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    Wyświetlanie 1-4 z 4
    Tytuł:
    New material and reinterpretation of the Late Cretaceous eutherian mammal Paranyctoides from Uzbekistan
    Autorzy:
    Averianov, A.O.
    Archibald, J.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/22276.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    reinterpretation
    Late Cretaceous
    Cretaceous
    paleontology
    eutherian mammal
    mammal
    Mammalia
    Eutheria
    Paranyctoides aralensis
    Turonian Bissekty Formation
    Uzbekistan
    Opis:
    Paranyctoides aralensis, based on a partially known set of lower postcanines from the Turonian Bissekty Formation of Uzbekistan, is proposed to be a junior subjective synonym of Sailestes quadrans, itself based on an M1 from the same stratigraphic unit. As a result, the latter taxon is recombined as Paranyctoides quadrans comb. nov. Based on newly col− lected or recognized specimens, we show that this species has four lower incisors, including a procumbent i1 and a rela− tively small i4, as well as five double−rooted premolars, the smallest of which (p3) can be lost ontogenetically. The p5 of this species is premolariform, rather than molariform as previously thought based on an erroneous identification, and re− sembles North American species of Paranyctoides in the presence of a small, cingulid−like paraconid and a distal talonid cusp, as well as the absence of a metaconid. The lower molars of Paranyctoides are unique among Late Cretaceous eutherians in having a larger, lingually placed paraconid. Paranycoides probably is the sister taxon of the Late Cretaceous Zhelestidae.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New specimens of the multituberculate mammal Uzbekbaatar from the Late Cretaceous of Uzbekistan
    Autorzy:
    Averianov, A O
    Archibald, J.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/22995.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    multituberculate
    new specimen
    mammal
    Cretaceous
    Late Cretaceous
    Uzbekistan
    Uzbekbaatar kizylkumensis
    paleontology
    Opis:
    Uzbekbaatar Kielan−Jaworowska and Nessov, 1992 is among the rarest mammals and the only multituberculate in the diverse, eutherian dominated Bissekty (Turonian) and Aitym (?Coniacian) local faunas, Kyzylkum Desert, Uzbekistan. New material from the Bissekty local fauna, suggests that only one multituberculate species, Uzbekbaatar kizylkumensis Kielan−Jaworowska and Nessov, 1992 is present in the Bissekty fauna. A newly collected p4 is better preserved than the holotype and demonstrates presence of the posterolabial cusp in the p4 of Uzbekbaatar. New material of Uzbekbaatar is consistent with placement of this taxon within the basal cimolodontan “Paracimexomys group.”
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Petrosal bones of placental mammals from the Late Cretaceous of Uzbekistan
    Autorzy:
    Ekdale, E G
    Archibald, J.D.
    Averianov, A.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/21735.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    mammal
    petrosal bone
    Cretaceous
    Late Cretaceous
    Kulbeckia kulbecke
    Uzbekistan
    Mammalia
    bone
    Bissekty Formation
    deposit
    Kulbeckia
    paleontology
    Opis:
    Petrosal bones representing “Zhelestidae” and Kulbeckia (“Zalambdalestidae”) were recovered from the Late Cretaceous of Uzbekistan and are formally described. The “zhelestid” petrosal retains several characters ancestral to eutherians (if not more basally in the mammalian phylogeny),including a prootic canal,a lateral flange,and a less elliptical fenestra vestibuli. The only other eutherian taxon to retain these structures is the Early Cretaceous Prokennalestes. No characters unique to “zhelestids” and ungulates were found in the “zhelestid” petrosal. The petrosal of Kulbeckia shares several characters in common with other “zalambdalestids” (such as Zalambdalestes and Barunlestes),as well as Asioryctes and Kennalestes,including a curved ridge connecting the crista interfenestralis to the caudal tympanic process,and presence of a “tympanic process” at the posterior aspect of the petrosal.
    Źródło:
    Acta Palaeontologica Polonica; 2004, 49, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Therian femora from the Late Cretaceous of Uzbekistan
    Autorzy:
    Chester, S.G.B.
    Sargis, E.J.
    Szalay, F.S.
    Archibald, J.D.
    Averianov, A.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/20995.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Theria
    femur
    Late Cretaceous
    Uzbekistan
    Metatheria
    Eutheria
    Zhelestidae
    Zalambdalestidae
    Cretaceous
    paleontology
    Opis:
    Femora referable to metatherians and eutherians recovered from the Bissekty Formation, Dzharakuduk, Kyzylkum Desert, Uzbekistan (90 Mya), are described. Fourteen isolated specimens were sorted based on size and morphology into groups that likely correspond to the species level or higher. Groups were then tentatively assigned to taxa known from teeth, petrosals, and/or other postcrania at these localities. One distal femur of a small arboreal metatherian, and several eutherian distal femora that probably represent zhelestids and/or zalambdalestids were identified. With the exception of one proximal femur that is similar in some aspects to the zalambdalestid Barunlestes, and a previously described multituberculate specimen, all other proximal femora from the Bissekty Formation exhibit a metatherian−like morphology. The dental record currently suggests the presence of twelve eutherian species and only one metatherian at Dzharakuduk, whereas the humeral and crurotarsal evidence supports the presence of at least two or four metatherian species, respectively. Given the sample size of the proximal femora, the morphological diversity present, and the overwhelming presence of eutherians at these localities, it is highly unlikely that the overwhelming majority of proximal femora actually represent metatherians. Therefore, this sample may suggest that the metatherian proximal femoral condition is primitive for Theria and that some eutherian taxa (probably including Zhelestidae, which are dentally most abundant at these localities) retain this condition.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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