Увійти

Готові списки джерел за темами / Coleoids / Статті в журналах

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Coleoids.

Статті в журналах з теми "Coleoids"

Автор: Grafiati

Опубліковано: 5 березня 2024

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся з топ-50 статей у журналах для дослідження на тему "Coleoids".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Переглядайте статті в журналах для різних дисциплін та оформлюйте правильно вашу бібліографію.

1

Mapes, Royal H., and Larisa A. Doguzhaeva. "New Pennsylvanian coleoids (Cephalopoda) from Nebraska and Iowa, USA." Journal of Paleontology 92, no. 2 (October 18, 2017): 146–56. http://dx.doi.org/10.1017/jpa.2017.79.

Повний текст джерела

Анотація:

AbstractFour rare Pennsylvanian (Stark Shale: Pennsylvanian, Missourian [=Kasimovian]) coleoids from Nebraska and Iowa, which are preserved as flattened partial phragmocones and body chambers associated with three-dimensionally fossilized ink sacs, are herein described as Pabianiconus starkensis new genus new species, Nebraskaconus whitei new genus new species, and Starkites compressus new genus new species. One specimen that is missing most of the phragmocone, is provisionally assigned to Donovaniconus. The fossils are assigned to the Coleoidea because of the presence of ink-filled sacs in the body chamber region of the conch. Additionally, eight fragmented and flattened phragmocones and body-chamber clusters with similar morphologies, including some with ink fragments and arm hooks, are assigned to the Coleoidea, but are not named because of their fragmentary condition. On most of the eight specimens, the shell material is associated with other unidentified finely macerated material, which suggests these fossils are probably either ejectoid masses or coprolites from coleoid predators and/or scavengers. However, the new genera named above appear to have been deposited as complete animals, based on the presence of the ink-filled sacs that are in the body chambers. With their body chamber and phragmocone morphologies, these rare coleoid taxa provide valuable information about conch variability within the Carboniferous evolutionary radiation of coleoids.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Doguzhaeva, Larisa A., and Royal H. Mapes. "A new late Carboniferous coleoid from Oklahoma, USA: implications for the early evolutionary history of the subclass Coleoidea (Cephalopoda)." Journal of Paleontology 92, no. 2 (December 4, 2017): 157–69. http://dx.doi.org/10.1017/jpa.2017.81.

Повний текст джерела

Анотація:

AbstractThe limited record of the bactritoid-like coleoid cephalopods is here expanded due to discovery of a late Carboniferous (Moscovian) orthocone comprising a phragmocone and a body chamber with a proostracum-like structure, a sheath-like rostrum, an ink sac, and a muscular mantle preserved on top of the conch. The specimen comes from the Wewoka Formation in the vicinity of the city of Okmulgee, Oklahoma, which previously yielded an orthocone indicative of an evolutionary branch of the Carboniferous cephalopods described as the order Donovaniconida Doguzhaeva, Mapes, and Mutvei, 2007a within the subclass Coleoidea Bather, 1888. Here, we describe from that site a bactritoid-like coleoid,Oklaconus okmulgeensisn. gen. n. sp. in Oklaconidae n. fam. A broad lateral lobe of the suture line and a compressed conch with a narrowed dorsal side and a broadly rounded ventral side distinguish this genus fromDonovaniconusDoguzhaeva, Mapes, and Mutvei, 2002b. The muscular mantle is preserved as a dense sheet-like structure, with a crisscross pattern and a globular-lamellar ultrastructure. Recent knowledge on the early to late Carboniferous coleoids is discussed. Carboniferous coleoids show a high morphological plasticity with a capacity for being altered to create the diverse combinations of ‘bactritoid’ and ‘coleoid’ structures. This could be the principle evolutionary driver of their radiation in the late Carboniferous.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Tanner, Alastair R., Dirk Fuchs, Inger E. Winkelmann, M. Thomas P. Gilbert, M. Sabrina Pankey, Ângela M. Ribeiro, Kevin M. Kocot, et al. "Molecular clocks indicate turnover and diversification of modern coleoid cephalopods during the Mesozoic Marine Revolution." Proceedings of the Royal Society B: Biological Sciences 284, no. 1850 (March 15, 2017): 20162818. http://dx.doi.org/10.1098/rspb.2016.2818.

Повний текст джерела

Анотація:

Coleoid cephalopod molluscs comprise squid, cuttlefish and octopuses, and represent nearly the entire diversity of modern cephalopods. Sophisticated adaptations such as the use of colour for camouflage and communication, jet propulsion and the ink sac highlight the unique nature of the group. Despite these striking adaptations, there are clear parallels in ecology between coleoids and bony fishes. The coleoid fossil record is limited, however, hindering confident analysis of the tempo and pattern of their evolution. Here we use a molecular dataset (180 genes, approx. 36 000 amino acids) of 26 cephalopod species to explore the phylogeny and timing of cephalopod evolution. We show that crown cephalopods diverged in the Silurian–Devonian, while crown coleoids had origins in the latest Palaeozoic. While the deep-sea vampire squid and dumbo octopuses have ancient origins extending to the Early Mesozoic Era, 242 ± 38 Ma, incirrate octopuses and the decabrachian coleoids (10-armed squid) diversified in the Jurassic Period. These divergence estimates highlight the modern diversity of coleoid cephalopods emerging in the Mesozoic Marine Revolution, a period that also witnessed the radiation of most ray-finned fish groups in addition to several other marine vertebrates. This suggests that that the origin of modern cephalopod biodiversity was contingent on ecological competition with marine vertebrates.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Jattiot, Romain, Nathalie Coquel-Poussy, Isabelle Kruta, Isabelle Rouget, Alison J. Rowe, and Jean-David Moreau. "The first gladius-bearing coleoid cephalopods from the lower Toarcian “Schistes Cartons” Formation of the Causses Basin (southeastern France)." PeerJ 12 (February 26, 2024): e16894. http://dx.doi.org/10.7717/peerj.16894.

