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    Tytuł:
    A new euselachian shark from the early Permian of the Middle Urals, Russia
    Autorzy:
    IVANOV, ALEXANDER O.
    DUFFIN, CHRISTOPHER J.
    NAUGOLNYKH, SERGE V.
    Tematy:
    chondrichthyes
    elasmobranchii
    teeth
    permian
    russia
    urals
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/945229.pdf  Link otwiera się w nowym oknie
    Opis:
    The isolated teeth of a new euselachian shark Artiodus prominens Ivanov and Duffin gen. et sp. nov. have been found in the Artinskian Stage (Early Permian) of Krasnoufimskie Klyuchiki quarry (Sverdlovsk Region, Middle Urals, Russia). The teeth of Artiodus possess a multicuspid orthodont crown with from four to nine triangular cusps; prominent labial projection terminating in a large round tubercle; distinct ornamentation from straight or recurved cristae; oval or semilunar, elongate, considerably vascularized base; dense vascular network formed of transverse horizontal, ascending, short secondary and semicircular canals. The teeth of the new taxon otherwise most closely resemble the teeth of some protacrodontid and sphenacanthid euselachians possessing a protacrodont-type crown, but differ from the teeth of all other known euselachians in the unique structure of the labial projection. The studied teeth vary in crown and base morphology, and three tooth morphotypes can be distinguished in the collection reflecting a moderate degree of linear gradient monognathic heterodonty. The range of morphologies otherwise displayed by the collection of teeth shows the greatest similarity to that described for the dentitions of relatively high-crowned hybodontids from the Mesozoic. The internal structure of the teeth, including their vascularization system is reconstructed using microtomography. The highest chondrichthyan taxonomic diversity is found in the Artinskian, especially from the localities of the Middle and South Urals.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Givetian (Middle Devonian) sharks from Cairo, New York (USA): Evidence of early cosmopolitanism
    Autorzy:
    Potvin-Leduc, D.
    Cloutier, R.
    Landing, E.
    Hernick, L.V.
    Mannolini, F.
    Tematy:
    Chondrichthyes
    Elasmobranchii
    Antarctilamnidae
    Omalodontiformes
    taxonomy
    ontogenesis
    paleobiogeography
    Devonian
    North America
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/945591.pdf  Link otwiera się w nowym oknie
    Opis:
    Whereas cosmopolitan distribution patterns are established for many Late Devonian vertebrates (e.g., placoderms, onychodontiforms), few palaeobiogeographic studies have considered chondrichthyans. Recent discoveries of shark material demonstrate that some chondrichthyans were cosmopolitan by the Middle Devonian. Abundant Givetian microremains have been recovered from the Cairo quarry in eastern New York State, USA. These include teeth of two shark species with Gondwanan affinities, the omalodontid Portalodus mannoliniae sp. nov. and the antarctilamnid Wellerodus priscus. Abundant teeth of P. mannoliniae sp. nov. are characterized by a smooth diplodont crown, polarized cusps, and a labially oriented base. The teeth demonstrate monognathic heterodonty. The juvenile morph is distinguished from the adult by smaller size, slender cusps, and variation in the shape of the base. W. priscus is represented by rare juvenile teeth. Two groups of scales that show affinity to material from northern (Spain) and East Gondwana (Antarctica) are tentatively attributed to the two described species. Antarctilamnid distribution suggests a north Gondwanan origin and a colonization of the margin of the landmass before dispersing to Laurentia by the Middle Devonian. This material further indicates that vertebrate global dispersal was initiated by the Middle Devonian, and emphasizes earlier palaeogeographic interpretations that the Middle Devonian “Hamilton fauna” of North American Laurussia originated in the Early Devonian in South American Gondwana.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Taxonomic notes on Phoebodus heslerorum and Symmorium reniforme [Chondrichthyes, Elasmobranchii]
    Autorzy:
    Ginter, M
    Tematy:
    Carboniferous
    Symmorium reniforme
    Paleozoic
    tooth
    Elasmobranchii
    Phoebodus heslerorum
    taxonomy
    paleontology
    Chondrichthyes
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/23345.pdf  Link otwiera się w nowym oknie
    Opis:
    The revision of shark teeth from the Pennsylvanian black shales of central USA, ascribed to “Phoebodus heslerorum” Williams, 1985 and Symmorium reniforme Cope, 1893, shows that “Ph. heslerorum” is a junior synonym of “Cladodus” divergens Trautschold, 1879. This species belongs neither to Phoebodus nor to Cladodus, so a new genus Heslerodus is proposed. Very common, robust cladodont teeth with a deep labio−basal depression and two buttons, often referred to as S. reniforme, do not belong to the latter species, but to “Cladodus” occidentalis Leidy, 1859. The generic affinity of “C.” occidentalis is yet undetermined, but it is possible that it represents ctenacanthoids.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biometric analysis of the teeth of fossil and Recent hexanchid sharks and its taxonomic implications
    Autorzy:
    Adnet, S.
