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    Tytuł:
    Olenekian (Early Triassic) fossil assemblage from eastern Julian Alps (Slovenia)
    Autorzy:
    Kolar-Jurkovšek, T.
    Vuks, V. J.
    Aljinović, D.
    Hautmann, M.
    Kaim, A.
    Jurkovšek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/191738.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Olenekian
    Early Triassic
    foraminifers
    bivaves
    gastropods
    conodonts
    sedimentology
    Julian Alps
    Slovenia
    Opis:
    New palaeontological and sedimentological data from the Lower Triassic strata of the eastern Julian Alps in Slovenia are presented., They are unusual for the Early Triassic of the Alps in representing a relatively deeper, unrestricted marine (mid-ramp) setting. There are two basic microfacies types in the section investigated (types A and B), which are organized as couplets with coarse-grained tempestitic deposits (microfacies A), overlain by laminated or bioturbated lime mudstones and/or marls (microfacies B), frequently containing ammonoids. This pattern is interpreted as storm deposition with occasional winnowing of bottom sediments and the formation of coarse-grained skeletal deposits (lags), followed by the slow settling of suspended particles, when the storm waned, in addition to background deposition. Dominantly lime mud deposition and the presence of ammonoids indicate deposition on a more distal, deeper ramp with an unrestricted connection to the open sea. Intense reworking of bottom skeletal-rich sediment and accumulation of storm lags suggest deposition above the storm wave base, possibly in a wide low-energy mid-ramp environment. Faunas from such settings have been reported relatively rarely from the Early Triassic of the Alps. The macrofauna contains ammonoids, bivalves and gastropods, whereas the microfauna is represented by foraminifer tests and conodont elements; rare fish remains also occur. In the foraminifer assemblages, species of Ammodiscus, Hoyenella, Glomospirella dominated, corresponding to the widespread “Glomospira-Glomospirella” foraminifer community, with some miliolids and nodosariids. The conodont fauna is characterized by Triassospathodus hungaricus (Kozur et Mostler), indicating an early Spathian (Olenekian) age. The fossil assemblage highlights the wide distribution of Early Triassic taxa in the Tethys and facilitates its worldwide correlation. Its relatively low diversity by comparison with shallow marine settings is interpreted as an evolutionary proximal-distal trend in the wake of the end-Permian mass extinction. Re-diversification first occurred in nearshore settings and expanded into deeper/distal marine environments through geological time.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2013, 83, 3; 213-227
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The scapulocoracoid of an Early Triassic stem-frog from Poland
    Autorzy:
    Borsuk-Bialynicka, M
    Evans, S.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/20856.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    scapulocoracoid
    Triassic
    Polska
    pectoral girdle
    Anura
    Triadobatrachus
    stem-frog
    Salientia
    Early Triassic
    paleontology
    Czatkowice
    Opis:
    The scapulocoracoid of Czatkobatrachus polonicus Evans and Borsuk−Białynicka, 1998, a stem−frog from the Early Triassic karst locality of Czatkowice (Southern Poland), is described. The overall type of scapulocoracoid is plesiomorphic, but the subcircular shape and laterally oriented glenoid is considered synapomorphic of Salientia. The supraglenoid foramen is considered homologous to the scapular cleft of the Anura. In Czatkobatrachus, the supraglenoid foramen occupies an intermediate position between that of the early tetrapod foramen and the scapular cleft of Anura. The cleft scapula is probably synapomorphic for the Anura. In early salientian phylogeny, the shift in position of the supraglenoid foramen may have been associated with an anterior rotation of the forelimb. This change in position of the forelimb may reflect an evolutionary shift from a mainly locomotory function to static functions (support, balance, eventually shock−absorption). Laterally extended limbs may have been more effective than posterolateral ones in absorbing landing stresses, until the specialised shock−absorption pectoral mechanism of crown−group Anura had developed. The glenoid shape and position, and the slender scapular blade, of Czatkobatrachus, in combination with the well−ossified joint surfaces on the humerus and ulna, all support a primarily terrestrial rather than aquatic mode of life. The new Polish material also permits clarification of the pectoral anatomy of the contemporaneous Madagascan genus Triadobatrachus.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery
    Autorzy:
    Hofmann, R.
    Hautmann, M.
    Wasmer, M.
