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    Wyświetlanie 1-13 z 13
    Tytuł:
    Sieve-type normal pore canals in Jurassic ostracods: A review with description of a new genus
    Autorzy:
    Lord, A.R.
    Cabral, M.C.
    Danielopol, D.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082183.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Ostracoda
    Cytheroidea
    normal pore canals
    systematics
    Jurassic
    Cretaceous
    Europe
    Opis:
    Sieve-type normal pore canals (StPC) occur commonly in living and fossil cytheroid ostracods but their biological function(s) and evolutionary history are poorly known. The new genus Minyocythere and its four species: Minyocythere macroporosa sp. nov., M. angulata sp. nov., M. maculosa, and M. tuberculata from the Middle Jurassic have StPC prominently developed, display a range of normal pore canals, and provide a context for review of the geological record and palaeobiological potential of these structures, and their application as a taxonomic tool compared with classical approaches. The related Cretaceous genus Dolocythere is reviewed and Dolocythere amphistiela sp. nov. described. The significance of StPC for comparative morphology, systematics, palaeobiology and environmental interpretation are discussed. The range of normal pore canals observed, including StPC, is greater than previously described and several types can occur on one animal implying different life functions. The potential of normal pore canals especially StPC for systematic use is established although good preservation is essential. The functional significance of normal pore canals and their setae must be verified with living material before their evolutionary history can be deduced and their application to palaeoenvironmental interpretation and modern environmental monitoring enhanced.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 2; 313-349
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Cretaceous symmetrodont mammal Gobiotheriodon from Mongolia and the classification of Symmetrodonta
    Autorzy:
    Averianov, A O
    Powiązania:
    https://bibliotekanauki.pl/articles/20946.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Gobiotheriodon infinitus
    systematics
    classification
    Early Cretaceous
    mammal
    Cretaceous
    Mongolia
    Gobiotheriodon
    paleontology
    Opis:
    The “symmetrodont” mammal, Gobiotheriodon infinitus (Trofimov, 1980), from the Early Cretaceous (Aptian–Albian) of Mongolia, is redescribed.The species is restricted to the holotype only (dentary with three last molars), the referred maxillary fragment with M3? is considered here as cf. Gobiconodon sp.The dental formula of G. infinitusis reinterpreted as i1–3 c1 p1–3 m1–4. G. infinitus is characterized by a short dentary symphysis; long, well−developed Meckel's groove; small, triangular−shaped pterygoid fossa; weakly developed pterygoid crest; i3 enlarged; p1–3 two−rooted; lower molars acute− to obtuse−angled, labial cingulids lacking, lingual cingulids very short, well developed mesial and distal cingulid cuspules (“e” and “d”) and prominent wear surface on the paracristid. Gobiotheriodon is similar to Tinodon (Late Jurassic, USA; Early Cretaceous, Great Britain and Portugal) in postcanine dental formula and structure of the pterygoid fossa; it is provisionally assigned to Tinodontidae Marsh, 1887.Some taxa previously assigned to (or suggested as possible relatives of) “Symmetrodonta” are reviewed.Amphidontidae Simpson, 1925 is considered as nomen dubium.A new classification for “Symmetrodonta” is proposed.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New remains attributable to the holotype of the sauropod dinosaur Neuquensaurus australis, with implications for saltasaurine systematics
    Autorzy:
    D'emic, M.
