ostracodes." Micropaleontology 58, no. 3 (2012): 259–71. http://dx.doi.org/10.47894/mpal.58.3.03.
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Ostracodes are among the most useful groups of fossils for applications in paleogeography and plate tectonics, mainly because of their provincial distributions. Analyses by many workers of the distributions of some groups of ostracodes, typically cytherocopine taxa at the generic level, demonstrate that shallow marine ostracode faunas may differ markedly in coeval deposits, even within short geographic distances. These analyses indicate that many shallow marine taxa are unable to cross deep water barriers. An intimate relationship exists, therefore, between plate tectonics and biological evolution. This relationship can reveal clues not only about evolving plate tectonic configurations, but also about the phylogenetic relationships among taxa and the resulting taxonomy. This study focuses on Late Cretaceous shallow marine ostracode genera. Whereas many of these genera are restricted paleogeographically, several, for example Brachycythere, Veenia, Curfsina, Mosaeleberis and Aysegulina (known formerly as Limburgina; see Özdikmen (2010)) among others, are reported to occur on widely separated continents in spite of widely recognized faunal barriers. Brachycythere and Curfsina have been described from such widely separate localities as North America, Europe, India and Australia; yet despite their external similarity, the muscle scar patterns from each geographic region show systematic differences. Although soft parts are rarely preserved, the muscle scar pattern is determined by the configuration of the soft part morphology and is thus of great phylogenetic and taxonomic value. These geographic and phylogenetic patterns indicate at least two possibilities: either there was convergent evolution of the exterior morphology or the exterior morphology is a plesiomorphic state, whereas the muscle scar patterns are apomorphic. In either case, recognition of these clades as discrete taxa contributes to their usefulness in paleogeographic and plate tectonic studies.
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Danielopol, Dan, Tonći Raða, and Tadeusz Namiotko. "Pseudocandona Sywulai Sp. Nov., a New Stygobitic Ostracode (Ostracoda, Candonidae) from Croatia." Crustaceana 77, no. 3 (2004): 311–31. http://dx.doi.org/10.1163/1568540041181501.
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Puckett, T. Markham. "Santonian-Maastrichtian planktonic foraminiferal and ostracode biostratigraphy of the northern Gulf Coastal Plain, USA." Stratigraphy 2, no. 2 (2005): 117–46. http://dx.doi.org/10.29041/strat.02.2.02.
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The Santonian-Maastrichtian deposits of the northern Gulf Coastal Plain of the United States (Mississippi-Alabama) are richly fossiliferous and structurally uncomplicated, offering an excellent setting in which to study calcareous microfossil biostratigraphy. Eight planktonic foraminiferal zones and seven ostracode zones are recognized in these strata, based on the stratigraphic occurrence of 45 species of planktonic foraminifera and 112 taxa of ostracodes. The planktonic foraminiferal zonation is based on standard global biozones. These include the Dicarinella asymetrica Taxon Range Zone, the Globotruncanita elevata Interval Zone, the Globotruncana ventricosa Interval Zone, the Globotruncanita calcarata Taxon Range Zone, the Globotruncanella havanensis Interval Zone, the Globotruncana aegyptiaca Interval Zone, the Gansserina gansseri Interval Zone, and the Contusotruncana contusa-Racemiguembelina fructicosa Interval Zone. Three new ostracode zones are defined, and the upper boundary of two previously defined zones are amended. These zones are the Veenia quadrialira Interval Zone (amended), the Acuminobrachycythere acuminata Interval Zone (new), the Brachycythere pyriforma Interval Zone (new), the Ascetoleberis plummeri Taxon Range Zone (amended), the Curfsina communis Interval Zone (new), the Escharacytheridea pinochii Interval Zone, and the Platycosta lixula Interval Zone. The planktonic foraminiferal biostratigraphy indicates that the age of these deposits range from early Santonian to early Maastrichtian. The Santonian-Campanian boundary is recognized on the basis of the highest occurrence surface of Dicarinella asymetrica, and demonstrates that the contact between the Tombigbee Sand Member of the Eutaw Formation and the Mooreville Chalk is diachronous. The Campanian-Maastrichtian boundary cannot be defined by calcareous microfossils due to the lack of a proxy for the newly established definition. The high-resolution biostratigraphy of the ostracodes, which are indigenous to the North American Coastal Plain, will enable subsequent studies of Late Cretaceous paleobiogeography and Gulf of Mexico-Caribbean tectonic development to be conducted.