    Bucher, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/21319.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleoecology
    Spathian Virgin Formation
    Utah
    USA
    Early Triassic
    Triassic
    recovery
    diversity
    biotic recovery
    mass extinction
    Opis:
    The Spathian (late Early Triassic) Virgin Formation of south−western Utah (USA) yields a comparatively diverse benthic fauna that flourished ~2 Ma after the end−Permian mass extinction. In this study, we present quantitative palaeoecological data, which are analysed in the context of depositional environments. This integrated approach helps to discriminate between effects of the end−Permian mass extinction event and local environmental factors on alpha diversity and ecological structure of the Virgin Fauna. Shallow subtidal environments yield the highest species richness and lowest dominance val− ues as recorded in two benthic associations, the Eumorphotis ericiusAssociation and the Protogusarella smithi Association, both ofwhich contain 20 benthic species (bivalves, gastropods, brachiopods, echinoderms, and porifers). Tidal inlet deposits yield a low diverse fauna (Piarorhynchella triassica Association) with a very high dominance of filter feeders adapted to high energy conditions.Another comparably low diverse fauna is recorded by the Bakevellia exporrecta Association, which occurs in deposits of the offshore transition zone,most likely reflecting unconsolidated substrates. A single sample contain− ing five bivalve species (Bakevellia costata Assemblage) is recorded from a marginal−marine setting. The Virgin fauna yields a bulk diversity of 30 benthic species (22 genera) of body fossils and 14 ichnogenera and, thus, represents the most di− verse marine bottom fauna known so far from the Early Triassic. Our results suggest that oceanographic conditions during the early Spathian enabled ecosystems to rediversify without major abiotic limitations. However, taxonomical differentia− tion between habitats was still low, indicating a time lag between increasing within−habitat diversity (alpha diversity) and the onset of taxonomical differentiation between habitats (beta diversity). We suggest that taxonomical habitat differentia− tion after mass extinction events starts only when within−habitat competition exceeds a certain threshold, which was not yet reached in the Spathian of the investigated area. This interpretation is an alternative to previous suggestions that the preva− lence of generalistic taxa in the aftermath of mass extinction events reflects protracted environmental stress. The onset of in− creasing beta diversity is a potential criterion for distinguishing two major recovery phases, the first ending with habitat satu− ration and the second ending with the completion of ecosystem differentiation.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A basal archosauriform from the Early Triassic of Poland
    Autorzy:
    Borsuk-Bialynicka, M
    Evans, S.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/22940.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Osmolskina czatkowiensis
    Polska
    bone
    Middle Triassic
    Early Triassic
    Czatkowice
    basal archosauriform
    geographic distribution
    Early Olenekian
    Archosauriformes
    deposit
    distribution
    paleontology
    Opis:
    Basal Archosauriformes had a wide geographic distribution through the Lower to Middle Triassic. Osmolskina czatkowiensis gen. et sp. nov. from Early Olenekian karst deposits at Czatkowice, west of Cracow, provides the first record from Poland. The reconstructed skull and attributed postcranial elements show a morphology closely resembling that of the Early Anisian African genus Euparkeria Broom, 1913, while differing at generic level. Both genera display the same mosaic of plesiomorphic and apomorphic character states, but share no unique apomorphic character state. They might thus be combined in the family Euparkeriidae Huene, 1920, but could also constitute two plesions of the same grade lying just below the Archosauria + Proterochampsidae node. Currently, Euparkeriidae remains monotypic because no other genus can be assigned to it with confidence. Until this problem is resolved, the term “euparkeriid” essentially denotes a grade of Lower to Middle Triassic non−archosaurian archosauriforms that are more derived than proterosuchid grade taxa, but lack the specializations of either erythrosuchids or proterochampsids. They were probably Pangaean in their distribution.
