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    Wyświetlanie 1-8 z 8
    Tytuł:
    Minute Silurian oncocerid nautiloids with unusual colour patterns
    Autorzy:
    Manda, S
    Turek, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/22242.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Silurian
    paleontology
    oncocerid nautiloid
    nautiloid
    colour pattern
    Cephalopoda
    Nautiloidea
    taxonomy
    shell size
    shell malformation
    Opis:
    A minute Silurian oncocerid Cyrtoceras pollux, from the Prague Basin is assigned here to the genus Pomerantsoceras. The only so far known species of this genus comes from the Upper Ordovician (Hirnantian) of Estonia. Pomerantsoceras thus represents, except for un−revised poorly understood taxa, the single known oncocerid genus surviving the end−Ordovician extinction events. Cyrtoceras pollux is unusual among the Silurian nautiloids because of its small shell. Colour pattern characterised by a few longitudinal bands on the entire circumference of the shell is here reported in oncocerids. Longicone and only slightly curved small shells as in Pomerantsoceras are unusual among nautiloids and resemble straight shells of orthocerids and pseudorthocerids, in which the colour pattern consists of straight colour bands. Consequently the shell shape as well as the colour pattern should be regarded as adaptive convergence with orthocerids and pseudorthocerids. It supports the hypothesis that colour pattern functioned as camouflage and its evolution was under adaptive control. In addition, several types of the shell malformations including anomalous growth of septa, shell wall and pits on an internal mould are described.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 3; 503-512
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concentrations of Silurian nautiloid cephalopods from Russia and Kazakhstan
    Autorzy:
    Bogolepova, O K
    Holland, C H
    Powiązania:
    https://bibliotekanauki.pl/articles/22316.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cephalopoda
    cephalopod
    Silurian
    concentration
    Russia
    living population
    Kazakhstan
    paleontology
    nautiloid cephalopod
    Opis:
    Silurian cephalopod limestones known from northern Asia are usually singular beds or horizons of nodules. They range in their taphonomic character from the Mojero river type, with postmortem concentration from rich living populations by relatively gentle bottom currents into a submarine low, to that of the Karabutak Formation of the South Urals, where there has been concentration by strong wave or current action.
    Źródło:
    Acta Palaeontologica Polonica; 1995, 40, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
    Autorzy:
    Kroger, B
    Powiązania:
    https://bibliotekanauki.pl/articles/20263.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    fauna
    Cephalopoda
    Orthoceratacea
    Archigeisonoceras folkeslundense
    Archigeisonoceras repplingense
    Plagiostomoceras fragile
    Nautiloidea
    nautiloid
    Nilssonoceras latisiphonatum
    Archigeisonoceras picus
    Kinnekulloceras kinnekullense
    orthoceratacean nautiloid
    Middle Ordovician
    Ordovician
    Baltoscandic Orthoceratite Limestone
    paleontology
    Opis:
    The fauna of the Baltoscandic Orthocerataceae is important because it fills a documentary gap between the Lower Ordovician fauna of North America and the upper Middle Ordovician fauna of China and North America. A revision of the Orthoceratidae, Geisonoceratidae, and Arionoceratidae is given on a material of more than 450 specimens. Intraspecific and ontogenetic variations were observed. The following new taxa are erected: Plagiostomoceras fragile sp. nov., Archigeisonoceras repplingense sp. nov., Archigeisonoceras picus sp. nov. Archigeisonoceras folkeslundense sp. nov., Nilssonoceras latisiphonatum gen. et sp. nov., Kinnekulloceras kinnekullense gen. et sp. nov., and Arionoceras lotskirkense sp. nov. The genus Archigeisonoceras is described for the first time in the Baltoscandic area and the oldest occurrence of the genus Arionoceras is documented from the Middle Ordovician of Baltoscandia. It is shown that the endosiphuncular deposits of the Middle Ordovician orthoceratacaceans are highly variable and widespread in the apical parts of the phragmocone.
    Źródło:
    Acta Palaeontologica Polonica; 2004, 49, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Primary structure of the connecting ring of ammonoids and its preservation
    Autorzy:
    Kulicki, C.
    Tanabe, K.
