Dissertations / Theses on the topic 'Brachiopoda'
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Craig, Robert S. "Western Australian Late Cretaceous and Cenozoic brachiopoda." Thesis, Curtin University, 1999. http://hdl.handle.net/20.500.11937/2320.
Full textCraig, Robert S. "Western Australian Late Cretaceous and Cenozoic brachiopoda." Curtin University of Technology, School of Applied Geology, 1999. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=12043.
Full textgenera from the Middle Miocene deposits of the South Shetland Islands Antarctica are common to New Zealand. Nine genera, identified from the La Meseta Formation, Seymour Island, Antarctic Peninsula, are also common to New Zealand. These genera are also found in Australia. This evidence has led to the proposal that in the Late Cretaceous there was a common shelf environment from the Antarctic Peninsula to the north-west coast of Western Australia. In this area, which formed the high latitude southern circum-Indo-Atlantic faunal province, brachiopods evolved different genera and species than those in the northern hemisphere. Many then dispersed into northern areas of the Indian, Atlantic and finally Pacific Oceans.When the material from the Middle to Late Eocene of the Bremer and Eucla Basin was examined, five genera were found to be common to the Early Tertiary of the Carnarvon Basin. When comparing the species from the south-western basins and those from the south- east it was evident that similar species occur in the Middle to Late Eocene of the Bremer, Eucla, St Vincent and Murray Basins. There are some fifteen species in common. Many of these species then occur in the Late Oligocene south-eastern basins near Victoria and Tasmania as the gap between the Australia mainland and Tasmania began to open. One species that occurs in the Late Eocene of Western Australia is also described from the Late Oligocene of New Zealand.In considering the distribution of the Cenozoic brachiopods, genera first appear in the north-west of Western Australia and they then appear in chronological order in the south-western basins and south-eastern basins of South Australia, then the south-eastern basins of Victoria and Tasmania and then New Zealand. By the Late Eocene, there was a shallow marine connection between the Bight and the Tasman Sea. By the Late Oligocene this had widened and ++
Australia was finally totally separated from Antarctica.The Proto-Leeuwin Current was responsible for the distribution of the brachiopods from the north-west of Western Australia to the southern coast. Possible mechanisms for the distribution of genera to New Zealand include rafting and an extended larval stage.It has been suggested that brachiopods in Australia are distributed according to the substrate on which they settle rather than any other factor. Using the information on the distribution of brachiopods in Western Australia throughout the Cenozoic this hypothesis is examined. It is suggested that avoidance of light in the photic zone and food availability with competition with bivalves are more important factors than substrate conditions.
Swisher, Robert E. "Paleobiogeographical and evolutionary analysis of Late Ordovician, C₅ sequence brachiopod species, with special reference to Rhynchonellid taxa." Ohio : Ohio University, 2009. http://www.ohiolink.edu/etd/view.cgi?ohiou1245445583.
Full textLong, Sarah Louise. "Aspects of cementation in recent and fossil Brachiopoda." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246325.
Full textWelch, Delpfine Ellen. "Geographical variation and evolution in the Middle Devonian brachiopod, Mucrospirifer." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134118/.
Full textPérez-Huerta, Alberto. "Brachiopods and paleoecological studies in the Pennsylvanian of the Great Basin (U.S.A.) /." view abstract or download file of text, 2004. http://wwwlib.umi.com/cr/uoregon/fullcit?p3136420.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 394-419). Also available for download via the World Wide Web; free to University of Oregon users.
Walls, Bradley J. "Quantitative Paleobiogeography of Maysvillian (Late Ordovician) Brachiopod Species of the Cincinnati Arch: a Test of Niche Modeling Methods for Paleobiogeographic Reconstruction." Ohio : Ohio University, 2009. http://www.ohiolink.edu/etd/view.cgi?ohiou1243010764.
Full textMello, Luiz Henrique Cruz de. "Análise cladística dos Bouchardiinae Allan, 1940 (Brachiopoda, Terebratellidae): implicações sistemáticas e paleozoogeográficas." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/44/44136/tde-13112015-164901/.