    Tematy:
    Elasmobranchii
    Hexanchidae
    Recent cow shark
    Recent ocean
    biometry
    fossil
    shark
    taxonomy
    tooth
    Eocene
    paleontology
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/21403.pdf  Link otwiera się w nowym oknie
    Opis:
    A biometric analysis of the lower teeth of Recent cow sharks (Hexanchidae) investigates the ontogenetic and phylogenetic aspects of the dental characters employed by many ichthyologists and palaeontologists. The dental characters currently used to separate two extant species of sixgill sharks (Hexanchus griseus and H. nakamurai) are analysed and the fossil record of their relatives reviewed. The main results suggest that the cusp number ratio (number of cusps per mm) is preferable to width of the lower tooth for inference of total body size, at least in species of Hexanchus. The presence of a serrated edge or an enlarged acrocone appears to depend on ontogeny and care must be taken when using these as taxomomic characters. Three Eocene species of Hexanchus, H. collinsonae, H. hookeri, and H. agassizi, and a new assemblage of fossil teeth from the late Ypresian/early Lutetian (Early/Middle Eocene) of south−western France, are also analysed. The first two of these species may be ontogenetic states of H. agassizi. Hexanchus agassizi, belonging to the vituliform lineage and closely related to the living H. nakamurai, is considered here to be the only species of Hexanchus in the Lower to Middle Eocene. A brief overview of Palaeogene Hexanchus, suggests no evidence of the grisiform group (closely related to living H. griseus) before the Late Eocene.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chondrichthyan remains from the Lower Carboniferous of Muhua, Southern China
    Autorzy:
    Ginter, M.
    Sun, Y.
    Tematy:
    Carboniferous
    China
    Chondrichthyes
    Elasmobranchii
    Euchondrocephali
    Lower Carboniferous
    Muhua
    chondrichthyan
    remains
    tooth
    Tournaisian
    paleontology
    systematics
    morphology
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/22216.pdf  Link otwiera się w nowym oknie
    Opis:
    The shallow water assemblage of chondrichthyan microremains, teeth, tooth plates and scales, from the middle Tournaisian (Mississippian) of the vicinity of Muhua village, Guizhou province, southern China, is thus far the richest and most diverse association of this age collected from a single locality and horizon, and represents a chondrichthyan community very restricted in time and space. It was recovered from a small bioclastic limestone lens, MH−1, occurring among basinal marls near the base of the Muhua Formation, and dated as to the Siphonodella crenulata conodont Zone. The majority of the fauna presented here consists of teeth with euselachian−type bases and crushing crowns belonging to bottom−dwelling durophagous chondrichthyans, most probably feeding on shelly invertebrates such as the abundant brachiopods. We assigned most of these teeth to Euselachii (six species, among them Cassisodus margaritae gen. et sp. nov.), Petalodontiformes (two species), Holocephali (five species), and Euchondrocephali incertae sedis (Cristatodens sigmoidalis gen. et sp. nov.). We also identified primitive polycuspid, clutching teeth representing Phoebodontiformes (Thrinacodus bicuspidatus sp. nov.), Symmoriiformes, and Ctenacanthiformes. The scales are typical growing, compound forms of the protacrodont, ctenacanth, and hybodont types. Two problematic denticulated plates were found, one of which resembles mandibular or palatal plates of Sibyrhynchus (Iniopterygii). Several of the identified chondrichthyan taxa have hitherto been known only from Laurussia, especially from the British Isles and central USA. In particular we found the first record of Chondrenchelyssp. and Diclitodus denshumani outside their type locality. Th. bicuspidatus sp. nov., also known from Nevada, Iran, and NW Australia, appears to be a cosmopolitan, middle Tournaisian index fossil.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A contribution to the knowledge of Miocene Elasmobranchii from Pinczow (Poland)
    Przyczynek do znajomości mioceńskich spodoustych (Elasmobranchii) z Pińczowa
    K voprosu o znanii miocenovykh elasmobrankhijj iz Pin'chova (Pol'sha)
    Autorzy:
    Radwanski, A.