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new Early Triassic gastropod genus and the recovery of gastropods from the Permian-Triassic extinction
    Autorzy:
    Nutzel, A
    Powiązania:
    https://bibliotekanauki.pl/articles/22642.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    gastropod
    Werfenella
    Alps Mountains
    Purpurinidae
    Werfen Formation
    Olenekian
    new genus
    mass extinction
    Early Triassic
    Triassic
    Gastropoda
    Permian
    Turbo rectecostatus
    paleontology
    Opis:
    The common Early Triassic (Olenekian) gastropod Turbo rectecostatus from the upper Werfen Formation of the Alps is placed in the new genus Werfenella. Elimination of the wrong or outdated generic assignments of Late Palaeozoic and Early Mesozoic gastropods to archetypical genera such as Turbo, Trochus, or Natica (all with Recent type species) represents an important step toward understanding the evolutionary history of the gastropods across the Permian/Triassic mass−extinction event. The first appearance of Werfenella in the Olenekian, as well as the origination of other groups of gastropods, suggests an early turnover in the aftermath of the end−Permian mass extinction event. The relatively large size of Werfenella (up to 35 mm) sheds doubt on assertions that all Early Triassic gastropods are microgastropods (Lilliput effect). The new genus is placed in the caenogastropod family Purpurinidae and represents its earliest occurrence. However, a placement of Werfenella in the Archaeogastropoda (Vetigastropoda) is also possible because it resembles the paraturbinid genus Chartronella. The characteristic Werfenella rectecostata–Natiria costata gastropod association from the Werfen Formation is not found in the approximately contemporaneous Sinbad Limestone of the Moenkopi Formation (Utah, USA) nor elsewhere outside Europe. This suggests that the similarities between Olenekian gastropod faunas from the Tethys and western North America are more limited than previously thought.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowe stanowisko z tropami kręgowców z górnego pstrego piaskowca Gór Świętokrzyskich
    New site with vertebrate footprints from the Upper Buntsandstein of the Holy Cross Mountains, Central Poland
    Autorzy:
    Kuleta, M.
    Niedźwiedzki, G.
    Ptaszyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074383.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    tropy kręgowców
    pstry piaskowiec
    wczesny trias
    Góry Świętokrzyskie
    vertebrate footprints
    Upper Buntsandstein
    Early Triassic
    Holy Cross Mountains
    Polska
    Opis:
    Vertebrate footprints are abundant in the Buntsandstein of the Holy Cross Mountains (central Poland) and have been documented in numer-ous publications. A new site vertebrate trackside has been discovered in near Suchedniów. Chirotheriidae (Synaptichnium sp., Chirotherium barthii, and Brachychirotherium sp.), Rhynchosauroidae (Rhynchosauroides sp.), and probably amphibian footprints (cf. Capitosauroides sp.) are reported from the lower part of the Upper Buntsandstein Baranów Formation (complex of different fluvial deposits) exposed at Kopulak quarry. Differentiated invertebrate ichnofossils (Cruziana problematica, Scoyenia sp., Palaeophycus sp., Skolithos sp., Lockeia sp., and cf. Gordia sp.) and plant remains have been also found in this site. Three types of vertebrate subaqueous traces (footprints of swimming animals) are identified: (1) swim traces - structures preserved as digits or claws scratches; (2) partially preserved pes or manus imprints; (3) other enigmatic traces -referred to as “problematic forms”.
    Źródło:
    Przegląd Geologiczny; 2005, 53, 2; 151--155
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new large capitosaurid temnospondyl amphibian from the Early Triassic of Poland
    Autorzy:
    Sulej, T.
    Niedzwiedzki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/21788.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new genus
    large capitosaurid amphibian
    Early Triassic
    Triassic
    Polska
    temnospondyl amphibian
    Temnospondyli
    Capitosauridae
    Buntsandstein
    Spathian
    Olenekian
    Holy Cross Mountains
    paleontology
    deposit
    anatomy
    Opis:
    The Early Triassic record of the large capitosaurid amphibian genus Parotosuchus is supplemented by new material from fluvial deposits of Wióry, southern Poland, corresponding in age to the Detfurth Formation (Spathian, Late Olenekian) of the Germanic Basin. The skull of the new capitosaurid shows an “intermediate” morphology between that of Paroto− suchus helgolandicus from the Volpriehausen−Detfurth Formation (Smithian, Early Olenekian) of Germany and the slightly younger Parotosuchus orenburgensis from European Russia. These three species may represent an evolutionary lineage that underwent a progressive shifting of the jaw articulation anteriorly. The morphology of the Polish form is dis− tinct enough from other species of Parotosuchus to warrant erection of a new species. The very large mandible of Parot− osuchus ptaszynskii sp. nov. indicates that this was one of the largest tetrapod of the Early Triassic. Its prominent anatomi− cal features include a triangular retroarticular process and an elongated base of the hamate process.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przystropowa seria klastyczna pstrego piaskowca dolnego i środkowego jako zapis transgresji morskiej z zachowaniem ciągłości sedymentacji we wczesnym triasie synkliny grodzieckiej, Sudety
    The uppermost clastic succession of the Lower-Middle Buntsandstein as a record of continous sedimentation during Early Triassic transgression in the Grodziec Syncline area, Sudetes
    Autorzy:
    Durkowski, K.
