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    Wyświetlanie 1-5 z 5
    Tytuł:
    A new genus of patellogastropod with unusual protoconch from Miocene of Paratethys
    Autorzy:
    Anistratenko, O Y
    Bandel, K.
    Anistratenko, V.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/21085.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Tectura zboroviensis
    Miocene
    ontogenesis
    Patellogastropoda
    protoconch
    Tectura pseudolaevigata
    Tectura angulata
    morphology
    teleoconch
    paleontology
    Opis:
    The protoconch and teleoconch morphology of “Tectura” angulata, “Tectura” pseudolaevigata from the Sarmatian and “Tectura” zboroviensisfrom the Badenian of the Eastern Paratethys have been studied in detail for the first time. The new genus Blinia is established for Sarmatian species which are characterized by a protoconch indicative of lecithotrophic type of early development lacking even a short free−swimming larval stage. In contrary the protoconch of Badenian “Tectura” zboroviensis demonstrates features of the shell typical for planktonic larva. The shape and proportions of a pancake−like protoconch in Blinia species suggest the development of young snails in brood pouch in the mantle cavity of maternal individual. The independence of Blinia gen. nov. from other Patellogastropoda such as Tectura, Patella, and Helcion is supported also by characteristics of shell structure. Typical patellogastropod protoconchs are present in the Badenian and the first half of the early Sarmatian and the protoconchs indicating lecithotrophic development are observed in patellogastropods only from the younger half of early Sarmatian and middle Sarmatian deposits. The change in ontogenetic strategy occurred during time of lowered salinity in the Paratethys. We suggest that the snails’ reproductive strategy was modified and free larval life was suppressed to cope with salinity change in the ambient water.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and ontogeny of the Cambrian edrioasteroid echinoderm Cambraster cannati from western Gondwana
    Autorzy:
    Zamora, S.
    Sumrall, C.D.
    Vizcaino, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/21463.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Echinodermata
    Edrioasteroidea
    paleobiology
    Cambrian
    Spain
    France
    morphology
    ontogenesis
    edrioasteroid echinoderm
    echinoderm
    Cambraster cannati
    Gondwana
    Opis:
    A review of the Cambrian edrioasteroid echinoderm Cambraster cannati is made based on new collections from the Iberian Chains (NE Spain) and Montagne Noire (France). New morphological data include a completely articulated oral area and details of ambulacra. Specimens ranging from 4 to 26 mm in diameter provide detailed information concerning the full ontogeny. Important changes through ontogeny mainly affect the marginal ring and the plating pattern of the aboral surface. Comparison with other species of Cambrasterindicates that the aboral surface of Cambraster tastudorum from Australia shows strong resemblance to juvenile specimens of C. cannati. Cambraster cannati was attached directly to the substrate and inhabited relatively high energy, offshore environments from the west margin of Gondwana. Abnormalities in the skeleton are described for the first time in a Cambrian edrioasteroid.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural diversity of the stylophyllid [Scleractinia] skeleton
    Autorzy:
    Stolarski, J
    Russo, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22102.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    stylophyllid
    paleobiology
    Scleractinia
    skeleton
    morphology
    Jurassic
    Stylophyllina
    microstructure
    Haimeicyclus haimei
    ontogenesis
    diversity
    Stylophyllopsis
    deposit
    coral
    solitary coral
    paleontology
    Opis:
    Coralla of the three species of solitary corals described herein from the Sinemurian (Lower Jurassic) of Sicily, i.e., Haimeicyclus haimei (Chapuis and Dewalque, 1853), Stylophyllopsis sp. cf. S. rugosa (Duncan and Wright, 1867), and Stylophyllopsis sp. A., conform to the overall stylophyllid morphology. Their septa consist of spines that are increasingly covered with sclerenchyme and low in the calice form compact blades. The pattern of diagenetic alteration of septa is diverse but consistent within particular taxa. It suggests that the spectrum of the original microstructures is wider than traditionally suggested for stylophyllids. In H. haimei, the septa are covered with dense granulations and completely recrystallized. Granulations also cover septal faces of Stylophyllopsis cf. rugosa and have rod−like foundations. In Stylophyllopsis sp. A., vestiges of the narrow mid−septal zone (similar to that in minitrabecular corals) occur in the proximal part of larger septa, whereas septal spines which are similar to those in Stylophyllopsis cf. rugosa occur in their distal parts. Similar diversity of microstructures is reported also in Triassic stylophyllids that have aragonitic coralla. The presence of distinct septal spines along with wide−ranging microstructural diversity of traditional Triassic–Jurassic stylophyllids, casts light on their possible evolutionary relationships, and can be a useful criterion for further revision of the group. For example, Jurassic thecocyathids, considered ancestral to caryophylliinans, share similar spiny/lobate septa with stylophyllids. Also Recent deep−water anthemiphylliids with spiny/lobate septa are strikingly similar to stylophyllids. Although this may be another example of parallel evolution, the separation of anthemiphylliids from other scleractinian clades on a mitochondrial 16S RNA tree topology suggests their ancient roots and enable us to suggest a stylophyllid ancestry. The supposed cyclic pattern of protoseptal insertion in Early Jurassic H. haimei supports the hypothesis of scleractinian−like (and not rugosan) ancestory of the stylophyllid evolutionary lineage.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early ontogeny and palaeoecology of the Mid-Miocene rissoid gastropods of the Central Paratethys