Full textA cladistic investigation of Bouchardiinae (Brachiopoda, Terebratellidae) was carried out. These brachiopods are common in the Cenozoic fossil record of Argentina, Uruguay, Antarctica, New Zealand, Australia, as well as in the Brazilian shelf. The geological history of the group can be tracked back until de Cretaceous/Tertiary boundary. The main goal of present study was to verify the hypothesis that morphological analysis on internal/external features of extinct/extant brachiopod shells allow us to proceed a cladistics analysis for the group. In order to achieve this goal, the relationships and systematic of the Bouchardiinae (Family Terebratellidae) were evaluated, as well as the scope of their genera. The cladistics analysis involved the in-group taxa Bouchardia, Bouchardiella, Beobouchardia, Malleia, having Adnatida, Aliquantula, Anakinetica, Australiarcula, elderra, Magadina, Magadinella, Parakinetica, Pilkena, Pirothyris, Rhizothyris, as the out-group. A total of 22 taxa and 43 characters were evaluated. The cladogram used as work hypothesis (CI= 0,714; RI= 0,889; RC= 0,635) presented a well resolved topology with 2 distinct clades; one with all Bouchardiinae, being Malleia portlandica the basal taxon; the other presented all Anakineticinae, including Australiarcula artesiana. The only unresolved relationship was between Bouchardia rosea and Bouchardia transplatina, suggesting that both taxa are synonymous. Among the out-group taxa the basal position of Australiarcula artesiana is worthy to mention. The results allow us to consider that: a) the morphological analysis of internal/external features of extinct/extant brachiopod shells supply important morphological data for cladistics analysis; b) there are 2 distinct clades that are representative of the Bouchardiinae and Anakineticinae, the later including Australiarcula artersiana, bringing some new evidences on their systematic position; c) the status of the genera, while valid and distinct taxa was re-evaluated, and resulted on the proposition of the synonymy between Bouchardiella and Neobouchardia, favoring the former; d) Bouchardia rosea and Bouchardia transplatina did not share significant morphological differences to keep them as distinct taxa. Thus the synonymy in favor of Bouchardia rosea (Mawe), 1823 is proposed; e) the monophyletic status of Bouchardiinae was corroborated; f) 3 synapomorphies ever suggested by the literature were confirmed, as follow: posterior thickening of the shell, \"V\" shapped cardinal process, and incomplete brachidia; g) based on the topology the condition of Bouchardia rosea and Anakinetica cumingi as distinct taxa is reinforced. Thus, their morphological similarities are much more due to similar ecological pressures (or mode of life) than to their close relationships; h) the classification of bouchardiid brachiopods seems to combine the suggestions of RICHARDSON (1994) and BRUNTON (1996), validating the Subfamily Bouchardiinae, with Bouchardia, Bouchardiella, and Malleia; i) despite of the lack of stratigraphic record of part of bouchardiid history, the parallel evolution of 2 groups was identified; one presenting a short interval, restricted to Australia e New Zealand, and corresponding to Bouchardiella cretacea, Bouchardiella (Neobouchardia) minima e Malleia portlandica, and the other group corresponding to Bouchardiella patagonica, Bouchardiella jorgensis, and species of Bouchardia, with an almost continuous record since the Cretaceous. This group evolved around the Antarctic Peninsula and east coast of southern South America; j) in spite the general north migration pattern presented by species of Bouchardia, some intermediate steps could be recognized, specially the migration of Bouchardia towards the Tierra del Fuego coast (Argentina) and Antarctic Peninsula. Consequently, the previous pattern of continuous northward migration of bouchardiid species without the retention of previous locations is only partially supported by the current data.
Saxén, Sara. "Linguliform Brachiopods from the Middle Cambrian ‘Thick’ Stephen Formation at Odaray Mountain, Canadian Rocky Mountains." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256188.
Full textDetta arbete behandlar arterna Kyrshabaktella cf. tatjanae och Ceratreta hansi sp. nov. från den ’tjocka’ Stephenformationen. Tidigare har området ansetts vara väldigt art- och släktfattigt på linguliforma brachiopoder. Nya fynd av Caron m.fl. (2010, 2014) visar på att så inte är fallet, och de fynd som behandlas här styrker den bilden. Fynden kommer från ett kalkstenslager beläget ca 17 meter upp i sekvensen på den ’tjocka’ Stephenformationen. Lagret har visat sig vara väldigt rikt på fossil. Med hjälp av dessa exemplar av K. cf. tatjanae har diagnosen av familjen Kyrshabaktellidae kunnat ändras, från att inte ha haft några utsmyckningar alls på de vuxna skalen till att kunna ha bland annat grovt koncentriska ornament (s.k. filae). Detta arbete och dessa nya fynd ska sprida ytterligare ljus över området. Förhoppningen är att denna ska hjälpa till att ge ny kunskap om områdets paleoekologi samt arterna och släktenas geografiska utbredning.Fossilen har separerats från kalkstenen genom att låta stufferna dra i utspädd myrsyra några dagar, tills kalken är upplöst. Fossilen har belagts med en palladium-guld legering och fotograferats med hjälp av ett svepelektronmikroskop (SEM).Syftet med arbetet är att göra en taxonomisk beskrivning av nya exemplar av brachiopodfossil från Stephenformationen.
Alexander, Mannelqvist. "Paleontology and Sedimentology of the Alum Shale Formation at Björnberget, Västerbotten County, Sweden." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-296696.
Full textEn hitintills obeskriven lokal av Alunskifferformationen vid Björnberget, Västerbottens län, beskrivs här med fokus på paleontologi och sedimentologi. Två nya arter av brachiopoder (Acrotretida) upptäcktes. Tingitanella vilhelminia n. sp. utökar släktet med ytterligare en art och utökar även den geografiska distributionen av släktet till Sverige. Anabolotreta furcatus n. sp. är den första medlemmen av släktet som beskrivits från Sverige och utökar den stratigrafiska spännvidden till lägre mellersta Kambrium. A. furcatus har även en skalstruktur med förgrenande pelare som beskrivs för första gången. En trilobit upptäcktes vid lokalen, Acadoparadoxides torelli, vilket tyder på att exponeringarna vid Björnberget tillhör övre delen av superzonen Acadoparadoxides (Baltoparadoxides) oelandicus. Faunan är artfattig i jämförelse med vad som tidigare har beskrivits från Jämtland och reflekterar en depositionsmiljö på den yttre kontinentalsockeln med ett lågt inflöde av klastiska sediment. Den sedan tidigare kända lokalen vid Granberget, nära lokalen vid Björnberget, beskrivs häri med avseende på paleontologi och sedimentologi. Faunan vid Granberget kan utökas med två nya arter av agnostider, Hypagnostus lingula och Hypagnostus mammillatus, till att totalt innehålla sex arter av trilobiter. Depositionsmiljön påverkades periodvis av stormar som avsatte kalkstenslager bestående av skelettdelar. Alunskiffern har förlorat majoriteten av dessa strukturer under diagenes som annars återfinns i kalkstenskonkretionerna.