Повний текст джерела

Анотація:

The fossil record of gladius-bearing coleoids is scarce and based only on a few localities with geological horizons particularly favourable to their preservation (the so-called Konservat-Lagerstätten), which naturally leads to strongly limited data on geographical distributions. This emphasizes the importance of every new locality providing gladius-bearing coleoids. Here, we assess for the first time the gladius-bearing coleoid taxonomic diversity within the lower Toarcian “Schistes Cartons” of the Causses Basin (southeastern France). The material includes two fragmentary gladii, identified as Paraplesioteuthis sagittata and ?Loligosepia sp. indet. Just with these two specimens, two (Prototeuthina and Loligosepiina) of the three (Prototeuthina, Loligosepiina and Teudopseina) suborders of Mesozoic gladius-bearing coleoids are represented. Thus, our results hint at a rich early Toarcian gladius-bearing coleoid diversity in the Causses Basin and point out the need for further field investigations in the lower Toarcian “Schistes Cartons” in this area. This new record of Paraplesioteuthis sagittata is only the second one in Europe and the third in the world (western Canada, Germany and now France). Based on these occurrences, we tentatively suggest that P. sagittata originated in the Mediterranean domain and moved to the Arctic realm through the Viking Corridor to eventually move even farther to North America.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Shoshan, Yoav, Noa Liscovitch-Brauer, Joshua J. C. Rosenthal, and Eli Eisenberg. "Adaptive Proteome Diversification by Nonsynonymous A-to-I RNA Editing in Coleoid Cephalopods." Molecular Biology and Evolution 38, no. 9 (May 22, 2021): 3775–88. http://dx.doi.org/10.1093/molbev/msab154.

Повний текст джерела

Анотація:

Abstract RNA editing by the ADAR enzymes converts selected adenosines into inosines, biological mimics for guanosines. By doing so, it alters protein-coding sequences, resulting in novel protein products that diversify the proteome beyond its genomic blueprint. Recoding is exceptionally abundant in the neural tissues of coleoid cephalopods (octopuses, squids, and cuttlefishes), with an over-representation of nonsynonymous edits suggesting positive selection. However, the extent to which proteome diversification by recoding provides an adaptive advantage is not known. It was recently suggested that the role of evolutionarily conserved edits is to compensate for harmful genomic substitutions, and that there is no added value in having an editable codon as compared with a restoration of the preferred genomic allele. Here, we show that this hypothesis fails to explain the evolutionary dynamics of recoding sites in coleoids. Instead, our results indicate that a large fraction of the shared, strongly recoded, sites in coleoids have been selected for proteome diversification, meaning that the fitness of an editable A is higher than an uneditable A or a genomically encoded G.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Fuchs, Dirk, Vladimir Laptikhovsky, Svetlana Nikolaeva, Alexei Ippolitov, and Mikhail Rogov. "Evolution of reproductive strategies in coleoid mollusks." Paleobiology 46, no. 1 (January 31, 2020): 82–103. http://dx.doi.org/10.1017/pab.2019.41.

Повний текст джерела

Анотація:

AbstractColeoid cephalopods exhibited two distinct reproductive strategies, resulting in small pelagic and large demersal hatchlings, both in the geologic past and recently. In ectocochleate cephalopods, the hatching event is recorded in shell structures (e.g., nepionic constrictions, ultrastructural shifts, or ornamentation differences). In contrast, well-defined hatching markers do not exist on coleoid shells. Changes in septal spacing may be evidence of hatching (e.g., some extant sepiids), but not in all fossil groups. In the present study, we subdivide the early ontogenetic shells of phragmocone-bearing coleoids (belemnoids, spirulids, and sepiids) into key architectural stages and describe their reference to the hatching event. Belemnoids exhibit three key stages, the second of which is here considered to occur shortly before or after hatching. In spirulids and sepiids, there is only one key stage. In Mesozoic belemnoids, spirulids, and sepiids, hatching accordingly occurred with a total shell length of less than 2 mm, which corresponds to mantle lengths of small planktonic hatchlings. Production of small pelagic hatchlings and thus small eggs was therefore the dominant reproductive strategy within the Coleoidea. The first evidence of enlarged hatchlings appeared during the Maastrichtian in Groenlandibelus. During the Eocene, the large-egg strategy apparently became more widespread, particularly in belosaepiids.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Klug, Christian, Gianpaolo Di Silvestro, Rene Hoffmann, Guenter Schweigert, Dirk Fuchs, Thomas Clements, and Pierre Gueriau. "Taphonomic patterns mimic biologic structures: diagenetic Liesegang rings in Mesozoic coleoids and coprolites." PeerJ 9 (January 14, 2021): e10703. http://dx.doi.org/10.7717/peerj.10703.

Повний текст джерела

Анотація:

Because of physiology of coleoids, their fossils preserve soft-tissue-remains more often than other cephalopods. Sometimes, the phosphatized soft-tissues, particularly parts of the muscular mantle, display dark circular patterns. Here, we showcase that these patterns, here documented for fossil coleoids from the Jurassic of Germany and the Cretaceous of Lebanon, superficially resemble chromatophores (which enable living coleoids to alter their coloration). We examined and chemically analyzed the circular structures in these specimens, describe them, and discuss their genesis. Based on their structure and color, we visually differentiate between three types of circles. By comparison with similar structures, we suggest that these structures are not biogenic but Liesegang rings, which formed due to reaction-diffusion processes very soon after death.

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Mutvei, Harry, and Royal H. Mapes. "Carboniferous coleoids with mixed coleoid-orthocerid characteristics: a new light on cephalopod evolution." GFF 140, no. 1 (January 2, 2018): 11–24. http://dx.doi.org/10.1080/11035897.2018.1429490.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Tanabe, Kazushige, Pat Trask, Rick Ross, and Yoshinori Hikida. "Late Cretaceous octobrachiate coleoid lower jaws from the north Pacific regions." Journal of Paleontology 82, no. 2 (March 2008): 398–408. http://dx.doi.org/10.1666/07-029.1.