    Wilson, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/20033.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    Dinosauria
    Sauropoda
    Titanosauria
    Neuquensaurus australis
    Saltasaurus loricatus
    taxonomy
    Cretaceous
    South America
    remains
    new remains
    holotype
    sauropod dinosaur
    dinosaur
    systematics
    saltasaurine systematics
    Opis:
    The Late Cretaceous South American sauropods Neuquensaurus australis and Saltasaurus loricatus are represented by well−preserved and abundant material that has been integral to our understanding of titanosaur anatomy for decades. Although the hypodigms for these species span most of the skeleton, holotypic materials are limited to a few bones that do not overlap between the two taxa. In this contribution, we augment the holotype of Neuquensaurus australis with a partial sacrum that was preserved in articulation with one of the caudal vertebrae from its original description, but not recognised as such at the time. We document this field association via the presence of a broken piece of matrix on the sixth sacral vertebral centrum that has a snap−fit to matrix on the rim of the anterior condyle of the holotypic biconvex vertebra. Based on comparisons with a more complete sacrum and ilium of a referred specimen of Neuquensaurus australis, we interpret this biconvex vertebra to be the seventh sacral vertebra. This raises the possibility that the biconvex “first caudal” vertebra of some other titanosaurs may be part of the sacrum as well. Augmentation of the Neuquensaurus australis holotype to include a sacrum makes it directly comparable to the holotype of Saltasaurus loricatus. Morphological differences in the number, shape, and proportion of sacral vertebrae allow discrimination between Neuquensaurus and Saltasaurus, confirming their generic separation. The El Brete quarry, which preserves the holotypic sacrum and abundant referred specimens of Saltasaurus loricatus, also preserves a sacrum consisting of seven vertebrae that bears autapomorphies of Neuquensaurus australis, indicating that these two saltasaurines coexisted.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New dryolestidan mammal from the Hauterivian–Barremian transition of the Iberian Peninsula
    Autorzy:
    Cuenca−Bescos, G.
    Badiola, A.
    Canudo, J.I.
    Gasca, J.M.
    Moreno-Azanza, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21671.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    dryolestidan mammal
    Hauterivian–Barremian
    Iberian Peninsula
    paleontology
    Mammalia
    Cladotheria
    Dryolestida
    Crusafontia
    systematics
    Cretaceous
    Opis:
    Crusafontia amoae sp. nov. (Dryolestida, Stem Cladotheria) is represented by two isolated upper molars (M4 or M5 and M6 or M7) from the terminal Hauterivian–basal Barremian (Early Cretaceous) of the El Castellar Formation (Galve, Spain). The molars have a deep ectoflexus, a distinct metacone, a continuous metacrista, and an antero−lingually placed paracone. They differ from the molars of the other species of the genus, Crusafontia cuencana, by their larger size, by their outsized parastyle, by the pointed lingual slope of the paracone, their more symmetrical appearance with a deep ectoflexus in occlusal view, and the well−developed metacone. Revision of three isolated teeth previously attributed to Crusafontia cuencana suggests that instead of being upper premolars belonging to Crusafontia cuencana they in fact belong to Pocamus pepelui, of the stem cladotherian superorder Zatheria, probably “peramuran”. As such, the stem Cladotheria record from the Early Cretaceous of the Iberian Peninsula is composed of two dryolestids (Crusafontia amoae and Crusafontia cuencana) and one zatherian (Pocamus pepelui).
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First record of a basal neoceratopsian dinosaur from the Late Cretaceous of Kazakhstan
    Autorzy:
    Averianov, A
    Sues, H.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/23104.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    first record
    neoceratopsian dinosaur
    dinosaur
    Late Cretaceous
    Cretaceous
    Kazakhstan
    systematics
    Aral Sea
    Opis:
    The oldest known ceratopsians come from the Late Jurassic of China (Zhao et al. 1999; Xu et al. 2006). During the Early Cretaceous, the basal ceratopsian Psittacosaurus was among the most common dinosaurs in Asia but more derived basal neoceratopsians were quite rare on that continent (Xu et al. 2002; Makovicky and Norell 2006). Basal neoceratopsians became more abundant in the Late Cretaceous of Mongolia and China, although they are not known in this region from the latest Cretaceous (You and Dodson 2004; Alifanov 2008). In contrast, basal neoceratopsians are rare during the Early Cretaceous in North America but became common and diverse during the Campanian and Maastrichtian (You and Dodson 2004; Chinnery and Horner 2007). Little is known about the evolutionary history of this group in more inland regions of what are now Kazakhstan and adjoining countries. Asiaceratops documents the presence of basal neoceratopsians in the Cenomanian of Uzbekistan (Nessov et al. 1989). Here we report on the first record of a basal neoceratopsian in the Late Cretaceous of Kazakhstan, based on two cranial bones from the Turonian Zhirkindek Formation in the northeastern Aral Sea region.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 3; 553-556
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New psittacosaurid highlights skull enlargement in horned dinosaurs
    Autorzy:
    Sereno, P C
    Xijin, Z.