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Cronin, Thomas M. "Late Pleistocene marginal marine ostracodes from the southeastern Atlantic coastal plain and their paleoenvironmental implications." Géographie physique et Quaternaire 33, no. 2 (December 9, 2010): 121–73. http://dx.doi.org/10.7202/1000066ar.
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Upper Pleistocene deposits from 21 localities in Maryland, Virginia, South Carolina, North Carolina, and northern Florida yielded 77 ostracode species; virtually all are living today in brackish and marine water. Five late Pleistocene ostracode biofacies signifying lagoonal, oyster bank, estuarine, open sound, and inner sublittoral environments were delineated using Principal Coordinate Analysis. During the late Pleistocene, the Lagoonal and Oyster Bank Biofacies predominated in the Chesapeake Bay area, whereas east-central North Carolina was characterized by an Open Sound Biofacies similar to that in Pamlico Sound today. The Inner Sublittoral Biofacies was present in southeastern Virginia and along the South Carolina coast. The Estuarine Biofacies was found only in the Chesapeake Bay region. Paleoclimates were inferred by a comparison of Holocene and late Pleistocene ostracode zoogeography; apparently the climate during the late Pleistocene was as warm as, and in some areas warmer than at the same latitudes today. Ostracode species are illustrated by scanning electron photomicrographs Cyprideis margarita, Neocaudites atlan-tica, and Microcytherura norfolkensis are described as new species.
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Altinsaçli, Selçuk, Ferda Perçin Paçal, and Songül Altinsaçli. "ASSESSMENTS OF ENVIRONMENTAL VARIABLES AFFECTING THE SPATIOTEMPORAL DISTRIBUTION AND HABITAT PREFERENCES OF LIVING OSTRACODA (CRUSTACEA) SPECIES IN THE ENEZ LAGOON COMPLEX (ENEZ-EVROS DELTA, TURKEY)." Ecologica Montenegrina 19 (December 14, 2018): 130–51. http://dx.doi.org/10.37828/em.2018.19.14.
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The present study analyzed the spatiotemporal changes of Ostracoda fauna in eight coastal lagoons in the Enez-Evros delta (Tuzla Lake 1, Tuzla Lake 2, Tuzla Lake 3, Taz, Işık, Dalyan, Kuvalak, and Taşaltı), located along the northern Aegean Sea coastline of Turkey. Recent ostracod samples collected from the eight lagoons were analyzed, and 16 living ostracod species (belonging to 14 genera) were identified during the sampling periods. The most abundant species were found to be Cyprideis torosa and Loxoconcha elliptica. C. torosa, a cosmopolitan and opportunistic species of Ostracoda, was found in all the studied coastal lagoons. All ostracod species determined in the lagoons were grouped into three assemblages: Group 1: halophilic continental freshwater species (F. fabaeformis, C. vidua, D. stevensoni, E. virens, H. salina, I. biplicata, I. bradyi, L. inopinata, and S. aculeata); Group 2: euryhaline and typical brackish water species (C. torosa and L. elliptica); Group 3: marine (coastal: A. convexa, L. rhomboidea, C. elongata, and X. communis) and brackish (lagoonal: L. lacertosa) water species. These species of Ostracoda were shown to be affected by environmental conditions. Analyses with the physicochemical variables and species (Spearman’s rank correlation coefficient and Canonical Correspondence Analysis) confirmed that ostracod distribution in the Enez lagoons are controlled by seawater–freshwater inputs and by salinity. The purpose of this work is about to present data about of the Enez lagoons, and analyze the diversity of ostracods of them.
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Forester, Richard M. "OSTRACODE ASSEMBLAGES FROM SPRINGS IN THE WESTERN UNITED STATES: IMPLICATIONS FOR PALEOHYDROLOGY." Memoirs of the Entomological Society of Canada 123, S155 (1991): 181–201. http://dx.doi.org/10.4039/entm123155181-1.