Cerri, Cássio Angelo Dalcin. "Revisão sistemática dos Brachiopoda (Calciata), da Formação Ponta Grossa, Devoniano, Bacia do Paraná, Brasil." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-30032015-151753/.
Full textA systematic analysis of the Brachiopoda (Calciata) from Ponta Grossa Formation, Devonian, Apucarana Sub-basin, Paraná Basin, Paraná State, Brazil, is presented. The Brachiopoda (Calciata) from Ponta Grossa Formation, Paraná Basin, Paraná State, Brazil, were initially studied by John Mason Clarke in 1913 and, since then, were not the object of proper systematic revision. Previous taphonomic studies about other groups from the same location suggest that many species described may correspond to taphonomic species. The objectives of this article were: a- to revise the systematic of the Brachiopoda (Calciata) of the Ponta Grossa Formation, Devonian, through morphological study of the available fossil material; b- to verify the diversity of Calciata brachiopods of this Formation, comparing it to works from the Ponta Grossa Formation in the State of Mato Grosso; c- to verify if any of the morphological characters used in the diagnosis of genera and species of Calciata brachiopods from Ponta Grossa Formation, Paraná State, are susceptible to taphonomic modification, particularly post-mortem compaction and exfoliation, as occurs in other fossil groups, like conulariids and trilobites. The results have shown that, of the species previously described, Australostrophia mesembria, Pleurochonetes falklandicus, Cryptonella baini and Australocoelia palmata are valid and remain unchanged; the species Coelospira (?) colona could only be identified up to a generic level due to lack of data on the samples analyzed. The genera Australospirifer, Schuchertella and Derbyina presented problems during their identification. Autralospirifer is considered a valid genus and possesses five described species for the Ponta Grossa x Formation, although the diagnostic characters that differentiate them are susceptible to taphonomic modification, fact evidenced in analyzed samples, with them also presenting high variability degree, which impedes the identification of those species. Two species of Schuchertella are described to the Ponta Grossa Formation, a genus that has undergone taxonomic revision, excluding those species from the generic classification. Those species may belong in the Floweria genus, but the lack of data on the samples makes impossible the validation of this hypothesis. Derbyina is a controversial genus, very similar to the genus Paranaia, which recent revisions claim to be different from each other. Due to the lack of data in the examined material, specifically the brachidium, it was not possible to confirm the distinction between these genera, as well as specific identification. The present work has strengthened the idea that the designation of new species must be made in face of a considerable number of samples, so that the largest spectrum of taphonomic and morphological variations resulting from the fossilization process is identified, which diminishes the error margin. Therefore, it is important to combine taphonomy with the systematic study, in order to identify characters which are subject to greater taphonomic variation.
Torello, Fernanda de Freitas. "Tafonomia experimental do fóssil vivo Bouchardia rosea (Brachiopoda, Terebratellidae) e suas aplicações em paleontologia." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/44/44136/tde-11112015-151000/.
Full textThe taphonomic tumbling barrel, used in Experimental Taphonomy, simulate high energy conditions (e. g., abrasion) that operate in some environments. In this study, it was used a steel barrel, with internal shelves, 15 centimeters diameter, and 60rpm of velocity. Ten specimens were used as sample size for each experiment and replicates. All experiments were evaluated by statistical methods. The main goal of this study was the investigation of differential preservation and post-mortem destruction of calcitic brachiopod shells (Bouchardia rosea, Terebratellidae) and bivalve mollusks (Veneridae, Pectinidae, Mytilidae and Pinnidae). Bouchardia rosea shells are taphonomically important because their composition and microstructures that are similar within Paleozoic members of rhynchonellids and terebratuliids, as well as a free lying mode of life. The obtained results have implications in our understandings of decay processes that act over the bioclasts and contribute to the bias of the fossil record (the primary source of paleobiological and evolutionary data). The main obtained results are: a) the organic and mineralogical composition and the shell form would not represent the main factor associated to the mass decay behavior, being extrinsic factors probably responsible to the differential loss of mass; b) ventral and dorsal Bouchardia rosea valves present similar values for the mass decay, leading to the believe that the abrasion resistance is not the main factor controlling the bias between ventral and dorsal valves in the modern accumulation and fossil concentrations; c) small valves of Bouchardia rosa (~1 cm) have distinct behavior in decay of mass when compared to medium (~1.4cm) and large shells (~1,8cm), that have similar decay behavior, probably due to density differences; d) incrusted, bioeroded and fresh valves have different mass decay behavior. It probabily indicate that bioeroded and incrusted elements do not necessarily increase or decrease the valve abrasion resistance. By complementing the obtained laboratory results with field observations both the depositional history and the spatial and temporal resolution of a given brachiopod-rich fossil concentration will be better understood.