Повний текст джерела

Анотація:

Eight well-preserved cephalopod jaw fossils were discovered from the Upper Cretaceous (Santonian and Campanian) deposits of Vancouver Island, Canada, and Hokkaido, Japan. They occur individually in calcareous concretions and retain their three-dimensional architecture. Seven of them consist of a widely open outer lamella and a posteriorly projected inner lamella with a pointed rostrum. Both lamellae are made of fluorapatite, which may represent diagenetically altered chitin, and lack a calcareous element. Based on these diagnostic features, the seven jaw fossils are identified as lower jaws of the Coleoidea. Comparison with the lower jaws of modern coleoids allows us to distinguish the following new genera and species among them;Nanaimoteuthis jeletzkyiof the Order Vampyromorphida, andPaleocirroteuthis haggartiandP. pacificaof the Order Cirroctopodida. The lower jaws of these new taxa are clearly distinguished by having a much less projected inner lamella from those of modern and extinct species of the Superorder Decabrachia and the Order Octopodida. The maximum lengths of their outer lamellae (35.0-67.1 mm) are much larger than those of most modern vampyromorph and cirroctopodid species, indicating the large body size and weight of their owners. One of the other three lower jaws examined, characterized by a posteriorly extended outer lamella, may be assigned to the Octopodida. This study clearly demonstrates that large octobrachiate coleoids existed in the Late Cretaceous North Pacific.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Jattiot, Romain, Arnaud Brayard, Emmanuel Fara, and Sylvain Charbonnier. "Gladius-bearing coleoids from the Upper Cretaceous Lebanese Lagerstätten: diversity, morphology, and phylogenetic implications." Journal of Paleontology 89, no. 1 (January 2015): 148–67. http://dx.doi.org/10.1017/jpa.2014.13.

Повний текст джерела

Анотація:

AbstractGladius-bearing coleoids are rare in the fossil record. For the Cretaceous period, these cephalopods are mainly recorded in a few Lagerstätten in Lebanon (Haqel, Hajoula, En Nammoura, and Sahel Aalma). Here, we study 16 specimens of gladius-bearing coleoids from these Upper Cretaceous Lebanese Lagerstätten to investigate their taxonomic diversity. Besides two species that were already reported (Dorateuthis syriacaandGlyphiteuthis libanotica), one new species is identified in the Cenomanian site of Hajoula:Rachiteuthis acutalin. sp., as well as another form ofGlyphiteuthisfrom En Nammoura. Several studied specimens exhibit well-preserved soft-part characters. Among them, we document for the first time two transverse rows of sessile suckers inD.syriacaand we confirm the absence of tentacles, as well as the presence of a crop in this species. This strongly supports the phylogenetic proximity ofD.syriacawith modern vampyropods rather than with modern decabrachians. In turn, the similarity in gladius morphology between this taxon and modern squids is regarded as convergent.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Mather, Jennifer A., and Michael J. Kuba. "The cephalopod specialties: complex nervous system, learning, and cognition." Canadian Journal of Zoology 91, no. 6 (June 2013): 431–49. http://dx.doi.org/10.1139/cjz-2013-0009.

Повний текст джерела

Анотація:

While clearly of molluscan ancestry, the coleoid cephalopods are emergent within the phylum for complexity of brain and behaviour. The brain does not just have centralization of the molluscan ganglia but also contains lobes with “higher order” functions such as storage of learned information, and centres have been compared with the vertebrate cerebellum and frontal lobe. The flexible muscular hydrostat movement system theoretically has unlimited degrees of freedom, and octopuses are models for “soft movement” robots. The decentralized nervous system, particularly in the arms of octopuses, results in decision making at many levels. Free of the molluscan shell and with evolutionary pressure from the bony fishes, coleoids have evolved a specialty in cognition and they may have a simple form of consciousness. Cephalopods also have a skin display system of unmatched complexity and excellence of camouflage, also used for communication with predators and conspecifics. A cephalopod is first and foremost a learning animal, using the display system for deception, having spatial memory, personalities, and motor play. They represent an alternative model to the vertebrates for the evolution of complex brains and high intelligence, which has as yet been only partly explored.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

MUTVEI, HARRY, and DESMOND T. DONOVAN. "SIPHUNCULAR STRUCTURE IN SOME FOSSIL COLEOIDS AND RECENT SPIRULA." Palaeontology 49, no. 3 (May 2006): 685–91. http://dx.doi.org/10.1111/j.1475-4983.2006.00533.x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Fuchs, Dirk, and Robert Weis. "Taxonomy, morphology and phylogeny of Lower Jurassic loligosepiid coleoids (Cephalopoda)." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 249, no. 1 (July 1, 2008): 93–112. http://dx.doi.org/10.1127/0077-7749/2008/0249-0093.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Fuchs, Dirk, and Robert Weis. "Taxonomy, morphology and phylogeny of Lower Jurassic teudopseid coleoids (Cephalopoda)." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 257, no. 3 (September 1, 2010): 351–66. http://dx.doi.org/10.1127/0077-7749/2010/0083.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Mutvei, Harry. "Siphuncular Structure in the Extant Spirula and in Other Coleoids (Cephalopoda)." GFF 139, no. 2 (September 21, 2016): 129–39. http://dx.doi.org/10.1080/11035897.2016.1227364.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Mutvei, Harry, Royal H. Mapes, and Larisa A. Doguzhaeva. "Shell structures in Carboniferous bactritid-like coleoids (Cephalopoda) from South Central USA." GFF 134, no. 3 (September 2012): 201–16. http://dx.doi.org/10.1080/11035897.2012.696134.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Hoffmann, René, Manuel F. G. Weinkauf, and Dirk Fuchs. "Grasping the shape of belemnoid arm hooks—a quantitative approach." Paleobiology 43, no. 2 (February 8, 2017): 304–20. http://dx.doi.org/10.1017/pab.2016.44.

Повний текст джерела

Анотація:

AbstractChitinous arm hooks (onychites) of belemnoid coleoid cephalopods are widely distributed in Mesozoic sediments. Due to their relative abundance and variable morphology compared with the single, bullet-shaped, belemnite rostrum, arm hooks came into the focus of micropaleontologists as a promising index fossil group for the Jurassic–Cretaceous rock record and have been the target of functional, ecological, and phylogenetic interpretations in the past. Based on three well-preserved arm crowns of the Toarcian diplobelid Chondroteuthis wunnenbergi, we analyzed the shape of a total of 87 micro-hooks. The arm crown of Chondroteuthis is unique in having uniserial rather than biserial hooks. The first application of elliptic Fourier shape analysis to the arm weapons of belemnoid coleoids allows for the distinction of four micro-hook morphotypes and the quantification of shape variation within these morphotypes. Based on the best-preserved arm crown, we reconstructed the distribution of morphotypes within the arm crown and along a single arm. Our quantitative data support former observations that smaller hooks were found close to the mouth and at the most distal arm parts, while the largest hooks were found in the central part of the arm crown. Furthermore, we found a distinct arm differentiation, as not every arm was equipped with the same hook morphotype. Here, we report the functional specialization of the belemnoid arm crown for the first time and speculate about the potential function of the four morphotypes based on comparisons with modern cephalopods. Our analyses suggest a highly adapted functional morphology and intra-individual distribution of belemnoid hooks serving distinct purposes mainly during prey capture.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Garassino, Alessandro, and Desmond T. Donovan. "A New Family Of Coleoids From The Lower Jurassic Of Osteno, Northern Italy." Palaeontology 43, no. 6 (December 2000): 1019–38. http://dx.doi.org/10.1111/1475-4983.00160.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Stanley, George D., Carlos González-León, Michael R. Sandy, Baba Senowbari-Daryan, Peter Doyle, Minoru Tamura, and Douglas H. Erwin. "Upper Triassic Invertebrates from the Antimonio Formation, Sonora, Mexico." Journal of Paleontology 68, S36 (July 1994): 1–33. http://dx.doi.org/10.1017/s0022336000062284.