    Brown, L.
    Lin, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/23127.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Psittacosaurus
    systematics
    Cretaceous
    Dinosauria
    China
    Marginocephalia
    dinosaur
    skull length
    Yixian Formation
    paleontology
    Ornithischia
    Opis:
    A new psittacosaurid is based on a nearly complete articulated skeleton from northeastern China that differs principally in skull size as compared to the most common and widespread species, Psittacosaurus mongoliensis. The skull of Psittacosaurus majorsp. nov., is 25% larger despite very similar postcranial skeletal dimensions. Such selective skull enlargement is very unusual. Skull size in ceratopsians, in general, scales with positive allometry relative to body mass: species of greater mass have proportionately larger skulls. This pattern stands in marked contrast to that for other vertebrate herbivores, in which larger−bodied species either have proportionately similar or smaller skulls relative to body mass. Larger−bodied ceratopsians evolved skulls that are 50% or more of trunk length—as measured without their expansive cranial frill. Although contemporaneous duck−billed dinosaurs also exhibit some positive allometry in the skull, skull length remains approximately 35% of trunk length. The evolution of extraordinary absolute and relative skull size among ceratopsians appears to have been driven by sexual selection and involved the tandem evolution of reduced head mobility and an obligate quadrupedal posture.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new ankylosaurid from the Late Cretaceous Two Medicine Formation of Montana, USA
    Autorzy:
    Penkalski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/945878.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ankylosaur
    Dinosauria
    Ornithischia
    Ankylosauridae
    systematics
    paleontology
    Campanian
    Late Cretaceous
    Cretaceous
    Two Medicine Formation
    Montana
    USA
    Opis:
    Oohkotokia horneri gen. et sp. nov. is described based on a specimen in the collections of the Museum of the Rockies, Montana, USA. Oohkotokia exhibits a unique combination of characters not seen in other late Campanian North American ankylosaurids: prominent, horn-like, trihedral squamosal bosses, a small, undistinguished median nasal plate on the dorsal surface of the rostrum, a relatively small occipital condyle, a smooth, finely pitted osteoderm external texture, and triangular lateral osteoderms. Other specimens from the Two Medicine Formation are referable to Oohkotokia. O. horneri, Euoplocephalus tutus, Dyoplosaurus acutosquameus, and Scolosaurus cutleri separate stratigraphically.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 3; 617-634
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Barremian rhynchonellide brachiopod genus from Serbia and the shell microstructure of Tetrarhynchiidae
    Autorzy:
    Radulovic, B.
    Motchurova-Dekova, N.