Chen, Zhong Qiang, and mikewood@deakin edu au. "Late palaeozoic sequence stratigraphy and brachiopod faunas of the Tarim Basin, Northwest China." Deakin University. School of Ecology and Environment, 2001. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050915.141146.
Full textWang, Haizhou. "Origin and Lifestyles of early Brachiopods and other Lophotrochozoans : Insights from the Chengjiang and Guanshan Fossil-Lagerstätten." Doctoral thesis, Uppsala universitet, Paleobiologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-234843.
Full textDudei, Nicole L. "The impact of the Richmondian Invasion on paleobiogeographic distribution of taxa in the Late Ordovician C₄ sequence (Richmondian Stage, Cincinnati, Ohio) including a comparison of range reconstruction methods." Ohio : Ohio University, 2009. http://www.ohiolink.edu/etd/view.cgi?ohiou1245437297.
Full textOstrow, D. Gigi, and n/a. "Larval dispersal and population genetic structure of brachiopods in the New Zealand fiords." University of Otago. Department of Marine Science, 2007. http://adt.otago.ac.nz./public/adt-NZDU20070308.144342.
Full textLayng, Alexander Patrick. "Two-dimensional landmark analysis of Spinocyrtid brachiopods of Euramerica during the Givetian." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5799.
Full textJaecks, Glenn Seward. "Investigating heterochrony in the fossil record : a geochemical, morphometric, and phylogenetic study of Thecideida (Brachiopoda), Triassic-recent /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.
Full textKlug, Christopher Allen. "Lower Permian through Lower Trassic [sic] paleontology, stratigraphy, and chemostratigraphy of the Bilk Creek Mountains of Humboldt County, Nevada." Bowling Green, Ohio : Bowling Green State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1184878826.
Full textRobert, Chloé. "Estimating the Early Evolution of Brachiopods Using an Integrated Approach Combining Genomics and Fossils." Thesis, Uppsala universitet, Paleobiologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-356883.
Full textDet är ofta antaget att evolution (förändringar i arvsmassan hos en grupp organismer) sker i en konstant hastighet men i slutändan ändå osäkert om så är fallet. Stora grupper av organismer har ofta associerats med en högre evolutionär hastighet, speciellt nära deras uppkomst, vilket ökar sannolikheten för överlevnad. Armfotingar (Brachiopoda) är marina ryggradslösa djur med skal som tidigare var allmänt spridd, idag är istället musslor (Bivalvia) betydligt mer spridda. Armfotingar har funnits och utvecklats under flera miljoner år med ursprung under tidigt kambrium. Genom år av forskning och många fossil har vi fått mer information om utseendet hos utdöda organismer vilket har bidragit till att antalet fossila arter som vi känner till har ökat tusenfalt. Under den senaste tiden har det också skett innovationer inom molekylära tekniker som gjort det möjligt att applicera dessa kunskaper även på utdöda arter. Dessa molekylära tekniker har nyligen hjälpt till att bestämma några av släktskapsförhållandena inom armfotingar som tidigare ansetts vara väldigt svåra att lösa. Det finns fortfarande vissa släktskapsförhållanden inom armfotingar som inte är kända och man vet ännu inte hur fort de utvecklades. Genom att undersöka just evolutionens hastighet kan man börja förstå gruppens tidiga framgång under Kambrium och Ordovicium samt minskningen som följde. Syftet med den här studien var att beräkna evolutionshastigheten hos armfotingar med särskild fokus på den tidiga diversifieringen av gruppen. För att undersöka detta använde vi oss av molekylära data för att analysera släktskapsförhållandena inom armfotingar. Dessutom använde vi fossil för att datera stora händelser i armfotingarnas evolutionära historia. Med hjälp av statistiska analyser kunde vi beräkna evolutionshastighet och släktskapsförhållandena inom gruppen. Vi kom fram till att armfotingar härstammar från en gemensam förfader. Dateringen kring när detta skedde blev inte fastställd då det beräknades ske miljoner år före det äldsta djurfossilet. Det kommer behövas mer forskning för att ta reda på om armfotingar hade en högre evolutionär hastighet i tidigt skede.
Griškonytė, Ieva. "Minijos regioninio aukšto geocheminiai uolienų ir brachiopodų tyrimai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20090908_194022-85278.
Full textGEOCHEMISTRY OF ROCKS AND BRACHIOPODS OF MINIJA REGIONAL STAGE SUMMARY The so-called closeness/openness of carbonate system is still a big problem in predicting reservoir properties. Only when the systems are closed (or closed with respect to major elements) adequate prediction of diagenesis (e.g. dissolution, cementation) and the effect on porosity and permeability can be made. When systems would be closed, dissolution because of unstable or metastable primary mineralogical composition of grains (aragonite, high-Mg calcite) or because of grain size and texture (reactive surface area versus volume) would deliver the material for cementation (in fact cementation is thus merely the result of redistribution of carbonate within the system). Brachiopods precipitate low – Mg calcite shells and have a high potencial for retaining their primary chemical composition of palaeoseawater. The sample material in this study was cleaned brachiopod shells (Isorthis ovalis) and the associated whole rock carbonates. For the analysis we took 18 samples of rocks and brachiopods, from 11 different boreholes, which are located from West – Central to South part of Lithuania. Both, brachiopods and associated rocks samples were analysed for Ca, Mg, Fe, Mn and Sr and the results were compared in order to assess in how far carbonate material was added to the Silurian system during burial. The study of Ca, Mg, Fe, Mn and Sr chemical element contents suggests that in Central and South part of Lithuania... [to full text]
Egerquist, Eva. "Ordovician (Billingen and Volkhov stages) Brachiopod Faunas of the East Baltic." Doctoral thesis, Uppsala University, Palaeontology group, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4303.