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AbstractOstracodes are a diverse group of marine and continental crustaceans that have radiated into virtually all oxygenated aquatic environments that persist for more than about a month. Continental ostracodes live in both surface water and groundwater.Ostracodes living in springs and seeps have typically been the subject of systematic rather than ecologic studies. These taxa may or may not occur in other surface-water bodies. Similarly, lacustrine taxa may or may not be found in springs. Spring taxa occurring in other surface waters are often found in ponds, marshes, streams, or on the edges of lakes where groundwater discharge is important. Groundwater discharge, unlike lake water, shows limited and predictable variability in chemistry and temperature during the year. That level of variability relative to lake water may define particular ostracode environmental gradients. The gradients would range from stable, high-volume discharge springs occupied principally by spring species to high variability lakes occupied largely by lacustrine species.Ostracode occurrences may also be described by parameters such as temperature, solute (dissolved ion) composition, solute concentration (salinity, conductivity, ionic strength), and calcite saturation indices. A plot of these parameters associated with the presence of a taxon illustrates its physiologic response to the environment, a field. Three general fields bounded by chemical parameters are delineated by existing data. Those fields are as follows: (1) a restricted range and (2) a full range of fresh water, and (3) both fresh and saline water. Fields bounded by temperature and chemistry are also recognized. The fields also offer a way of describing ostracode occurrences in terms of hydrogeology and climate.If ostracode occurrences are limited by major chemical and physical properties of the aquatic environment, then their habitat may be defined by certain physical–chemical principles. The same physical–chemical principles must apply to the past. The ecology of extinct taxa may, therefore, be defined in the same environmental terms as those for extant taxa.
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Schallreuter, Roger, Jacques Verniers, and Peter de Geest. "An Ordovician ostracode from Belgium." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 2000, no. 9 (September 16, 2000): 570–76. http://dx.doi.org/10.1127/njgpm/2000/2000/570.
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Hajek-Tadesse, Valentina, and Božo Prtoljan. "Badenian Ostracoda from the Pokupsko area (Banovina, Croatia)." Geologica Carpathica 62, no. 5 (October 1, 2011): 447–61. http://dx.doi.org/10.2478/v10096-011-0032-9.
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Badenian Ostracoda from the Pokupsko area (Banovina, Croatia)In this paper we present the results of the investigations on the Badenian (Middle Miocene) ostracods from the Pokupsko area. For the first time the presence of Badenian aged sediments in Croatia can be supported by the occurrence of ostracod biozonal markers. Four Badenian ostracod zones are established: Lower Badenian Biozone NO7Acanthocythereis hystrix-Bythocypris lucida, Middle Badenian Biozone NO8Eocytheropteron inflatum-Olimfalunia spinulosa, and the two Upper Badenian Biozones NO9Neomonoceratina laskarevi-Miocyprideis sarmatica elongataand NO10Carinocythereis carinata-Phlyctenophora farkasi.On the basis of the generally accepted paleoecology of selected genera, we identified the following ostracod faunas: shallow-water marine, shallow-water brackish-marine, shallow-water reef, and deep-water marine. The paleontological and trace element analyses suggest that the Pokupsko ostracod fauna lived in shallow (50 m deep), warm, and limpid waters, connected to a deeper sea and occasionally exposed to freshwater inflows.
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Horne, David J. "Key Events in the Ecological Radiation of the Ostracoda." Paleontological Society Papers 9 (November 2003): 181–202. http://dx.doi.org/10.1017/s1089332600002205.