    Autorzy:
    Kowalke, T
    Harzhauser, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21635.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Miocene
    gastropod
    Mohrensternia pfaffstaettensis
    morphology
    embryonic shell
    Sarmatian
    Mohrensternia hollabrunnensis
    Gastropoda
    ontogenesis
    Caenogastropoda
    rissoid gastropod
    Badenian
    paleoecology
    Rissooidea
    Littorinimorpha
    Opis:
    Twenty−six species of Rissoidae (Caenogastropoda: Littorinimorpha: Rissooidea) are described from the Badenian and Early Sarmatian of 14 localities in Austria and the Czech Republic (Molasse Basin, Styrian Basin, Vienna Basin) and from the Badenian of Coştei (Romania). For the first time, the early ontogenetic skeletal characters of these gastropods are described. Based on these features an indirect larval development with a planktotrophic veliger could be reconstructed for all investigated Mid−Miocene species. The status of Mohrensterniinae as a subfamily of the Rissoidae is confirmed by the morphology of the low conical protoconch, consisting of a fine spirally sculptured embryonic shell and a larval shell which is smooth except for growth lines. Transitions from embryonic shells to larval shells and from larval shells to teleoconchs are slightly thickened and indistinct. Whilst representatives of the subfamily Rissoinae characterise the marine Badenian assemblages, Mohrensterniinae predominate the Early Sarmatian faunas. We hypothesize that this take−over by the Mohrensterniinae was triggered by changes in the water chemistry towards polyhaline conditions. Consequently, the shift towards hypersaline conditions in the Late Sarmatian is mirrored by the abrupt decline of the subfamily. Four new species Rissoa costeiensis (Rissoinae) from the Badenian and Mohrensternia hollabrunnensis, Mohrensternia pfaffstaettensis, and Mohrensternia waldhofensis (Mohrensterniinae) from the Early Sarmatian are introduced.
    Źródło:
    Acta Palaeontologica Polonica; 2004, 49, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pneumaticity and soft-tissue reconstructions in the neck of diplodocid and dicraeosaurid sauropods
    Autorzy:
    Schwarz, D
    Frey, E.
    Meyer, C.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22875.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Dicraeosauridae
    pneumaticity
    cervical ligament
    morphology
    dicraeosaurid sauropod
    diplodocid sauropod
    sauropod
    Diplodocidae
    body length
    muscle
    ontogenesis
    tomography
    soft tissue reconstruction
    cervical musculature
    vertebral pneumaticity
    paleontology
    functional morphology
    Opis:
    The axial soft−tissue system in the neck of Dicraeosauridae and Diplodocidae, including pneumatic diverticula, ligaments, and muscles, is reconstructed on the basis of phylogenetic and functional morphological comparisons with extant crocodylians and birds and compared with other soft−tissue reconstructions for sauropods. Bifurcation of the neural spines separated the paired supraspinal ligament into two sheets. A paired interspinal septum was attached to the cranial and caudal margins of the neural spines. The dorsal and the lateral portions of the cervical musculature must have been strongly segmented, whereas the laterocostal portion was divided with one myoseptum per vertebral segment. The hypaxial cervical muscle was most probably small and only poorly segmented. In Diplodocidae and Dicraeosauridae, the distribution of external pneumatic structures is similar, whereas only Diplodocidae possess intraosseous pneumatic structures. Supravertebral pneumatic diverticula are reconstructed for both groups, which, together with dorsal ligaments filled the gap between the metapophyses of bifurcate neural spines. Comparisons between the vertebrae of juvenile and adult diplodocids strongly indicate that pneumatisation proceeded from the supramedullary diverticula into the neural arch and the neural spine. The regular branching pattern of the pneumatic cavities as well as the vertical I−beam construction of the vertebral corpora is interpreted as a consequence of the biomechanical constraints of the vertebral corpora in diplodocids. These reconstructions form the ground for functional morphological considerations in Diplodocidae and Dicraeosauridae while addressing the possible mechanical consequences of pneumatic structures for the integrity of the support system of the neck.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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