Повний текст джерела

Анотація:

A diverse Upper Triassic tropical marine fauna from northwestern Sonora, Mexico, includes 31 taxa of tropical invertebrates including scleractinian corals, spongiomorphs, disjectoporoids, “hydrozoans,” thalamid and nonthalamid sponges, spiriferid and terebratulid brachiopods, gastropods, bivalves, coleoids, and anomuran microcoprolites. They occur within the late Karnian to Norian part of the Antimonio Formation (Antimonio terrane), which is juxtaposed against a fragmented portion of the North American craton. Most of the fauna is also known from the Tethys region. Sixteen Sonoran taxa co-occur in the western Tethys and five have never been known outside this region. Four additional taxa (one identified only at genus level) are geographically widespread. Some taxa occur in displaced terranes of North America, especially in west-central Nevada (Luning Formation). A weak link exists with the California Eastern Klamath terrane but stronger ties exist with Peru. Among Sonoran sponges,Nevadathalamia polystomawas previously recognized only from the Luning Formation, western Nevada. SpongesCinnabaria expansa, Nevadathalamia cylindrica, and a coral,Astraeomorpha sonorensisn. sp., are also known from Nevada. The coralsDistichomeandra austriaca, Chondrocoenia waltheri, Pamiroseris rectilamellosa, andAlpinophyllia flexuosaco-occur in central Europe. Two new taxa, a spongiomorph hydrozoan,Stromatoporidium lamellatumn. sp., and a disjectoporoid,Pamiropora sonorensisn. sp., have distinct affinities with the Tethys. The geographically widespread North American brachiopod,Spondylospira lewesensis, andPseudorhaetina antimoniensisn. gen. and sp. are among the Sonoran fauna. The Sonoran coleoid (aulacocerid)Dictyoconites(Dictyoconites) cf.D. reticulatumoccurs in the Tethys realm andCalliconitescf.C. drakeiis comparable with a species from the Eastern Klamath terrane.Calliconites millerin. sp. is the first occurrence of the genus outside Sicily. The bivalvesMyophorigonia jaworskii, M. salasi, andPalaeocardita peruvianaare known from Sonora and Peru. Eight gastropod taxa includeGuidoniacf.G. intermediaandG.cf.G. parvula, both previously known from Peru, andEucycloscala subbisertusfrom the western Tethys. The gastropods are unlike those already known from other North American terranes.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

FUCHS, DIRK, HELMUT KEUPP, PAT TRASK, and KAZUSHIGE TANABE. "Taxonomy, morphology and phylogeny of Late Cretaceous spirulid coleoids (Cephalopoda) from Greenland and Canada." Palaeontology 55, no. 2 (March 2012): 285–303. http://dx.doi.org/10.1111/j.1475-4983.2011.01125.x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Tanabe, Kazushige, and Royal H. Mapes. "Jaws and radula of the Carboniferous ammonoid Cravenoceras." Journal of Paleontology 69, no. 4 (July 1995): 703–7. http://dx.doi.org/10.1017/s0022336000035228.

Повний текст джерела

Анотація:

A well-preserved mouth apparatus consisting of jaws and a radula was found in situ within the body chamber of the goniatite Cravenoceras fayettevillae Gordon, 1965 (Neoglyphiocerataceae: Cravenoceratidae), from the middle Chesterian (Upper Mississippian) of Arkansas. Both upper and lower jaws consist of a black material. The lower jaw is characterized by a widely opened larger outer lamella and a shorter inner lamella. The upper jaw is fragmental. The radula is preserved in the anterior portion of the buccal space and comprises a series of tooth elements. Each transverse tooth row consists of seven teeth (a rhachidian and pairs of two lateral and one marginal teeth), with a pair of marginal plates. This arrangement is typical of radulae of other ammonoids of Carboniferous to Cretaceous age, coleoids, and the orthoconic “nautiloid” Michelinoceras (Silurian, Michelinocerida), suggesting a phylogenetic affinity among them.

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Lukeneder, Petra, and Alexander Lukeneder. "Mineralized belemnoid cephalic cartilage from the late Triassic Polzberg Konservat-Lagerstätte (Austria)." PLOS ONE 17, no. 4 (April 20, 2022): e0264595. http://dx.doi.org/10.1371/journal.pone.0264595.

Повний текст джерела

Анотація:

Although hyaline cartilage is widely distributed in various invertebrate groups such as sabellid polychaetes, molluscs (cephalopods, gastropods) and a chelicerate arthropod group (horseshoe crabs), the enigmatic relationship and distribution of cartilage in taxonomic groups remains to be explained. It can be interpreted as a convergent trait in animal evolution and thus does not seem to be a vertebrate invention. Due to the poor fossil record of cartilaginous structures, occurrences of mineralized fossil cartilages are important for evolutionary biology and paleontology. Although the biochemical composition of recent cephalopod cartilage differs from vertebrate cartilage, histologically the cartilages of these animal groups resemble one another remarkably. In this study we present fossil material from the late Triassic Polzberg Konservat-Lagerstätte near Lunz am See (Lower Austria, Northern Calcareous Alps). A rich Carnian fauna is preserved here, whereby a morphogroup (often associated with belemnoid remains) of black, amorphous appearing fossils still remained undetermined. These multi-elemental, symmetrical fossils show remarkable similarities to recent cartilage. We examined the conspicuous micro- and ultrastructure of these enigmatic fossils by thin-sectioning and Scanning Electron Microscopy (SEM). The geochemical composition analyzed by Microprobe and Energy Dispersive X-ray Spectroscopy (SEM-EDX) revealed carbonization as the taphonomic pathway for this fossil group. Mineralization of soft tissues permits the 3D preservation of otherwise degraded soft tissues such as cartilage. We examined eighty-one specimens from the Polzberg locality and seven specimens from Cave del Predil (formerly Raibl, Julian Alps, Italy). The study included morphological examinations of these multi-elemental fossils and a focus on noticeable structures like grooves and ridges. The detected grooves are interpreted to be muscular attachment areas, and the preserved branched system of canaliculi is comparable to a channel system that is also present in recent coleoid cartilage. The new findings on these long-known enigmatic structures strongly point to the preservation of cephalic cartilage belonging to the belemnoid Phragmoteuthis bisinuata and its homologization to the cephalic cartilage of modern coleoids.

