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    Wyświetlanie 1-3 z 3
    Tytuł:
    Kielantherium, a basal tribosphenic mammal from the Early Cretaceous of Mongolia, with new data on the aegialodontian dentition
    Autorzy:
    Lopatin, A
    Averianov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/23180.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Kielantherium gobiense
    Early Cretaceous
    mammal
    dentition
    Cretaceous
    Mammalia
    Mongolia
    Aegialodontia
    Tribosphenida
    tribosphenic mammal
    paleontology
    Opis:
    Two additional specimens of the basal tribosphenid mammal Kielantherium gobiense, the first known aegialodont upper molar (possibly M2) and a dentary fragment with m1, are described from the Early Cretaceous Höövör locality in Mongolia. The upper molar shows an initial stage of the protocone development. Kielantherium gobiense has been known from two specimens only, and thus the new material doubles the hypodigm of this species. Kielantherium is clearly not a junior synonym of Aegialodon, as it differs from the latter in having a cusp−like mesiolabial cingulid cuspule f rather than prominent ridge−like precingulid. Kielantherium's lower postcanine dental formula (with four or more premolars and four molars) is distinctive and more primitive than in Peramus and Eutheria which have five premolars and three molars, and Metatheria which have three premolars and four molars.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revision of a pretribosphenic mammal Arguimus from the Early Cretaceous of Mongolia
    Autorzy:
    Lopatin, A
    Averianov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/23163.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Early Cretaceous
    mammal
    locality
    Cretaceous
    Arguimus khosbajari
    tooth
    Mongolia
    Arguitherium cromptoni
    Arguimus
    identification
    pretribosphenic mammal
    Arguitherium
    paleontology
    Opis:
    Arguimus khosbajari is redescribed, based on five additional specimens from the topotypic Early Cretaceous (Aptian– Albian) Höövör locality in Mongolia. The teeth preserved in the holotype of A. khosbajari are interpreted as p4–5, m1–3. The original identification of the teeth preserved in the holotype and single specimen of Arguitherium cromptoni from Höövör as p4–5, m1 is confirmed and this specimen is considered conspecific with A. khosbajari. Thus Arguitherium cromptoni Dashzeveg, 1994 and Arguitheriidae Dashzeveg, 1994 are junior subjective synonyms of Arguimus khosbajari Dashzeveg, 1979 and Arguimuridae Dashzeveg, 1994 respectively (syn. nov.). Arguimus is a stem−lineage zatherian characterized by the lower postcanine formula p1–5, m1–4, a premolariform p5, a “partially molariform” m1 having a widely open trigonid basin, trigonid cusps less angulated than in m2–4, a low and small paraconid, and a small but distinct metaconid, a single cusped talonid with an incipient talonid basin on m1–4, a distinct labial mandibular foramen, and total lack of the Meckel’s groove. A similar “partially molariform” m1 was apparently characteristic also for the stem−lineage zatherian Nanolestes from the Late Jurassic of Portugal, based on reinterpretation of the isolated tooth Gui Mam 1005, considered previously to be a deciduous premolar, and for Chunnelodon from the Early Cretaceous of England, described originally as an indeterminate dryolestoid, but referred here to as a stem−lineage zatherian.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skull structure in Catopsbaatar and the zygomatic ridges in multituberculate mammals
    Autorzy:
    Kielan-Jaworowska, Z
    Hurum, J.H.
    Lopatin, A.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/22747.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    mammal
    Cretaceous
    Gobi Desert
    Catopsbaatar catopsaloides
    zygomatic ridge
    Kryptobaatar
    multituberculate
    Djadochtatherium
    Djadochtatheriidae
    Mammalia
    Campanian
    paleontology
    Multituberculata
    Opis:
    The late Campanian djadochtatherioid multituberculate Catopsbaatar catopsaloides was originally known from three skulls from Hermiin Tsav in the Gobi Desert (Mongolia). Three more skulls from Hermiin Tsav are now available, associated with parts of the previously unknown postcranial skeleton, which will be described separately. We describe herein the skull and dentition of C. catopsaloides, based on all available material, housed in PIN, PM, and ZPAL collections. The genera Catopsbaatar, Djadochtatherium, and Kryptobaatar share several characters, unknown in Tombaatar, such as very long postorbital processes directed postero−laterally and downwards, parietal ridges extending from the posterior margins of the postorbital processes postero−medially, and nuchal crests with prominent lateral wings, incurved anteriorly in the middle, so that the skull in dorsal view is shorter in the middle than laterally. Catopsbaatar shares with Djadochtatherium a very high and prominent anterior zygomatic ridge, and presence of the masseteric protuberance, but differs from it and from other djadochtatherioid genera in having the orbit situated more posteriorly, the intermediate zygomatic ridge adhering to the anterior ridge, and a smaller trapezoidal (rather than crescent−shaped) p4 without ridges; it differs from Kryptobaatar and Djadochtatherium in having three upper premolars (P2 being lost) and shares this last character with Tombaatar. Catopsbaataris known not only from Hermiin Tsav, but also from Baruungoyot Formation of Khulsan, represented there by a single m2. We demonstrate that the separation of the masseter superficialis into two parts, the origins of which leave scars on the lateral wall of the zygomatic arch surrounded by zygomatic ridges, occurs in all the multituberculates (beginning with Paulchoffatiidae), and is regarded as a multituberculate autapomorphy.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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