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Ostracodes are ecologically diverse at the present day, inhabiting marine, nonmarine and (semi)terrestrial environments. Modern benthic faunas are dominated by Podocopa (marine and nonmarine Podocopida, marine Platycopida, and extremely rare marine Palaeocopida), while the Myodocopa (Myodocopida and Halocyprida) are diverse in the marine pelagic realm, as well as having many nektobenthic taxa. Their excellent fossil record facilitates reconstructions of their phylogenetic relationships and ecological adaptations throughout their Phanerozoic history. The earliest known ostracodes are of Ordovician age, when representatives of the extant orders Podocopida, Platycopida and Palaeocopida were already present, together with (possible) early Myodocopa and extinct orders such as the Leperditicopida. Cambrian bivalved arthropods such as bradoriids and phosphatocopids are no longer regarded as Ostracoda.Ordovician ostracodes were predominantly marine meiobenthos, diversifying into depth-related assemblages dominated by palaeocopids. The beginnings of podocopan radiations in marginal marine environments (brackish and hypersaline waters) are seen in the Silurian, as is an ecological shift of nektobenthic myodocopans to form the first pelagic ostracode faunas. Of the diverse marine Paleozoic palaeocopids, only a single lineage, the puncioids, survived beyond the Permian and today live interstitially in high-energy shallow marine environments. Post-Paleozoic marine benthic ostracode faunas are dominated by cytheroidean podocopids which gave rise to several radiations in the Mesozoic and Cenozoic. The healdiid metacopines (podocopans), of Devonian origins, enjoyed a marine radiation in the Triassic and Early Jurassic and then became extinct. Marine platycopids were also significant components of Mesozoic marine faunas and are relatively diverse in warm, shallow carbonate environments today.Suggestions that the first freshwater ostracodes were Devonian leperditicopids are controversial; undoubted nonmarine / freshwater radiations developed during the Early Carboniferous, including darwinuloidean and carbonitoidean podocopids and possibly some platycopids, together with cytheroidean podocopids (limnocytherids) in the Late Carboniferous. Of these only the darwinuloideans and limnocytherids survived the end-Permian extinctions and are still found in modern nonmarine waters; however, the dominant freshwater ostracodes today are the cypridoidean podocopids, whose radiation began in the Triassic and attained explosive proportions in the Late Jurassic - Early Cretaceous (although there are controversial suggestions of Paleozoic origins for this group). In addition to the limnocytherids there have been several other, separate invasions of nonmarine waters by cytheroidean podocopids, notably the cytherideids and the commensal entocytherids. Radiations in damp terrestrial environments have been initiated by both marine and nonmarine groups, but such invasions lack a recognized fossil record; (semi)terrestrial cypridoideans and darwinuloideans may represent Late Mesozoic radiations, while the Terrestricytheroidea, with marine affinities, may be much older, possibly Late Paleozoic in origin.
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Cohen, Anne C., and James G. Morin. "Sexual Morphology, Reproduction and the Evolution of Bioluminescence in Ostracoda." Paleontological Society Papers 9 (November 2003): 37–70. http://dx.doi.org/10.1017/s108933260000214x.
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A broad array of the highly variable morphological characters available in Ostracoda were used (1) to construct a new tabular key to the families of the subclass Myodocopa (and to differentiate the Myodocopa from the Podocopa), and (2) to explore the evolution of bioluminescence in the myodocopid family Cypridinidae. Results of a cladistic analysis of the Cypridinidae strongly support a single origin of bioluminescence within the family; a single clade contains at least 64 species known to luminesce (not all described). Furthermore, within that large clade, complex bioluminescent mating displays were confined by the analysis to a single clade of exclusively Caribbean cypridinids, though that result was unresolved by bootstrap analysis.Chemically different bioluminescence occurs convergently in two ostracode groups; it is produced within carapace glands of certain Halocypridina, but it is produced and extruded from the upper lips of many cypridinid Myodocopida and serves as an antipredatory behavior in both groups. Additionally at least 60 cypridinid species also produce spectacular and complex species-specific male mating displays nightly in the Caribbean Sea. The cladistic analysis using 58 morphological characters of 44 taxonomic units (24 described genera of Cypridinidae, 11 individual species assigned to the genus Vargula, six groups of bioluminescent signalling Caribbean species (many undescribed), the Cylindroleberididae, and the Philomedidae) was performed using PAUP with the parsimony criterion. Twenty-five of the characters were previously underutilized characters of the complex upper lip and large male copulatory limbs discovered through dissection and SEM. These proved especially valuable, but characters of all other limbs were also included.The Cypridinidae was confirmed as a monophyletic taxon with several well-supported subclades in addition to the large bioluminescent one. Skogsbergia, which apparently uses an antennular fan of iridescent blue filaments in courtship (Parker, 1997) belongs to a clade with five other cypridinid genera, including the four that have a similar fan. The genus Vargula was determined to be a polyphyletic assemblage. New genera will be established for former Vargula species including: “V.” tubulata, “V.” hilgendorfii, “V.” tsujii and all bioluminescent signaling species. Similar problems may exist for other large cypridinid genera, and clearer resolution of generic definitions might possibly reveal more significant patterns of geographic distribution within the family.Most characters of the carapace were found to be too convergent to be useful. Though carapace characters are diagnostic for some ostracode taxa, most should not be used by themselves to identify ostracodes with certainty. General aspects of reproduction are also reviewed.