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Košťák, Martin, John W. M. Jagt, Robert P. Speijer, Peter Stassen, and Etienne Steurbaut. "New Paleocene Sepiid Coleoids (Cephalopoda) from Egypt: Evolutionary Significance and Origin of the Sepiid ‘Rostrum’." PLoS ONE 8, no. 11 (November 21, 2013): e81180. http://dx.doi.org/10.1371/journal.pone.0081180.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Fuchs, D., S. von Boletzky, and H. Tischlinger. "New evidence of functional suckers in belemnoid coleoids (Cephalopoda) weakens support for the 'Neocoleoidea' concept." Journal of Molluscan Studies 76, no. 4 (October 7, 2010): 404–6. http://dx.doi.org/10.1093/mollus/eyq032.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Fuchs, Dirk, Andreas Klinghammer, and Helmut Keupp. "Taxonomy, morphology and phylogeny of plesioteuthidid coleoids from the Upper Jurassic (Tithonian) Plattenkalks of Solnhofen." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 245, no. 2 (August 1, 2007): 239–52. http://dx.doi.org/10.1127/0077-7749/2007/0245-0239.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Valente, David E., Amanda L. Edwards, and John E. Pollard. "Reappraisal of the gastric contents of a Lower Jurassic ichthyosaur." Geological Curator 9, no. 3 (September 2010): 133–42. http://dx.doi.org/10.55468/gc220.

Повний текст джерела

Анотація:

Re-examination of cephalopod hooklets preserved within the gastric mass of several Lower Jurassic ichthyosaurs reveals that these reptiles fed mainly on phragmoteuthids, rather than belemnites as previously proposed. This conclusion matches the findings of recent research on ichthyosaurs and well-preserved coleoids from the Lower Jurassic (Toarcian) Posidonia Shales of southern Germany. A greater variety of belemnoid species known in the Posidonia Shales includes complete belemnites with bite marks; these provide evidence of predation from large vertebrates such as ichthyosaurs. However, no belemnite rostra have yet been found in the gastric contents of any ichthyosaurs from either Germany or the UK. Examination of the phragmoteuthid hooklets from the gastric mass of a small ichthyosaur in the Manchester University collections reveals that they have a layered fibrous ultrastructure comparable to that of Triassic phragmoteuthids from Austria. These hooklets show pitting and possible abrasion which may be related to gastric processes.

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Basil, J. A., R. T. Hanlon, S. I. Sheikh, and J. Atema. "Three-dimensional odor tracking by Nautilus pompilius." Journal of Experimental Biology 203, no. 9 (May 1, 2000): 1409–14. http://dx.doi.org/10.1242/jeb.203.9.1409.

Повний текст джерела

Анотація:

The ‘living fossil’ Nautilus pompilius is thought to use olfaction as its primary sensory system during foraging, yet neither the organs responsible for olfaction nor the mechanisms or behaviors associated with odor tracking have been subjected to experimentation. Flume testing under dark conditions revealed that Nautilus could consistently detect and follow turbulent odor plumes to the source over distances up to 10 m, exhibiting two types of orientation behavior while sampling in three dimensions. The paired rhinophores were necessary for orientation behavior: when they were temporarily blocked either uni- or bilaterally, Nautilus detected odor but could not track the plume and locate the source. Animals that were tested post-blockage were able to track and locate the source. The role of the 90 thin tentacles remains enigmatic; they seemed to be able to detect odor, but they were not capable of guiding orientation behavior towards a distant odor source. Bilateral chemical sensing by rhinophores in three dimensions may have been the Umwelt of ammonites and belemnites before the evolution of complex eyes and fast locomotion in modern coleoids.

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Shiino, Yuta, and Kota Kitazawa. "Stealth Effect of Red Shell in Laqueus rubellus (Brachiopoda, Terebratulida) on the Sea Bottom: An Evolutionary Insight into the Prey-Predator Interaction." ISRN Zoology 2012 (March 14, 2012): 1–7. http://dx.doi.org/10.5402/2012/692517.

Повний текст джерела

Анотація:

The selective advantage of empire red coloration in the shell of Laqueus rubellus (a terebratulid brachiopod) was examined in terms of prey-predator interactions. The study was based on a comparison of benthic suspension feeders living at a depth of about 130 m in Suruga Bay, Japan, with special reference to their visibility under visible and near-infrared light conditions. Almost all species exhibited red coloration under visible light, while only the shell of Laqueus was dark under infrared light, similar to rocks and bioclasts. Given the functional eyes of macropredators such as fishes and coleoids, which are specialized to detect light in the blue-to-green visible spectrum, and even the long-wavelength photoreceptors of malacosteids, Laqueus should avoid both visible and infrared detection by predators inhabiting the sublittoral bottom zone. This fact suggests that terebratulids have evolved the ability to remain essentially invisible even as the optic detection abilities of predators have improved. The present hypothesis leads to the possibility that the appearance of marine organisms is associated with the passive defensive strategy, making possible to provide a lower predation risk.

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Yamaguchi, Ayaka, Yuichiro Kumada, Andrea C. Alfaro, and Ryoji Wani. "Abrupt changes in distance between succeeding septa at the hatching time in modern coleoids Sepiella japonica and Spirula spirula." Swiss Journal of Palaeontology 134, no. 2 (May 28, 2015): 301–7. http://dx.doi.org/10.1007/s13358-015-0078-x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Konstantinov, A. G., E. S. Sobolev, A. V. Yadrenkin, B. L. Nikitenko, E. B. Pestchevitskaya, N. K. Lebedeva, A. A. Goryacheva, and V. P. Devyatov. "High-Resolution Triassic Biostratigraphy of the Kotelny Island (New Siberian Islands, Arctic Siberia)." Russian Geology and Geophysics 63, no. 4 (April 1, 2022): 398–416. http://dx.doi.org/10.2113/rgg20214424.