    Sokalski, D.
    Durkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061782.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    synklina grodziecka
    seria klastyczna
    pstry piaskowiec
    piaskowiec kaolinitowy
    transgresja wczesnotriasowa
    Grodziec Syncline
    clastic succession
    Buntsandstein
    kaolinitic sandstone
    Early Triassic transgression
    Opis:
    Przystropowa seria klastyczna dolnego i środkowego pstrego piaskowca z obszaru synkliny grodzieckiej synklinorium północnosudeckiego charakteryzuje się dużym makroskopowym podobieństwem do klastycznych utworów cenomanu. Mogło to skutkować błędnym wyznaczaniem granicy między utworami triasu i kredy w otworach archiwalnych. Przeprowadzono szczegółowe obserwacje makroskopowe rdzeni wiertniczych oraz pobrano próbki do analiz mikroskopowych. Wyróżniono szereg cech charakteryzujących piaskowce serii stropowej. Są to przede wszystkim: podwyższona zawartość kaolinitu, spadek dojrzałości teksturalnej, zanik warstwowań, brak występowania otoczaków oraz intraklastów ilastych. Cechy te mogą wskazywać na transgresywny charakter osadu oraz przejściowe (z lądowego do morskiego) środowisko ich powstawania.
    The uppermost clastic succession of Lower–Middle Buntsandstein sediments of the Grodziec Syncline (North Sudetic Synclinorium) shows high macroscopic similarity to overlying Cenomanian deposits. That might have resulted in erroneous determination of the boundary between Triassic and Cretaceous sediments in historic drill holes. Detailed macroscopic observations were performed on cores and samples taken for microscopic analyses. A number of features characterizing sediments of the uppermost clastic succession have been identified. These are predominantly increased kaolinite content, decrease of textural maturity, decline of bedding, and lack of pebbles and argillaceous intraclasts. These features might indicate transgressive character of the sediments and deposition in a transitional, terrestrial to marine environment.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2017, 469; 129--153
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The brachyopoid Hadrokkosaurus bradyi from the early Middle Triassic of Arizona, and a phylogenetic analysis of lower jaw characters in temnospondyl amphibians
    Autorzy:
    Ruta, M.
    Bolt, J.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/21195.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    brachyopoid
    Hadrokkosaurus bradyi
    Early Middle Triassic
    Triassic
    Arizona
    phylogenetic analysis
    lower jaw
    temnospondyl amphibian
    amphibian
    Temnospondyli
    Chigutisauridae
    evolution
    paleontology
    holotype
    Opis:
    The holotype of the brachyopoid temnospondyl Hadrokkosaurus bradyi, represented by a right lower jaw ramus, is re−examined based upon new data and revision of various morphological features. Additional fragmentary jaw material referred to this species is briefly described. Prominent features are a large postsymphyseal foramen that is anteriorly open, and prearticular and surangular buttresses for support of the articular. Brachyopoid characters include a long and robust postglenoid area formed by surangular and prearticular, anterior and posterior keels on at least some marginal dentary teeth, and subtriangular outline of the adductor fossa in dorsal view. Five features of the holotype ramus, long thought to be at odds with its brachyopoid or temnospondyl nature, are critically re−evaluated. A phylogenetic analysis of lower jaw characters in temnospondyls retrieves most of the clades found in more comprehensive data sets, but the statistical node support is low. Brachyopoids are monophyletic, with Hadrokkosaurus emerging as their most basal taxon.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeomagnetism of Permian through Early Triassic sequences in central Spitsbergen: contribution to magnetostratigraphy
    Autorzy:
    Nawrocki, J.
    Grabowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059421.pdf
    Data publikacji:
    2000
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Spitsbergen
    Permian-Early
    Triassic
    magnetostratigraphy
    correlation
    Opis:
    A total of 297 samples for palaeomagnetic studies were collected from Upper Gzhelian through Spathian sediments of the Isfjorden area (central Spitsbergen). In spite of extensive Cenozoic remagnetisation the studied rocks yielded palaeomagnetic poles and magnetostratigraphy. Almost all Permian samples were reversely magnetised during Kiaman superchron. Normal-polarity samples appear in the Ufimian and Kazanian sediments. The topmost samples from the Kapp Starostin Formation (Upper Permian) contain reverse polarity. The magnetic polarity record noted in the Early Triassic (Griesbachian-Spathian) sequences is fully convergent with magnetic polarity schemes obtained in the Canadian Arctic and Deltadalen type section.
    Źródło:
    Geological Quarterly; 2000, 44, 2; 109-117
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aszulcicrinus, a new genus of the Triassic crinoid family Dadocrinidae (Articulata; Encrinida) from Poland
    Autorzy:
    Hagdorn, Hans
    Powiązania:
    https://bibliotekanauki.pl/articles/1836258.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Crinoidea
    Middle Triassic
    early Anisian
    Upper Silesia
    functional morphology
    taphonomy
    Opis:
    The new genus and species Aszulcicrinus pentebrachiatus of the family Dadocrinidae from the ear-ly Middle Triassic Lower Gogolin Formation of Upper Silesia Upland is described. In contrast to Dadocrinus, the second primibrachial of Aszulcicrinus is not axillary for articulation with two arms but articulates with a third primibrachial and the first pinnule. This character results in five unbranched arms, which is unique in the order Encrinida. The significance of this character is discussed and paedomorphic or ecophenotypic explanations are excluded. The presence of only five unbranched arms predominates through the ontogeneny of Aszulcicrinus from early postlarval to adult stage. Within the family Dadocrinidae (Aszulcicrinus - Dadocrinus - Carnallicrinus), a phylogenetic trend towards size increase coincident with increasing arm number and denser pinnulation is inter-preted as an improvement in filter-feeding efficiency. The sedimentological and taphonomic setting of the obru-tional conservation lagerstätte of the type locality is described.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2020, 90, 4; 381-390
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Postcranial osteology of the first early-stage juvenile skeleton of Plateosaurus trossingensis from the Norian of Frick, Switzerland
    Autorzy:
    Nau, D.
    Lallensack, J.N.
    Bachmann, U.
    Sander, P.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082237.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Dinosauria
    Sauropodomorpha
    morphometrics
    morphology
    small body size
    early ontogeny
    Triassic
    Swiss Plateau
    Opis:
    Owing to monospecific mass-accumulation sites in Central Europe, the early-branching sauropodomorph Plateosaurus has one of the best fossil records among dinosaurs. Despite this, early-stage juveniles have been conspicuously absent. However, such specimens are critical in assessing the ontogenetic development of this taxon, as well as the role of heterochrony in sauropodomorph evolution. A new skeleton from the Plateosaurus bonebed at the Gruhalde Quarry (Klettgau Formation, Norian) of Frick, Switzerland, nicknamed “Fabian”, represents the first substantially complete juvenile referrable to Plateosaurus. The specimen includes large portions of the cranium and vertebral column and an almost completely represented appendicular skeleton. Its juvenile ontogenetic stage is confirmed by a lack of neurocentral suture fusion in the axial skeleton. Consistent with this, the estimated total length and body mass of approximately of 2.3 m and 40 kg are considerably smaller than any previously reported specimen of the genus. Surprisingly, the postcranial morphology of the specimen is remarkably consistent with that of osteologically mature individuals, including a virtually fully developed pattern of laminae and fossae in the vertebrae. Comparisons of body proportions are complicated by varying degrees of compaction in the limb elements, but skeletal proportions mostly appear to follow isometry, with the notable exceptions of a relatively long neck, proportionately larger manus, shorter, more gracile humerus and shorter forearm in the juvenile specimen. The observed morphology suggests that adult morphology was either achieved early in ontogeny of Plateosaurus, or alternatively that developmental plasticity, which has previously been found to result in high variability of adult body size, could potentially also extend to morphological development.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 4; 679-708