Full textLower-Middle Ordovician (Arenig) successions in the East Baltic have been investigated for more than one hundred and fifty years. Nevertheless detailed sampling still yields new species and better knowledge of the environment in which these organisms lived. The successions are well suited for bed by bed sampling because of the lack of tectonic disturbance and because the sequences are well documented.
This study analyses collections of Billingen-Volkhov age mainly from the St. Petersburg region, but also from Estonia. A great deal of the material was obtained from the marly to clayey, soft sediment that intercalates the compact packstones and wackestones in the succession. Twenty-nine of these clay horizons were used for diversity estimates on the fauna through the succession. The most thoroughly investigated groups for this investigation were rhynchonelliformean brachiopods, conodonts and ostracodes. The results indicate that variances in diversity and abundance levels for these groups were not correlated, either to each other or to the small-scale sea level fluctuations that have been suggested for the region. However, diversity dynamics of brachiopods and ostracodes confirm the large-scale upward shallowing of the basin into the Upper Volkhov. Comparison with fossils from the limestones did not reveal any differences in faunal composition between the two preservation modes.
The detailed sampling, coupled with sampling of the recently described mud mounds that occur in several outcrops, yielded large numbers of specimens. This enabled revision of earlier poorly known rhynchonelliformean genera such as Ujukella Andreev, as well as better known genera such as Porambonites Pander. In total the examined faunas include 31 genera assigned to 53 species of rhynchonelliformean brachiopods. Of these Leoniorthis and Eoporambonites are defined as new genera, and the following new species are described: Neumania paucicostata, Ranorthis rotunda, Orthidium gambolovensis, Orthidium lavensis, Skenidioides minutus, Tetralobula peregrina, Idiostrophia prima and Idiostrophia tenuicostata.
Comniskey, Jeanninny Carla. "Paleontologia dos Discinidae (Brachiopoda: Linguliformea) da sucessão devoniana da Bacia do Paraná, Estado do Paraná, Brasil: Revisão sistemática, distribuição geográfica e estratigráfica." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2011. http://tede2.uepg.br/jspui/handle/prefix/543.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
The present paper is about branchiopods discinids that occur from the Devonian succession in the state of Paraná, Brazil. The following themes were discussed: systematic review, basic taphonomic analysis and a geographic distribution and stratigraphic. The fieldworks were developed with the intuition of collecting material with stratigraphic control. It was recorded four species of discinids: Orbiculoidea baini, Orbiculoidea bodenbenderi, Orbiculoidea excentrica e Gigadiscina collis. The discinids occur from the Neopraguiano until at least Eogivetiano. The stratigraphic and geographic distribution varies with the species. Considering about the extinction of the group, along with its collapse of the malvinokaffric fauna is also presented. The transference from Orbiculoidea collis taxon to Gigadiscina collis and its maintenance of the others species with originals descriptions added to new data are also presented.
O presente trabalho trata dos braquiópodes discinídeos ocorrentes na sucessão devoniana do estado do Paraná, Brasil. Foram abordados os seguintes temas: revisão sistemática, análise tafonômica básica e distribuição geográfica e estratigráfica. Trabalhos de campo foram desenvolvidos no intuito de se coletar material com controle estratigráfico preciso. Registrou-se quatro espécies de discinídeos quais sejam: Orbiculoidea baini, Orbiculoidea bodenbenderi, Orbiculoidea excentrica e Gigadiscina collis. Os discinídeos ocorrem desde o Neopraguiano até pelo menos o Eogivetiano. A distribuição geográfica e estratigráfica varia de acordo com a espécie. Considerações sobre a extinção do grupo, juntamente com o colapso da fauna malvinocáfrica é ainda apresentado. A transferência do táxon Orbiculoidea collis para Gigadiscina collis e a manutenção das demais espécies com descrições originais adicionadas de novos dados são também apresentadas.
Butler, Aodhán D. "Decoding the fossil record of early lophophorates : Systematics and phylogeny of problematic Cambrian Lophotrochozoa." Doctoral thesis, Uppsala universitet, Paleobiologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-261907.
Full textBaxter, Mary Elizabeth. "A revised classification for certain genera of the families Uncinulidae, Hebetoechiidae, Obturamentellidae, Glossinotoechiidae, Hypothyridinidae and Hadrohynchiidae of the superfamily Uncinuloidea, order Rhynchonellida, phylum Brachiopoda /." view abstract or download file of text, 1999. http://wwwlib.umi.com/cr/uoregon/fullcit?p9955912.
Full text"Table 1," 216 cm. x 74 cm., folded to 26 cm. x 17 cm., in pocket of vol. 1. Typescript. Includes vita and abstract. Includes bibliographical references (leaves 548-568). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9955912.