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Lundin, Robert F., Mark Williams, and David J. Siveter. "Domatial dimorphism occurs in leperditellid and monotiopleurid ostracodes." Journal of Paleontology 69, no. 5 (September 1995): 886–96. http://dx.doi.org/10.1017/s0022336000035551.
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The discovery of domatial dimorphism in the leperditellid ostracode Loculocavata n. gen. and the monotiopleurid Primitiella minima (Harris), and the possibility that Leperditella Ulrich exhibits domatial dimorphism, requires a revision of the concept and/or diagnosis of the Platycopina. Domatial dimorphism is manifested by a special domiciliar space for egg/brood care in females. Domatia are represented by a loculate domiciliar wall or by a more generalized space bounded anteriorly by an interior partition caused by thickening or folding (sulcation) of the shell wall. Domatial dimorphism occurs in morphologically diverse ostracodes as shown by the podocopine Mesocyprideis, kloedenellids, cytherellids, monotiopleurids, the leperditellid Loculocavata n. gen., and by its possible occurrence in Hypotetragona and Leperditella. Changes in the present concept and/or diagnosis of the Platycopina are required to account for the above. Possible classifications range from restricting the Platycopina to holosolenic ostracodes with R/L overlap and domatial dimorphism to including within the Platycopina all groups that exhibit domatial dimorphism. The position of adductor muscle attachment in Loculocavata n. gen. and Primitiella minima (Harris) suggests that L2 may be the external expression of the position of adductor muscle attachment in some ostracodes.
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PINTO, RICARDO L., CARLOS E. F. ROCHA, and KOEN MARTENS. "On the first terrestrial ostracod of the Superfamily Cytheroidea (Crustacea, Ostracoda): description of Intrepidocythere ibipora n. gen. n. sp. from forest leaf litter in São Paulo State, Brazil." Zootaxa 1828, no. 1 (July 23, 2008): 29. http://dx.doi.org/10.11646/zootaxa.1828.1.3.
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Of the three superfamilies of Ostracoda present in fresh water, only the Cytheroidea had thus far no records in terrestrial environments. Here, we report on a new genus and species, Intrepidocythere ibipora n. gen. n. sp., of the ostracod superfamily Cytheroidea, from forest leaf litter in São Paulo State, Brazil. Judging from morphological similarities, this new genus is believed to be closely related to the genus Elpidium. Possible pathways that led to the colonisation of terrestrial habitats are discussed, and an overview is given on the distribution of the known terrestrial ostracod lineages. The present findings strengthen the idea that terrestrial ostracods are more common than previously thought, at least in tropical areas.
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Kovalenko, V. A. "CRITERIA FOR RECOGNIZING THE BOUNDARIES OF STRATIGRAPHIC DIVISIONS OF THE SOUTHERN MEOTIC REGION OF UKRAINE FOR OSTRACODS." Odesa National University Herald. Geography and Geology 28, no. 1(42) (August 10, 2023): 117–30. http://dx.doi.org/10.18524/2303-9914.2023.1(42).282242.