Повний текст джерела

Анотація:

Abstract The study of Triassic paleontology and stratigraphy of various regions of northeastern Russia and adjacent Arctic shelf is essential not only for improving and refining zonal biostratigraphic schemes, interregional and global correlation of Triassic deposits, and resolving problems of stratigraphic boundaries but also for developing and substantiating a new generation of Triassic stratigraphic schemes, which could serve as the stratigraphic basis for different regional and detailed geological investigations of the Arctic. The results of the study were used to improve existing zonal scales based on various groups of fauna and palynomorphs, develop a more detailed biostratigraphic subdivision of the Triassic, and characterize individual horizons using both terrestrial and marine palynomorphs. The zonal scales are calibrated to each other and to the regional zonal scale of the Triassic of Siberia and northeastern Russia, which provides the subsequent correlation with the International Chronostratigraphic Chart of the Triassic System. The set of coeval zonal scales for the Triassic of Kotelny Island sections based on ammonoids, nautiloids, coleoids, bivalves, brachiopods, and foraminifers and the analysis of microphytoplankton and terrestrial palynomorph assemblages are a useful tool for detailed subdivision and correlation of the eastern part of the Laptev Sea shelf and adjacent regions of northeastern Russia.

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Donovan, S. K., J. W. M. Jagt, and D. N. Lewis. "Notes on some trace fossils and other parataxa from the Maastrichtian type area, southeast Netherlands and northeast Belgium." Netherlands Journal of Geosciences - Geologie en Mijnbouw 90, no. 2-3 (November 2011): 99–109. http://dx.doi.org/10.1017/s0016774600001050.

Повний текст джерела

Анотація:

AbstractNew specimens described herein add to our knowledge of uncommon parataxa (embedment structures, borings and a certain type of burrow) from the type area of the Maastrichtian Stage, the material originating from the ENCI-HeidelbergCement Group (Maastricht), Ankerpoort-'t Rooth (Bemelen) and former Blom (Berg en Terblijt) quarries in southern Limburg (the Netherlands), and from the CBR-Romontbos (Eben Emael) and CPL SA (Haccourt) chalk pits in the province of Liège (northeast Belgium). Although Centrichnus eccentricus Bromley & Martinell has previously been recorded from this area, it has not received formal description; the specimen documented herein shares a test of the echinoid Echinocorys gr. conoidea with numerous other episkeletozoans. Podichnus cf. centrifugalis Bromley & Surlyk occurs both on echinocorythid echinoid tests and guards of belemnitellid coleoids; two out of seven specimens display radial discontinuous channels, indicative of the extreme penetration of filaments from the attached brachiopod's pedicle. Renichnus arcuatus Mayoral shows a range of morphologies, from the embedment structure sensu stricto through to specimens retaining internal moulds of the producing, embedded vermetid gastropod to free shells of Vermetus binkhorsti Cossmann. Burrows packed with bioclastic debris, particularly primary spines and a few test plates of phymosomatid echinoids, present a systematic conundrum, although appearing comparable to the ichnogenera Nummipera Hölder and Baronichnus Breton in several respects.

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Mutvei, Harry, and Royal H. Mapes. "Carboniferous orthocerid-like coleoid Mitorthoceras with unique shell structure (new order Tuborthocerida, Coleoidea, Cephalopoda); comparison with bactritid-like coleoid Shimanskya." GFF 141, no. 2 (April 3, 2019): 121–32. http://dx.doi.org/10.1080/11035897.2019.1572218.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Moreau, Jean-David, Romain Vullo, Sylvain Charbonnier, Romain Jattiot, Vincent Trincal, Didier Néraudeau, Emmanuel Fara, et al. "Konservat-Lagerstätten from the Upper Jurassic lithographic limestone of the Causse Méjean (Lozère, southern France): palaeontological and palaeoenvironmental synthesis." Geological Magazine 159, no. 5 (January 17, 2022): 761–81. http://dx.doi.org/10.1017/s0016756821001382.

Повний текст джерела

Анотація:

AbstractSince the 1980s, the Upper Jurassic lithographic limestone of the Causse Méjean (southern France) has been known by local naturalists to yield fossils. However, until the beginning of the 21st century, this plattenkalk remained largely undersampled and scientifically underestimated. Here, we present the results of two decades of prospection and sampling in the Drigas and the Nivoliers quarries. We provide the first palaeontological inventory of the fossil flora, the fauna and the ichnofauna for these localities. The fossil assemblages show the co-occurrence of marine and terrestrial organisms. Marine organisms include algae, bivalves, brachiopods, cephalopods (ammonites, belemnites and coleoids such as Trachyteuthis), echinoderms, decapod crustaceans (ghost shrimps, penaeoid shrimps and glypheoid lobsters) and fishes (including several actinopterygians and a coelacanth). Terrestrial organisms consist of plant remains (conifers, bennettitaleans, pteridosperms) and a single rhynchocephalian (Kallimodon cerinensis). Ichnofossils comprise traces of marine invertebrates (e.g. limulid trackways, ammonite touch mark) as well as coprolites and regurgitalites. Given the exquisite preservation of these fossils, the two quarries can be considered as Konservat-Lagerstätten. Both lithological features and fossil content suggest a calm, protected and shallow-marine environment such as a lagoon partially or occasionally open to the sea. Most fossils are allochthonous to parautochthonous and document diverse ecological habitats. Similarly to other famous Upper Jurassic plattenkalks of western Europe such as Solnhofen, Cerin or Canjuers, the Causse Méjean is a key landmark for our understanding of coastal/lagoonal palaeoecosystems during the Kimmeridgian–Tithonian interval.

Стилі APA, Harvard, Vancouver, ISO та ін.

34

WELLS, M. J., and J. WELLS. "Ventilation and Oxygen Uptake by Nautilus." Journal of Experimental Biology 118, no. 1 (September 1, 1985): 297–312. http://dx.doi.org/10.1242/jeb.118.1.297.