Anelli, Luiz Eduardo. "Invertebrados Neocarboníferos das formações Piauí (Bacia do Parnaíba) e Itaituba (Bacia do Amazonas): taxonomia; análise cladística das subfamílias oriocrassatellinae (crassatellacea, bivalvia) e neospiriferinae (spiriferoidea, brachiopoda)." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/44/44136/tde-26072013-153442/.
Full textThe present thesis covers the systematic paleontology of the invertebrate fauna from the Piauí Formation (Late Carboniferous, Parnaíba Basin). Additionally, two brachiopods and one bivalve species, from the Itaituba Formation (Late Carboniferous, Amazon Basin) are also described. The invertebrate marine assemblage from the Piauí Formation is the second most diversified and abundant in the Brazilian Neopaleozoic. With the inclusion of the bilvalves studied by Anelli (1994, Master Dissertation), 51 species are recognized. Among the molluscans, the bivalves are the best represented group, including 30 species (58%), followed by nine species of gastropods (17%), and one of cephalopods (2%). The brachiopods, the second best group represented, include nine species (17%), attributed to the acrotretids (1 species), strophomenids (1 species), productids (5 species) and spiriferids (2 species). One species of trilobite and one of the bryozoa are also described in the Piauí assemblage. Among the 25 species from the Piauí Formation treated here, three species, Bellerophon (Pharkidonotus) sp. n. (gastropod), Pteronites sp. n. (bivalve) and the combination, Palladin plummeri n. comb. (trilobite), are new to science. Two new species of brachiopods, Neospirifer sp. n. 1, Neospirifer sp. n. 2 and a new bivalve, cf. Edmondia sp., are identified in the Itaituba Formation. The geological distribution of the recognized species indicates a Pennsylvanian age for the Piauí assemblage, corroborating the age determination based on conodonts (Atokan-Morrowan, including the lower part of the Desmoinesian) for the Piauí Formation and on conodonts and fusulinids for the Itaituba Formation. The faunas from the Piauí and Itaituba Formations show close taxonomic similarity, supporting the contemporaneity and probable geographic link between the two basins in the Middle Pennsylvanian. Other faunas showing close taxonomic similarities with the Brazilian ones are those from the American Mid-Continent, including faunas from the Amsden Formation, from Wyoming, and the Desmoinesian sequence of southeast Missouri. South American Pennsylvanian faunas showing affinities to the Piauí Formation include those of the Cerro Prieto Formation (Amotape Mountains, Peru) and the La Jagua Series and Palmarito Formation, Venezuela. In addition to the traditional taxonomic approach, this study also includes the cladistic analysis of some well-represented groups. Taxons analysed include the subfamily Oriocrassatellinae (Bivalve, Crassatellacea) and the Productidina and Spiriferoidea (Brachiopoda). Results of the analysis led to the recognition of problems related to the systematics of these groups. The unweighted analysis of the subfamily Oriocrassatellinae Boyd & Newell (1968) revealed the phylogenetic relationships of 16 species of the genus Oriocrassatella and identified two monophyletic groups, thus corroborating the paleogeographical reconstructions during the late Paleozoic. According to this analysis, part of the taxons of the superfamily Crassatellacea are not in agreement with the traditionally accepted systematics of the group. The weighted analysis, although not corroborating the paleogeographical groups, is consistent with the groupings of families and subfamilies of the Crassatellacea as traditionally understood. The cladistic analysis also helped in the identification of monophyletic and paraphyletic species. A preliminary analysis of the productids based on a list of characters presented in the literature was carried out to test the systematics of species from the Itaituba Formation as well as the preliminary systematics of the material from the Piauí Formation. The systematics previously proposed for the Itaituba productids only partially agrees with results of the cladistic analysis and needs revision. Specimens from the Piauí Formation, although preserved as moulds, show sufficient characters for grouping species into superfamilies. Cladistic analysis indicates that the subfamily Neospiriferinae is paraphyletic. Preliminary results for most of the taxons of the superfamily Spiriferoidea show the Trigonotretidae, as well as Neospiriferinae and Trigonotretinae, as paraphyletic groups. All specimens from the Itaituba Formation assigned by Mendes (1966) to Neospirifer dresseri may be polyspecific, as indicated in the cladograms.
Bassett-Butt, Lewis. "The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica." Licentiate thesis, Uppsala universitet, Paleobiologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-252137.
Full textGourvennec, Rémy. "Brachiopodes spiriferida du dévonien inferieur du massif armoricain : systématique, paléobiologie, évolution, biostratigraphie." Brest, 1987. http://www.theses.fr/1987BRES2033.
Full textSaulnier, Ségolène. "Exploration des compositions isotopiques en magnésium des carbonates marins comme traceurs paléoenvironnementaux." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0267/document.