    Tematy:
    contribution
    knowledge
    paleontology
    remains
    Lower Tortonian
    Tortonian
    fish
    elasmobranch fish
    Miocene
    Elasmobranchii
    Pinczow town
    Polska
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/20868.pdf  Link otwiera się w nowym oknie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neoselachian remains [Chondrichthyes, Elasmobranchii] from the Middle Jurassic of SW Germany and NW Poland
    Autorzy:
    Kriwet, J
    Tematy:
    Neoselachii
    Middle Jurassic
    locality
    Polska
    Germany
    remains
    Elasmobranchii
    Folipistrix digitulus
    taxonomy
    Jurassic
    Synechodus prorogatus
    Chondrichthyes
    diversity
    neoselachian remains
    distribution
    paleontology
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/22563.pdf  Link otwiera się w nowym oknie
    Opis:
    New neoselachian remains from the Middle Jurassic of SW Germany and NW Poland are described. The locality of Weilen unter den Rinnen in SW Germany yielded only few orectolobiform teeth from the Aalenian representing at least one new genus and species, Folipistrix digitulus, which is assigned to the orectolobiforms and two additional orectolobiform teeth of uncertain affinities. The tooth morphology of Folipistrix gen. nov. indicates a cutting dentition and suggests specialised feeding habits. Neoselachians from Bathonian and Callovian drill core samples from NW Poland produced numerous selachian remains. Most teeth are damaged and only the crown is preserved. Few identifiable teeth come from uppermost lower to lower middle Callovian samples. They include a new species, Synechodus prorogatus, and rare teeth attributed to Palaeobrachaelurussp., Pseudospinax? sp., Protospinax cf. annectans Woodward, 1919, two additional but unidentifiable Protospinax spp. and Squalogaleussp. Scyliorhinids are represented only by few isolated tooth crowns. No batoid remains have been recovered. The two assemblages contribute to the knowledge about early neoselachian distribution and diversity.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Eocene scyliorhinid sharks from the Trans-Urals, Russia
    Autorzy:
    Malyshkina, T.
    Tematy:
    Carcharhiniformes
    Elasmobranchii
    Eocene
    Foumtizia pattersoni
    Foumtizia zhelezkoi
    geological setting
    Late Eocene
    Premontreia
    Premontreia uralica
    Scyliorhinidae
    Siberia
    fossil shark
    locality
    paleontology
    remains
    scyliorhinid shark
    shark
    tooth
    systematics
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/22075.pdf  Link otwiera się w nowym oknie
    Opis:
    Priabonian deposits from two localities, Kurgan and Derney, in the Trans−Urals (Western Siberia) have yielded numerous selachian teeth. The carcharhiniform family Scyliorhinidae is represented by three species, including two new: Premontreia uralica sp. nov., Foumtizia zhelezkoi sp. nov., and F. pattersoni (Cappetta, 1976). Both genera are recorded from the West−Siberian Basin for the first time. Presumably all three species (including the one morphologically mimicking F. pattersoni, a species recorded from Ypresian of England) are endemic for the Trans−Urals region (contrary to the cosmopolitan lamniforms recorded previously from the area. The known distribution pattern of extant scyliorhinids supports the probability of endemism of the cat sharks from the West−Siberian Basin, which has also been isolated geographically from the Peri−Tethys during the Late Eocene marine regression. The peculiar local environmental conditions due to the Priabonian climatic cooling in the Boreal realm might have also facilitated the speciation.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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