    Landman, N.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/20506.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ammonite
    ammonoid
    hydrostatic organ
    mineral segment
    nautiloid
    organic segment
    tube
    calcium phosphate
    fossilization
    Opis:
    The most distinctive and important element of the hydrostatic organ of ammonoids and nautiloids is the siphuncular tube. It consists of mineral and organic segments (so−called connecting rings). The connecting ring of ammonites never preserves its original organic matter in the mineralized state, usually having undergone diagenetic phosphatisation, more rarely, calcification, or even complete loss. Our knowledge about its original ultrastructure is based upon comparison with Recent Nautilus and phosphatised or calcified ammonite fossils. We show that depending on the taphonomic history, both calcium phosphate and calcite can participate in the diagenesis of the connecting ring wall. Under standard light microscopy, the phosphatised elements are indistinguishable from the calcified ones. Both are dark brown in colour, due to an excess of carbon. The structure of the phosphatised siphuncle does not closely replicate the structure of its organic elements. This casts doubts on conclusions of other authors who described a complex porous structure in ammonite siphuncles, which is completely dissimilar to the siphuncular structure of Recent Nautilus and suggests that this organ functioned differently in ammonites. SEM observations using a BSE detector on the calcified parts of the walls of connecting rings revealed a multilayered structure with perpendicular elements connecting particular layers, resembling the structure of a stacked nacreous layer.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exceptional cameral deposits in a sublethally injured Carboniferous orthoconic nautiloid from the Buckhorn Asphalt Lagerstatte in Oklahoma, USA
    Autorzy:
    Seuss, B.
    Mapes, R.H.
    Klug, C.
    Nutzel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22348.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    cameral deposit
    Carboniferous
    orthoconic nautiloid
    Buckhorn Asphalt
    Oklahoma
    USA
    Nautiloidea
    Pseudorthoceratidae
    predation
    sublethal damage
    Opis:
    The cameral and intrasiphonal deposits of a Pennsylvanian straight nautiloid (Pseudorthoceratidae) are studied in order to understand the formation of these deposits. The specimens from the Buckhorn Asphalt deposit (Oklahoma) are exceptionally preserved including original aragonite and microstructures. The specimen investigated survived a predation attempt and shows bite marks on the phragmocone. This is the second report of an ectocochleate cephalopod and first report of an orthoconic nautiloid which survived massive damage of conch and siphuncle. For the first time, a high−magnesium calcitic mineralogy of cameral deposits is documented. These deposits were formed in alternation with aragonite in a chamber which was perforated during the unsuccessful predation attempt. The animal formed the chamber deposits throughout its entire lifetime and the siphuncle played a major role in formation of the cameral deposits.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Campanian [Late Cretaceous] nautiloids from Sakhalin, Far East Russia
    Autorzy:
    Wilmsen, M
    Yazykova, E.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/20899.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Nautiloidea
    nautiloid
    Cymatoceras
    Sakhalin
    Cretaceous
    Late Cretaceous
    ammonite
    Russia
    Cymatoceras pseudoatlas
    paleontology
    invertebrate group
    Opis:
    Three nautiloid taxa, Cymatoceras pseudoatlas (Yabe and Shimizu, 1924b), C. cf. bifidum Shimansky, 1975, and C. cf. honmai Matsumoto and Miyauchi, 1983, are recorded from the Campanian of Sakhalin, Far East Russia. These are the first biostratigraphically well dated nautiloids from Sakhalin, which show close affinities to nautiloid faunas from Japan (Hokkaido), the two areas having formed part of a southerly palaeobiogeographical subprovince of the North Pacific Province. Possible relationships between shell form/ornament and preferred habitats of Late Cretaceous nautiloids are discussed. Coarsely ribbed (“cymatoceratid”), depressed nautiloids seem to predominate in nearshore environments. This may be regarded as an adaptive response to increasing predation pressure by durophages, especially in shallow water settings, which may have triggered the development of defensive morphologies (i.e., ornamented, predation−resistant shells) in Cretaceous shallow−water nautiloids.
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft-tissue attachment structures and taphonomy of the Middle Triassic nautiloid Germanonautilus
    Autorzy:
    Klug, C
    Lehmkuhl, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/21103.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    soft tissue attachment
    Nautiloidea
    nautiloid
    Triassic
    structure
    conch
    taphonomy
    Germany
    Middle Triassic
    paleoecology
    Germanonautilus
    paleontology
    Opis:
    New examinations of numerous steinkerns of the Middle Triassic nautiloid Germanonautilusfrom southern Germany revealed new anatomic, ecologic, and taphonomic details, which are compared with Recent Nautilus. The attachment structures of the cephalic retractor muscle (large scar) and of the dorsal (black layer) and the posterior mantle (posterior narrow scar, anterior band scar of the mantle and septal myoadhesive bands), some with tracking bands (recording the anteriorward movement of the soft body during ontogeny), were seen in several specimens. The shape and proportions of these soft−tissue attachment structures resemble those of Recent Nautilus macromphalus and indicate a similar soft part anatomy. Based on their conch geometry, the mode of locomotion of Germanonautilus is reconstructed. Owing to the wide whorl cross section and the high whorl expansion rate, drag of the conchs was high, the aperture was oriented at an oblique angle which made Germanonautilus a rather slow horizontal swimmer. Because of their large sizes and widths, conchs of Germanonautilus were often deposited on their broad venters, forming elevated “benthic islands” (secondary hardgrounds). A broad range of animals (fish, decapods, ophiurans, crinoids, brachiopods, bryozoans, bivalves, Spirorbis, foraminiferans) lived in and on these comparatively large secondary hardgrounds.