Full textStudying the Mg isotopic composition in marine carbonate can help to understand the biogeochemical cycle of this element. Indeed, carbonates may record seawater Mg isotopic composition during their precipitation. However, it is necessary to understand the possible control of some environmental factors (e.g. temperature, pH, Mg/Ca of the solution) on those compositions. Therefore, the first goal of this thesis was to determine parameters impacting carbonate Mg isotopic composition with experimental precipitations under controlled conditions. Thus, it has been shown, in restricted ranges, that temperature, pH and solution Mg/Ca have no influence on Mg isotopic fractionation during calcite precipitation. Equilibrium Mg isotopic fractionation between solution and calcite has been evaluated to -2.13 ± 0.24 per thousand (2sigma) from this study, combined with published data. These results were then applied to a study of Mg isotopic compositions in modern and past brachiopod shells. For this, a quantification of vital effects with respect to Mg isotopes during the brachiopod growth was realized. The zones in isotopic equilibrium for Mg, O and C, and thus susceptible to be used for paleoenvironnemental reconstruction, are in the inner calcite at the edge of the shell. The first measurements of Mg isotopic compositions for the last 60 Ma suggest variations of Mg isotopic compositions of the seawater which could be linked to changes of carbonate flux in the ocean
Skovsted, Christian B. "The Early Cambrian Fauna of North-East Greenland." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3910.
Full textSmall shelly fossils are common in sediments of Early Cambrian age and include the earliest common representatives of metazoan animals with mineralized hard parts. The group includes fossils of very different morphology, composition and ultrastructure. They seem to represent skeletal remains of numerous animal groups, the biological affinities of which are largely unresolved. However, the wide geographic range of many forms has the potential to enhance biostratigraphic and palaeogeographic resolution in the Early Cambrian.
The late Early Cambrian sequence of North-East Greenland has yielded an assemblage of more than 88 species of small shelly fossils, brachiopods and trilobites, indicative of a middle Dyeran age (Botoman equivalent). The recovered fossils include a number of species that are known from other Early Cambrian palaeocontinents, and particularly strong ties to late Early Cambrian faunas of Australia are documented. The many cosmopolitan taxa thus identified suggests a close juxtaposition of palaeocontinents at this time.
The systematic affinity of many of these small shelly fossils is poorly understood, partly because of their fragmentary nature and poor preservation. However, new data from North-East Greenland improves our understanding of the function and biological affinity of certain taxa. Collections of the problematic fossil Mongolitubulus from North and North-East Greenland exhibit characters indicative of a defensive function as spines of bivalved arthropods, while species of the problematic genus Triplicatella represent the opercula of an unknown tubular shell, probably related to orthothecid hyoliths. The bivalved fossil Mickwitzia from North-East Greenland combines characters of linguliform brachiopods and sclerites of Micrina, a non-bivalved problematic form (halkieriid) from Australia. The combination suggests that Mickwitzia is a stem group brachiopod and strengthens arguments for a halkieriid ancestry of the brachiopod phylum.
Harper, D. A. T. "Diversification of the Ordovician brachiopod fauna." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426983.
Full textPiazza, Veronica. "Response of early Toarcian (Early Jurassic) benthic marine faunas from South-Western Europe to temperature-related stressors." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22950.
Full textGlobal warming, oceanic acidification and deoxygenation (temperature-related stressors) play an important role during climate change. The combined impact of these stressors is known to negatively affect marine biota and ecosystems, often exacerbating the impact of other stressors. Under the current and past climate change, there is record of altered species distribution, habitat loss, extinctions and decreased physiological performance of organisms. Despite the increasing evidence, the specific mechanisms through which climate change influences ecological patterns are debated. Past environmental perturbations represent an opportunity to investigate the dynamics of ecosystem and biotic crises across Earth history. This work integrates different disciplines to increase our understanding on the role played by temperature-related stressors on marine benthic biota and ecosystems. The Toarcian Event (Early Jurassic) was chosen for its well-preserved geological, geochemical and palaeontological record. High-resolution quantitative faunal and geochemical data from benthic marine macroinvertebrates were investigated. The aims are to identify and evaluate the mechanisms of faunal and ecological shifts under a temperature-related stressor scenario, with focus on body size patterns and ecosystem change and recovery, and to estimate the role of environmental stressors as proximate causes of the biotic crisis. Temperature increase led to biodiversity loss and reduced body size of organisms during and possibly before the event. Moreover, the structure of marine communities was reorganized in terms of taxonomic and ecological composition. The response to environmental stress was variable within and between taxonomical groups, with brachiopods severely affected. These findings increase our understanding of biotic responses and ecosystem and biodiversity shifts under temperature stress, hopefully contributing to the prediction of ecosystem changes under the current warming scenario.
Clegg, Heather. "Biomolecules in recent and fossil articulated brachiopods." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334162.
Full textEvangelisti, Francesca <1978>. "Mediterranean brachiopods: morphological, ecological and phylogenetic aspects." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2738/1/Evangelisti_Francesca_Tesi.pdf.
Full textEvangelisti, Francesca <1978>. "Mediterranean brachiopods: morphological, ecological and phylogenetic aspects." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2738/.
Full textMeidlinger, Karen. "Reproductive ecology of the Antarctic brachiopod Liothyrella uva." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242863.
Full textYE, FACHENG. "THE MICROSTRUCTURE OF MODERN AND FOSSIL BRACHIOPOD ARCHIVES." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/625022.
Full textJoubin, Louis. "Recherches sur l'anatomie des brachiopodes inarticulés." Paris : Bibliothèque universitaire Pierre et Marie Curie (BUPMC), 2009. http://jubil.upmc.fr/sdx/pl/toc.xsp?id=TH_000327_001&fmt=upmc&idtoc=TH_000327_001-pleadetoc&base=fa.