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Problem Statement and Purpose. Generalized results obtained in the implementation of the state topic IV‑1–18: «justification of the boundaries of regional and local stratigraphic divisions of the Phanerozoic of Ukraine for geological maps of the new generation» are. Criteria for recognizing the boundaries of stratigraphic divisions of the meшotic regioyarus of southern Ukraine by ostracods are established. Ostracod complexes were used to characterize the boundaries of stratigraphic divisions of the meotic region of southern Ukraine: ─ according to the leading species of ostracod (upper meotis ─ lower Pont); ─ by paleoecological characteristics of ostracod species (upper Sarmatian-lower meotis; lower-upper meotis). Data&Methods. Thus, complexes of meiotic ostracods were studied on the Kerch Peninsula: Yanysh-Takyl Mulda (Zavetne village), in the Crimea (Alminskа depression: Well. No. 302 (northern outskirts of Rivnopollye village), in the Black Sea depression: (Berezneguvate village (Mykolaiv region). When stratifying various deposits of the meotic regioyarus, it is very important to know the maximum possibility of practical use of ostracod complexes. Stratigraphic resolution of deposits of the meotic regioyarus of southern Ukraine by ostracod complexes-regiopidyarus, i.e. ostracods allow us to distinguish the lower meotic and upper meotic regiopidyarus. Thus, meotic ostracods allow us to distinguish two ostracod complexes in the lower meotic region-complex No. 1 (lower) and complex No. 2 (middle), and in the upper meotic region-complex No. 3. Results. The border between the upper Sarmatian and lower Meotic regions (complex No. 1 (lower)) is distinguished by paleoecological characteristics of ostracod species: Lower meotic region-complex (complex No. 1 (lower)): as noted earlier (Kovalenko, 2001), study of the species composition of lower meotic ostracods of complex No. 1 (Kerch Peninsula. The southern wing of the Yanysh-Takyl Mulda (Zavetne village)) gave grounds to assert that at that time there was a basin in the studied area that was very close in its bionomic conditions to the Kherson (upper Sarmat) one. The late Sarmatian ostracod fauna inherited by this early meotic Basin did not undergo significant changes, and the late Sarmatian ostracods Loxoconcha rimopora Suzin continued to exist; Euxinocythere suljakensis Suzin; Xestoleberis (Xestoleberis) maeotica Suzin; X. (X.) advena Schneider; X. (X.) goretski Golovko; X. (X.) irregularis Schneider and others. However, the appearance of meotic ostracodes, such as Loxoconcha obsoleta Ljuljev and Euxinocythere retituberculata Suzin, allows us to date these deposits to early meotis. The boundary between the lower meotic (complex No. 2) and upper meotic (complex No. 3) regions is distinguished by the paleoecological characteristics of ostracod species. For the first time for the Kerch Peninsula, the appearance of brackish ostracods of the Pontic type (Second migration wave) (Caspiocypris candida (Livental); Tyrrhenocythere pontica (Livental in Agalarova et al.), juv; Euxinocythere (Maeotocythere) praebacuana (Livental); Loxocorniculina diaffarovi Schneider, Loxoconcha praemitridata Agalarova, Camptocypria acronasuta (Livental). The boundary between the upper meotic (complex No. 3) and lower Pontic (complex No. 1) regions is recognized by the leading ostracod species (appearance of the Pontic type of ostracod fauna-genera Loxocorniculina Krstic, 1972; Camptocypria Zalanyi, 1959; Bacunella Schneider, 1958; Pontoniella Mandelstam, 1956; Caspiocypris Mandelstam, 1956 and others.
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Coimbra, João C., Silvia R. Bottezini, and Cláudia P. Machado. "Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus." Iheringia. Série Zoologia 103, no. 3 (September 2013): 289–301. http://dx.doi.org/10.1590/s0073-47212013000300012.
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The present study is a further contribution to the systematic knowledge of the shallow water marine ostracodes from the Brazilian oceanic islands. A total of 14 species belonging to 10 genera and eight families is herein identified. One new genus and species are described and illustrated: Berguecythere insularis gen. nov., sp. nov. In addition to this new taxon, the abundant species Loxocorniculum tricornatum Krutak, 1971, widely distributed in recent sediments in the Gulf of Mexico, Caribbean, north and northeast of Brazil and the Rocas Atoll, along with the cosmopolitan tropical ostracode Triebelina sertata Triebel, 1948, were also identified at specific level. The remaining 11 species were left at the genus level, and should provide new species. Ecological, zoo- and paleozoogeographical aspects were also briefly discussed.