Повний текст джерела

Анотація:

The shell of Nautilus prevents the mantle from playing any part in creating the ventilatory stream. This is generated instead by movements of the collar and funnel folds which fuse to form flaps (the ‘wings’), overlapping below and joined to the head above. The gills lie horizontally, dividing the space enclosed by the wings into three cavities, two lateral and prebranchial, on either side of the head, and a common ventral postbranchial space. Water is drawn in above, behind the eyes, and expelled forward through the siphon of the funnel, which is used both for ventilation and jet propulsion. The pressures driving the ventilatory stream are small (of the order of 0.1 kPa), but the complex movement of the wings, described below, is such that there is (very nearly) always a pressure differential and a water flow across the gills, despite a pulsed intake and outward jet. Oxygen extraction is low by the standards of other cephalopods, only 5–10%, falling during jet propulsion and rising (exceptionally to 40%) at rest after exercise. Ventilation frequency, 35 min−1 at 16°C, rises with temperature. Ventilation stroke volumes ranged from 5 to 22 ml for an animal of 395 g. At 17 °C Nautilus can regulate its oxygen uptake down to a Po2 of about 75 mmHg. Uptake at rest ranged from 0.22 to 0.46 ml kg−1 min−1 (exceptionally 0.75 ml kg−1 min−1 after feeding) for animals of 351–395 g. In terms of flesh weight, this yields an average of 0.50mlkg−1 min−1, half to one-third of the uptake one would expect from coleoids of similar weights and at similar temperatures.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Jeffery, Charlotte H. "Paleobase: macrofossils part 2. Ammonoids, bivalves coleoids, gastropods and other mollusca edited by Norman MacLeod, Blackwell Publishing, Oxford, 2003. ISBN 0632 05891 9(CD-ROM)." Geological Journal 39, no. 2 (April 2004): 228–29. http://dx.doi.org/10.1002/gj.972.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Linzmeier, Benjamin J., Neil H. Landman, Shanan E. Peters, Reinhard Kozdon, Kouki Kitajima, and John W. Valley. "Ion microprobe–measured stable isotope evidence for ammonite habitat and life mode during early ontogeny." Paleobiology 44, no. 4 (September 3, 2018): 684–708. http://dx.doi.org/10.1017/pab.2018.21.

Повний текст джерела

Анотація:

AbstractAmmonites have disparate adult morphologies indicative of diverse ecological niches, but ammonite hatchlings are small (~1 mm diameter), which raises questions about the similarity of egg incubation and hatchling life mode in ammonites. ModernNautilusis sometimes used as a model organism for understanding ammonites, but despite their outward similarities, the groups are only distantly related. Trends in ammonite diversity and extinction vulnerability in the fossil record contrast starkly with those of nautilids, and embryonic shells from Late Cretaceous ammonites are two orders of magnitude smaller than nautilid embryonic shells. To investigate possible environmental changes experienced by ammonite hatchlings, we used secondary ion mass spectrometry to analyze the oxygen and carbon isotope composition of the embryonic shells and early postembryonic whorls of five juveniles ofHoploscaphites comprimusobtained from a single concretion in the Fox Hills Formation of South Dakota. Co-occurring bivalves and diagenetic calcite were also analyzed to provide a benthic baseline for comparison. The oxygen isotope ratios of embryonic shells are more like those of benthic bivalves, suggesting that ammonite eggs were laid on the bottom. Ammonite shell immediately after hatching has more negative δ18O, suggesting movement to more shallow water that is potentially warmer and/or fresher. After approximately one whorl of postembryonic growth, the values of δ18O become more positive in three of the five individuals, suggesting that these animals transitioned to a more demersal mode of life. Two other individuals transition to even lower δ18O values that could suggest movement to nearshore brackish water. These data suggest that ammonites, like many modern coleoids, may have spawned at different times of the year. Because scaphites were one of the short-term Cretaceous–Paleogene extinction survivors, it is possible that this characteristic allowed them to develop a broader geographic range and, consequently, a greater resistance to extinction.

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Rolfe, W. D. Ian. "Form and function in Thylacocephala, Conchyliocarida and Concavicarida (?Crustacea): a problem of interpretation." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 76, no. 2-3 (1985): 391–99. http://dx.doi.org/10.1017/s0263593300010609.

Повний текст джерела

Анотація:

ABSTRACTDifferences in the preservation of Jurassic thylacocephalans and conchyliocarids have given rise to different interpretations of the form of these fossils, and thus their mode of life. When evidence from these two groups is combined with that derived from Palaeozoic concavicarids, it becomes possible to unify the several interpretations of this one group of organisms, the Thylacocephala. The group ranges from at least the Silurian to the Cretaceous.A review is given of how these differences of interpretation have arisen, and some resolution is attempted. If the thylacocephalan “anterior structure” is reinterpreted by analogy with hyperiid amphipods as a paired compound eye occupying most of the surface of the head, it explains its bilobed nature and the position of the stomach within the structure, but it raises the difficulty of a post-cephalic origin for the carapace. The simpler solution is preferred of regarding this structure as discrete paired eyes with a smooth cornea and subjacent crystal cones.The raptorial appendages are post-oral and post-adductor in insertion. They are therefore tentatively identified as the maxillae and maxilliped, but verification of the mandible's position is needed to test this. The postero-ventral battery of “body somites” is reinterpreted as paired protopods of abdominal limbs. A respiratory current is deduced to have entered a branchiostegal chamber ventrally, and left it posterodorsally. It is speculated that the looped linear pattern of intra-cuticular spheres in Paraostenia are photophores. The large eyes with small interommatidial angles were probably used to discern low contrast prey or carrion against a dim background. By analogy with hyperiid amphipods, it is suggested that at least some thylacocephalans were mesopelagic predators. They may have attained neutral buoyancy from their food substrate of shark and coleoids.

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Schlögl, Ján, Martin Košt’ák, and Matúš Hyžný. "First record of a gladius-bearing coleoid Teudopsis bollensis Voltz (Cephalopoda, Coleoidea) in the Toarcian of the Western Carpathians (Slovakia)." Paläontologische Zeitschrift 86, no. 4 (May 31, 2012): 367–75. http://dx.doi.org/10.1007/s12542-012-0139-z.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Rogov, Mikhail, Aleksandr Mironenko, Alexey Ippolitov, and Oleg Lutikov. "A First Record of Lower Jurassic (Toarcian) Coleoid Jaws in Siberia." Diversity 15, no. 6 (June 5, 2023): 742. http://dx.doi.org/10.3390/d15060742.