    Źródło:
    Acta Palaeontologica Polonica; 2004, 49, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional morphology and taphonomy of nautiloid beaks from the Middle Triassic of Southern Germany
    Autorzy:
    Klug, C
    Powiązania:
    https://bibliotekanauki.pl/articles/22638.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Muschelkalk
    taphonomy
    beak
    Germany
    Upper Muschelkalk
    Middle Triassic
    Germanonautilus
    Conchorhynchus avirostris
    Triassic
    Rhyncholithes hirundo
    fossil
    rhyncholith
    living chamber
    nautiloid beak
    deposit
    paleontology
    Nautilus
    functional morphology
    paleozoology
    Opis:
    New records of nautiloid beak elements conventionally classified as 'Rhyncholithes hirundo (Biguet, 1819)' and 'Conchorhynchus avirostris (von Schlotheim, 1820)' with carbonised (originally chitinous) three-dimensionally preserved appendages from the Upper Muschelkalk (Middle Triassic) of northern Württemberg (Southwest Germany) enable restoration of the complete beak of Germanonautilus. In three specimens, the lower mandible is embedded within the living chamber of Germanonautilus conchs, Beak elements of Germanonautilus differ from those of Recent Nautilus in the more elongate appendages of the fossil lower mandibles and the weaker sculpture on the originally chitinous parts. Furthermore, the dorsal sculpture of the fossil conchorhynchs consists of ridges rather than denticles and the ventral sculpture of the fossil rhyncholiths displays ridges in places where the Recent rhyncholiths have a smooth surface. Additionally, the fossil beak elements attained a larger size than their Recent counterparts, During transport of 'Rhyncholithes hirundo', the light chitinous parts served as a sail and the heavier conchorhynch anchored in the sediment causing alignment. In contrast to the irregularly embedded isolated rhyncholiths, the conchorhynchs usually settled with their ventral side up. From the study of 407 fossil nautiloid beak-elements, a significant variability of the hard parts is evident. Consequently, the assignment of specific morphologies to the species of Germanonautilus is impossible.
    Zrekonstruowano aparat szczękowy łodzika z rodzaju Germanonautilus wykorzystując nowe materiały z górnego wapienia muszlowego (środkowy trias) północnej Wirtembergii (południowo-zachodnie Niemcy). Opisane elementy aparatu szczękowego Germanonautilus, tradycyjnie klasyfikowane jako „Rhyncholites hirundo (Biguet, 1819)” oraz „Conchorhynchus avirostris (von Schlotheim, 1820)”, są dobrze zachowane, niekiedy ze zwęglonymi, pierwotnie chitynowymi wyrostkami. Trzy okazy dolnej szczęki znaleziono w komorze mieszkalnej Germanonautilus, co potwierdza powiązanie opisanych elementów aparatu szczękowego z tym rodzajem łodzika. W porównaniu ze współcześnie żyjącym łodzikiem z rodzaju Nautilus, elementy dolnej szczęki Germanonautilus mają bardziej wydłużone wyrostki i mniej wydatne urzeźbienie części pierwotnie organicznych, oraz urzeźbienie grzbietowej części elementów zmieneralizowanych (konchorynchów) w postaci grzbiecików, a nie ząbków jak u Nautilus. Pierwotnie organiczne elementy górnej szczęki u Germanonautilus oraz współczesnego łodzika są bardzo podobne, natomiast części zmineralizowane górnych szczęk (ryncholity) Germanonautilus różnią się bardziej rozciągniętą pokrywą oraz wydatną rzeźbą części brzusznej w postaci grzbiecików (u Nautilus element ten jest gładki). W czasie pośmiertnego transportu pierwotnie organiczne i lżejsze elementy górnej szczęki Germanonautilus działały zapewne jak żagiel, natomiast cięższe elementy szczęki dolnej kotwiczyły się w osadzie, powodując doprądową orientacje skamieniałości. Po rozkładzie części organicznych, elementy aparatu ulegały rozproszeniu, jednak o ile ryncholity znajdowane są w osadzie w rozmaitym położeniu, to konchorynchy położone są najczęściej stroną brzuszną do góry.
    Źródło:
    Acta Palaeontologica Polonica; 2001, 46, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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