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Norian (Triassic) corals from the Northern Calcareous Alps, Austria, and the intra-Norian faunal turnover
    Autorzy:
    Roniewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/20215.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Early Norian
    Triassic
    coral
    Alps Mountains
    Austria
    faunal turnover
    paleontology
    Scleractinia
    Hexanthiniaria
    taxonomy
    Norian
    Dachstein
    Tethys
    Opis:
    The first description of early Norian coral fauna from the Northern Calcareous Alps (Dachstein Plateau and Gosaukamm), Austria, is presented: 31 scleractinian species from 24 genera (including three corals not formally determined), and three hexanthiniarian species belonging to two genera. The stratigraphical position of the main part of the fauna discovered in the South Dachstein Plateau at the Feisterscharte is determined by means of the conodont Epigondolella quadrata (Lacian 1); single finds are from the horizons with Epigondolella triangularis and Norigondolella navicula (Lacian 3), and one close to the horizon with Epigondolella cf. multidentata (Alaunian 1). Rare corals from the Gosaukamm are from the Lacian 1 and Alaunian. Five species are described as new: Retiophyllia vesicularis, Retiophyllia aranea, Margarosmilia adhios, Hydrasmilia laciana; one new genus and species from the family Coryphylliidae, Margarogyra hirsuta; one new genus and species, Thamnasterites astreoides, cannot be assigned to a family. Two hexanthiniarian species, Pachysolenia cylindrica and Pachydendron microthallos, known exclusively from the Tethyan lower Norian, represent stratigraphically valuable species. A regularly porous coral from the family Microsolenidae, Eocomoseris, which up to now has only been known from the Jurassic and Cretaceous, is here identified from the Triassic strata (originally described as Spongiomorpha [Hexastylopsis] ramosa). Predominant taxa show solitary and phaceloid (pseudocolonial) growth forms and an epithecal wall; pennules−bearing corals are common. Carnian genera and genera typical of the Lacian and Lacian–early Alaunian prevail; a hydrozoan genus Cassianastraea has also been encountered as well as a scleractiamorph coral, Furcophyllia septafindens). The faunal composition contrasts with that of well known late Norian–Rhaetian ones, the difference being observed not only at the generic but also at the family level. The post−early Norian change in coral spectrum documents the turnover of the coral fauna preceding that at the Triassic/Jurassic boundary.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Earliest Jurassic patellogastropod, vetigastropod, and neritimorph gastropods from Luxembourg with considerations on the Triassic–Jurassic faunal turnover
    Autorzy:
    Monari, S.
    Valentini, M.
    Conti, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/20922.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Early Jurassic
    Jurassic
    patellogastropod
    vetigastropod
    neritimorph gastropod
    gastropod
    Luxembourg
    Triassic
    fauna
    paleontology
    Gastropoda
    paleobiogeography
    Hettangian
    Luxembourg Sandstone Formation
    Paris Basin
    Opis:
    The Hettangian to earliest Sinemurian Vetigastropoda, Patellogastropoda, and Neritimorpha housed in the National Museum of Natural History of Luxembourg are studied. Most of the species comes from the Luxembourg Sandstone Formation. This deposit formed along the southern margin of the London−Brabant−Ardennes Landmass, in a region that during the earliest Jurassic constituted a seaway connecting the Paris Basin with the epicontinental seas of the Netherlands and northern Germany. The systematic analysis revealed high diversity of the studied fauna; we identified twenty−two species, eleven genera, nine families, and six superfamilies. A new genus, Meiersia gen. nov., and three new species, Anodomaria schroederi sp. nov., Meiersia disarmata sp. nov., and Spirocirrus weisi sp. nov. are described. The fauna is dominated by pleurotomarioideans representing the genera Ptychomphalus, Pleurotomaria, and Trochotoma, and by the patellogastropod genus Scurriopsis both in number of species and specimens. The neritimorph genus Neridomus is also well represented. Among the accessory taxa, Anodomaria and Spirocirrusfirst appeared in the Late Hettangian of the Luxembourg area. Most of these genera show a species radiation in the Early Jurassic and are distributed over the western European epicontinental shelf, probably favoured by an east to west marine transgression which influenced wide areas from the basins of the northern Germany to the Paris Basin through the Luxembourg seaway. The evolutionary and palaeobiogeographical data demonstrate that this radiation was already considerably advanced in the Late Hettangian. This suggests that the recovery of the gastropod diversity after the end−Triassic crisis was relatively fast in western Europe.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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