Повний текст джерела

Анотація:

In the present paper, we describe several coleoid jaws discovered in the lower Toarcian black shales, cropping out along the Vilyui River (Yakutia, Russia). This is the first record of a Lower Jurassic coleoid jaw outside Europe and the first report of such a finding from the Mesozoic of Siberia. The described coleoid jaws demonstrate the same mode of preservation and morphology as the coeval jaws previously reported from Europe. Their preservation in Siberia became possible due to the widespread occurrence of black shale facies associated with the early Toarcian oceanic anoxic event (TOAE).

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Kruta, Isabelle, Isabelle Rouget, Sylvain Charbonnier, Jérémie Bardin, Vincent Fernandez, Damien Germain, Arnaud Brayard, and Neil Landman. "Proteroctopus ribetiin coleoid evolution." Palaeontology 59, no. 6 (October 6, 2016): 767–73. http://dx.doi.org/10.1111/pala.12265.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Lozouet, Pierre. "Paleobase Macrofossils Part 2.0. Ammonoids, Bivalves, Coleoids, Gastropods and other Mollusca, N. Macleod (ed.). Blackwell Publishing and the Natural History Museum, 2003, £27.50 (single user) £130 (site licence). ISBN 0-63205891-9 (CD-ROM)." Journal of Quaternary Science 19, no. 8 (November 23, 2004): 836–37. http://dx.doi.org/10.1002/jqs.867.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Dernov, Vitaly. "Coleolus carbonarius Demanet, 1938 (incertae sedis) from the late Bashkirian (Carboniferous) of the Donets Basin." GEO&BIO 2022, no. 22 (June 30, 2022): 79–93. http://dx.doi.org/10.15407/gb2207.

Повний текст джерела

Анотація:

Problematic fossils Coleolus carbonarius Demanet, 1938 were described from seven localities of the Mospyne Formation (late Bashkirian, Carboniferous) of the central Donets Basin. Many authors attributed these conoidal fossils to various groups of animals, including worms, conulariids, pteropods, hyoliths, tentaculitids, gastropods, scaphopods, and other molluscs without specifying the class, as well as phyllocarids. Representatives of the genus Coleolus cannot belong to the scaphopods because the apex of their tube is closed. The aperture of the tube in living Coleolus is directed upwards, while in scaphopods it is directed downwards. The belonging of Coleolus to pteropods was challenged by previous authors. The assignment of Coleolus to Coniconchia is also incorrect, because the shells of Coniconchia have chambers, which are absent in Coleolidae. The ecological and some morphological characteristics of Coleolus indicate their proximity to sedentary polychaete annelids (Sedentaria) or phoronids (Phoronida). Almost all Coleolus remains come from sediments that formed in a shallow marine environment with a low sedimentation rate and contamination of the bottom silt and, possibly, the bottom layer of the water column with hydrogen sulphide. Coleolus carbonarius, according to all of the obtained data, was a semi-infaunal animal. The apical end of the tube was deeply immersed into the semi-liquid clayey silt. Only a small part of the tube protruded above the surface. The characteristic transverse ornament of the tube surface, possibly, increased the contact area of the unstable semi-liquid clayey silt and the tube and further stabilized the vertical position of the animal in the bottom sediment. The sedentary lifestyle of Coleolus apparently suggests that these animals fed on planktonic organisms and organic detritus suspended in the water column. This type of feeding is possible only in the presence of a developed hunting apparatus. The morphology of the tubes of Coleolus carbonarius Demanet, 1938 is described in the article, including the structure of their apical end and aperture. Traces of damage caused during the lifetime of animals on the apical part of their tube are also studied.

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Talbot, Christopher, Thomas M. Jordan, Nicholas W. Roberts, Shaun P. Collin, N. Justin Marshall, and Shelby E. Temple. "Corneal microprojections in coleoid cephalopods." Journal of Comparative Physiology A 198, no. 12 (September 16, 2012): 849–56. http://dx.doi.org/10.1007/s00359-012-0755-9.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

44

VECCHIONE, MICHAEL, RICHARD E. YOUNG, DESMOND T. DONOVAN, and PAUL G. RODHOUSE. "Reevaluation of coleoid cephalopod relationships based on modified arms in the Jurassic coleoid Mastigophora." Lethaia 32, no. 2 (March 29, 2007): 113–18. http://dx.doi.org/10.1111/j.1502-3931.1999.tb00529.x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Sweeney, A. M., S. H. D. Haddock, and S. Johnsen. "Comparative visual acuity of coleoid cephalopods." Integrative and Comparative Biology 47, no. 6 (May 22, 2007): 808–14. http://dx.doi.org/10.1093/icb/icm092.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Vecchione, Michael, Richard E. Young, and Desmond T. Donovan. "Questions of Coleoid Cephalopod Relationships Based On the Possibility of Tentacles in the Jurassic Coleoid Mastigophora." Paleontological Society Special Publications 8 (1996): 406. http://dx.doi.org/10.1017/s2475262200004081.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Skelton, Peter. "MACLEOD, N. 2003. PaleoBase. Macrofossils Part 2.0. Ammonoids, Bivalves, Coleoids, Gastropods, and other Mollusca. vi+19 pp. +CD-ROM, in boxed set. PC and Mac compatible. Oxford, Malden, Carlton: Blackwell Publishing. Price £29.99 (boxed set). ISBN 0 632 05891 9." Geological Magazine 142, no. 3 (May 2005): 303–4. http://dx.doi.org/10.1017/s0016756805220770.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Riccardi, A. C., and N. Sabattini. "Supposed coleoid remains reinterpreted as fish scales." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1985, no. 11 (December 4, 1985): 700–706. http://dx.doi.org/10.1127/njgpm/1985/1985/700.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Challinor, A. B., and J. A. Grant-Mackie. "Jurassic Coleoidea of New Caledonia." Alcheringa: An Australasian Journal of Palaeontology 13, no. 4 (January 1989): 269–304. http://dx.doi.org/10.1080/03115518908619051.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Bhandari, Renuka, C. S. Mathela, Philip S. Beauchamp, A. T. Bottini, and V. Dev. "Coleons from Nepeta elliptica." Phytochemistry 34, no. 5 (November 1993): 1438–39. http://dx.doi.org/10.1016/0031-9422(91)80047-5.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!