    Radulovic, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/20693.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Barremian
    Brachiopoda
    Cretaceous
    paleobiogeography
    Rhynchonellid
    Serbia
    Tetrarhynchiidae
    paleontology
    phylogenetic implication
    rhynchonellid brachiopod
    shell microstructure
    systematics
    taxonomy
    Opis:
    A new rhynchonellide brachiopod genus Antulanella is erected based on the examination of the external and internal morphologies and shell microstructure of “Rhynchonella pancici”, a common species in the Barremian shallow−water limestones of the Carpatho−Balkanides of eastern Serbia. The new genus is assigned to the subfamily Viarhynchiinae, family Tetrarhynchiidae. The shell of Antulanella is small to rarely medium−sized, subglobose, subcircular, fully costate, with hypothyrid rimmed foramen. The dorsal euseptoidum is much reduced. The dental plates are thin, ventrally divergent. The hinge plates are straight to ventrally convex. The crura possess widened distal ends, rarely raduliform or canaliform. The shell is composed of two calcitic layers. The secondary layer is fine fibrous, homogeneous built up of predominantly anisometric anvil−like fibres. Although data on the shell microstructure of post−Palaeozoic rhynchonellides are still incomplete, it is possible to distinguish two types of secondary layer: (i) fine fibrous typical of the superfamilies Rhynchonelloidea and Hemithiridoidea and (ii) coarse fibrous typical of the superfamilies Pugnacoidea, Wellerelloidea, and Norelloidea. The new genus Antulanella has a fine fibrous microstructure of the secondary layer, which is consistent with its allocation in the Hemithiridoidea. Antulanella pancici occurs in association with other brachiopods showing strong Peritethyan affinity and close resemblance to the Jura fauna (= Subtethyan fauna).
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extremely rare Turonian belemnites from the Bohemian Cretaceous Basin and their palaeogeographical importance
    Autorzy:
    Kostak, M.
    Wiese, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/21051.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    rare belemnite
    belemnite
    Turonian
    Turonian belemnite
    Bohemia
    Cretaceous
    paleogeography
    geological setting
    paleontology
    systematics
    Praeactinocamax bohemicus
    Praeactinocamax strehlensis
    Opis:
    New records of extremely rare late Turonian belemnites are described from the Úpohlavy working quarry in the Bohemian Cretaceous Basin. These specimens are referred to Praeactinocamax bohemicus (Stolley, 1916). An alveolar fragment possibly represents Praeactinocamax strehlensis (Fritsch, 1872) and would be the third find of this species ever recorded. All finds derive from a thin horizon in the uppermost part of the Hudcov limestone (Teplice Formation, uppermost Subprionocyclus neptuni Ammonite Zone). The small faunule most likely had its origin in a taxon from the Praeactinocamax manitobensis/walkeri/sternbergi group of the North American Province, and its occurrence in Europe can be seen in the context of a southward shift of Boreal taxa in the course of a late Turonian cooling event.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New blattarians and a review of dictyopteran assemblages from the Lower Cretaceous of Mongolia
    Autorzy:
    Vrsansky, P
    Powiązania:
    https://bibliotekanauki.pl/articles/20184.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    blattarian
    Mantodea
    systematics
    mantis
    paleontology
    dictyopteran
    Isoptera
    Lower Cretaceous
    termite
    geological setting
    Mongolia
    Blattaria
    cockroach
    Opis:
    Dictyopteran assemblages (cockroaches, mantises and termites) from Mongolia were uniform, being composed of the same genera throughout the Early Cretaceous (more than 30 million years), corresponding to the “dry and warm Baissa type” assemblages from Siberia. The assemblage from Shin−Khuduk is exceptional, consisting of a single identifiable blattulid species, Vrtula sama gen. et sp. nov. Assemblages from Eastern Erdenyi−Ula, Khurilt, Kholbotu−Gol, and Shar−Tologoy are composed of species already known from the richest Lower Cretaceous locality Bon Tsagaan, but species representation in the various assemblages differs considerably. Nuurcala srneci sp. nov. from Khurilt Bed 210/24, with a forewing length under 12 mm, is the smallest and best−studied example of the cosmopolitan Mesozoic family Caloblattinidae. The last occurrence of the predominantly Palaeozoic family Phyloblattidae is reported from Bon Tsagaan.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Demandasaurus darwini, a new rebbachisaurid sauropod from the Early Cretaceous of the Iberian Peninsula
    Autorzy:
    Fernandez-Baldor, F.T.
    Canudo, J.I.
    Huerta, P.
    Montero, D.
    Pereda Suberbiola, X.