Full textStern, Benjamin. "Biomineral lipids in living and fossil molluscs." Thesis, University of Newcastle Upon Tyne, 1996. http://hdl.handle.net/10443/1713.
Full textAzmy, Karem. "Isotopic composition of Silurian brachiopods, implications for coeval seawater." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq20988.pdf.
Full textBrown, Karen E. "Bimineralisation of the calcitic-shelled, inarticulated brachiopod, Neocrania anomala." Thesis, University of Glasgow, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244444.
Full textMinkler, Heidi. "The brachiopod communities and systematic paleontology of Anticosti Island /." Columbus, Ohio : Ohio State University, 2003. http://hdl.handle.net/1811/6105.
Full textBornsäter, Mellbin Barbro. "Linguliform Brachiopods from the terminal Cambrain to lower Ordovician Tiñu section, Mexico." Thesis, Uppsala universitet, Paleobiologi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88918.
Full textThe Tiñu Formation of Oaxaca State (Mexico) is the only fossiliferous lower Palaeozoic unit between the Laurentian platform in northwest Mexico and the Gondwanan successions in Andean South America. It has recently been shown that the Tiñu section is a condensed passive margin succession with Gondwanan character. The formation is divided into two members, namely, the uppermost Cambrian Yudachica Member, which rests nonconformably on a middle Proterozoic basement, and the Lower Ordovician (Tremadoc) Río Salinas Member. The formation has been studied with respect to its depositional environments and its fossil content of trilobites and conodonts, both providing excellent biostratigraphical control for the formation. About 1000 specimens of Linguliform brachiopods of twelve limestone horizons of the Tiñu Formation have been studied. Detailed investigations on taxonomy and stratigraphic distribution of the taxa have been made. The fauna comprises nine acrotretid taxa, a new siphonotretid species and a few linguloid fragments. The acrotretid and siphonotretid taxa have been thoroughly describes and classified to genus.
Hoel, Ole Andreas. "Diversity and Life Habits of Silurian Strophomenide Brachiopods of Gotland." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4728.
Full textThe Superfamily Strophomenoidea is a very diverse group of brachiopods in the Early Palaeozoic. In the Silurian succession on Gotland, they are among the most easily identifiable, and commonly found fossils. However, there are few detailed studies of this group from Gotland, and no new strophomenide taxa have been described from this area since 1869. The life habits of strophomenides are also poorly understood, partly because their morphology differs greatly from that of living brachiopods.
The succession on Gotland yielded 27 species belonging to the Strophomenoidea, of which two species and two subspecies are new. The remaining species have been described earlier from Gotland or Great Britain. The most important group is the Leptaeninae, which occurs commonly throughout the entire succession on Gotland. Five species (one new), two new subspecies and two taxa treated under open nomenclature were found. Leptaena rhomboidalis and Lepidoleptaena poulseni were specialized for life in shallow water environments, retaining a large apical pedicle; the remaining leptaenines were ambitopic. The Furcitellininae is represented by three genera comprising six species, of which only one persisted into the Ludlow. All were ambitopic, except Pentlandina loveni, which was specialized for high-energy environments. Six species of “strophodontids” from Gotland, belonging to the Leptostrophidae, the Strophodontidae and the Shaleriidae, share a shallow-bodied, variably concavo-convex shell with costellate ornament. Mesoleptostrophia and Brachyprion (Brachyprion) were long-ranged and ecologically tolerant, while B. (Erinostrophia), Strophodonta and Shaleria had short ranges and were ecologically specialized. The two earliest known cementing strophomenides occur on Gotland, and their hitherto unknown dorsal valves have been identified: Liljevallia was found to belong to the Douvillinidae. The cementing Leptaenoidea silurica was found to be conspecific with the ambitopic Scamnomena rugata; it was able to live ambitopically if removed from the substrate. The thickened dorsal valves allow reconstruction of its lophophore.
Bose, Rituparna. "EPIBIONTS ON BRACHIOPODS FROM THE DEVONIAN DUNDEE FORMATION OF OHIO." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1155059386.
Full textTrubovitz, Sarah. "Reconstructing the Great Ordovician Biodiversification Event through brachiopods of Oklahoma." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1461943954.
Full textWinrow, Paul. "A review of Cambrian lingulate brachiopods of England and Wales." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/29417.
Full textVerna, V. "GUADALUPIAN BRACHIOPODS FROM TUNISIA AND TURKEY: SYSTEMATICS AND PALAEOBIOGEOGRAPHIC IMPLICATIONS." Doctoral thesis, Università degli Studi di Milano, 2011. http://hdl.handle.net/2434/152907.
Full textRodland, David Laurence. "Spatial variability in modern brachiopod assemblages: paleoecological and geochemical implications." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/27858.
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Botquelen, Arnaud Gourvennec Rémy Loi Alfredo. "Impact des variations eustatiques sur les assemblages benthiques à brachiopodes l'Ordovicien sarde et le Dévonien Ibéro-armoricain. Paléoécologie, Taphonomie, Statigraphie séquentielle, Systématique /." [S.l.] : [s.n.], 2003. http://tel.ccsd.cnrs.fr/docs/00/04/74/68/PDF/tel-00007779.pdf.
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