    Salgado, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/22403.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Demandasaurus darwini
    new species
    rebbachisaurid sauropod
    sauropod
    paleontology
    Early Cretaceous
    Cretaceous
    Iberian Peninsula
    Spain
    Sauropoda
    Rebbachisauridae
    systematics
    paleobiogeography
    Opis:
    A new medium−sized rebbachisaurid sauropod from the Castrillo la Reina Formation (Upper Barremian–Lower Aptian) in Burgos Province, Demandasaurus darwini gen. et sp. nov., is described. It is known from an incomplete but associated skeleton that includes cranial and post−cranial remains. Demandasaurus darwini gen. et sp. nov. presents 9 autapomorphies in the teeth and vertebrae. Demandasaurus is the first diplodocoid sauropod described from the Cretaceous of the Iberian Peninsula. Its inclusion in the Rebbachisauridae is well supported by our phylogenetic hypothesis, which situates it as a sister group of Nigersaurus from the Aptian of Niger, with which it shares various synapomorphies. The discovery of Demandasaurus provides further evidence of the sporadic use of the Apulian Route by dinosaurs during the Early Cretaceous for moving between the south of Europe (Laurasia) and the north of Africa (Gondwana).
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cretaceous braconid wasps from the Magadan Province of Russia
    Autorzy:
    Belokobylskij, S.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/20938.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    braconid wasp
    Magadan province
    Russia
    wasp
    Insecta
    Hymenoptera
    Braconidae
    Protorhyssalinae
    parasitoid
    amber
    phylogenetic relation
    paleontology
    systematics
    Magadanobracon rasnitsyni
    Magadanobracon zherikhini
    new species
    Opis:
    The Cretaceous genera of the hymenopteran family Braconidae are discussed. Overall, eight braconid subfamilies, including two only known from this period, and 17 genera together with two having unclear subfamily position, have been recorded in Cretaceous period. Two new genera, Magadanobracon gen. nov. (with two species, Magadanobracon rasnitsyni sp. nov. and M. zherikhini sp. nov.) and Cretorhyssalus gen. nov. (with type species Cretorhyssalus brevis sp. nov.) are described. The discussed position of the new genera in Protorhyssalinae remains putative owing to a lack of information about multiporous sensillae of the antenna and the poor preservation of the basal half of the hind wing. The earliest recorded thickened hind tibia in the female sex, as a probable apomorphic character of the subfamily Protorhyssalinae, and the evolutionary state of the antefurcal vs. postfurcal positions of the recurrent vein in the fore wing of Braconidae are discussed.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The European Early Cretaceous cryptodiran turtle Chitracephalus dumonii and the diversity of a poorly known lineage of turtles
    Autorzy:
    Perez-Garcia, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/21609.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Europe
    Lower Cretaceous
    cryptodiran turtle
    turtle
    Chitracephalus dumonii
    animal diversity
    Testudines
    Eucryptodira
    Cryptodira
    Cretaceous
    Belgium
    Spain
    synonym
    paleontology
    phylogenetic analysis
    systematics
    holotype
    Salasemys pulcherrima
    Opis:
    Chitracephalus dumonii was named based on some of the most complete turtle remains from the Lower Cretaceous of Europe, and yet the taxon has barely been mentioned since. Indeed, new specimens were erroneously attributed to a new taxon, “Salasemys pulcherrima”. The synonymy is recognized here, and this extends the geographical range of this turtle and provides examples of individuals at different stages of ontogenetic development. The peculiar structure of its shell, and its ontogenetic development, are unique to this taxon. The systematic position of C. dumonii was previously unclear, usually being referred to Testudinata incertae sedis. Here, it is placed in a cladistic analysis, which shows that C. dumonii, and the recently described Hoyasemys jimenezi form part of a Lower Cretaceous European clade of Cryptodira that includes “macrobaenid”, “sinemydid”, and panchelonioidean turtles.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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