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    Tytuł:
    Redescription of neoceratopsian dinosaur Archaeoceratops and early evolution of Neoceratopsia
    Autorzy:
    You, H
    Dodson, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/21113.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    Archaeoceratops
    China
    Dinosauria
    neoceratopsian dinosaur
    Mazongshan area
    evolution
    dinosaur
    Gansu Province
    Neoceratopsia
    Archaeoceratops oshimai
    paleontology
    Opis:
    Archaeoceratops oshimai Dong and Azuma, 1997 is a basal neoceratopsian from the late Early Cretaceous of Mazongshan area, Gansu Province, northwest China. Here we provide a detailed description on Archaeoceratops oshimai based on both the holotype, which consists of a well preserved, nearly complete skull, partial vertebral column, and partial pelvis, and the paratype, which consists of a partial vertebral column including a nearly complete tail, a partial pelvis, fragmentary hind limb bones, and a complete pes. Cladistic analysis shows that Archaeoceratopsis the sister group to all currently known Late Cretaceous Neoceratopsia, and Late Cretaceous Neoceratopsia diverged into two clades: the Asian Protoceratopsidae and the North American Ceratopsoidea, indicating a dual evolution for the two major groups of horned dinosaurs in two landmasses of Late Cretaceous. A suite of derived features characterizes Ceratopsoidea, such as a round−shaped external naris, a long caudolateral process of the rostral bone, and ventrally curved premaxillary ventral edge.
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New data on cranial anatomy of the ceratopsian dinosaur Psittacosaurus major
    Autorzy:
    You, H -L
    Tanoue, K.
    Dodson, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/20202.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    dinosaur
    Yixian Formation
    Cretaceous
    Dinosauria
    paleontology
    China
    Ceratopsia
    Psittacosaurus major
    ceratopsian dinosaur
    Liaoning
    anatomy
    Opis:
    An exceptionally preserved skull and mandible of ceratopsian dinosaur Psittacosaurus major revealed many anatomical details such as the existence of an elliptical median interpremaxillary foramen, a prominent neurovascular canal on the internal wall of the beak, long, slightly divergent basipterygoid processes developed as vertical blades with a deep cleft between them, and horizontally oriented vomer. The new specimen shows two autapomorphies of Psittacosaurus major, the transversely narrow dorsal skull roof and very prominent dentary flanges, confirming the presence of two large−skulled psittacosaur species in the Lujiatun Bed of the Lower Cretaceous Yixian Formation in Beipiao City, western Liaoning Province, China, the longand narrow−skulled P. major, and broad−skulled P. lujiatunensis.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new basal eusauropod from the Middle Jurassic of Yunnan, China, and faunal compositions and transitions of Asian sauropodomorph dinosaurs
    Autorzy:
    Xing, L.
    Miyashita, T.
    Currie, P.J.
    You, H.
    Zhang, J.
    Dong, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/945600.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Dinosauria
    Sauropoda
    Eusauropoda
    Jurassic
    eusauropod
    paleontology
    Middle Jurassic
    Yunnan province
    China
    fauna composition
    transition
    Asia
    sauropodomorph dinosaur
    dinosaur
    Opis:
    Many sauropod ghost lineages cross the Middle Jurassic, indicating a time interval that requires increased sampling. A wide taxonomic spectrum of sauropodomorphs is known from the Middle Jurassic of China, but the braincase of a new sauropod, named here Nebulasaurus taito gen. et sp. nov., is distinct. Nebulasaurus is sister taxon to Spinophorosaurus from the Middle Jurassic of Africa and represents a clade of basal eusauropods previously unknown from Asia. The revised faunal list indicates dramatic transitions in sauropodomorph faunas from the Jurassic to Cretaceous of Asia; these are consistent with geographic isolation of Asia through the Late Jurassic. Non-sauropod sauropodomorphs, non-mamenchisaurid eusauropods (including basal macronarians), and mamenchisaurids successively replaced previous grades through the Jurassic, and titanosauriforms excluded all other sauropod lineages across the Jurassic–Cretaceous boundary.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 1; 145-154
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A second Cretaceous ornithuromorph bird from the Changma Basin, Gansu Province, northwestern China
    Autorzy:
    You, H.-L.
    Atterholt, J.
    O'Connor, J.K.
    Harris, J.D.
    Lamanna, M.C.
    Li, D.-Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/22506.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    ornithuromorph bird
    bird
    Aves
    Ornithuromorpha
    Aptian
    Early Cretaceous
    paleontology
    Changma basin
    Gansu province
    China
    Opis:
    Finely−bedded lacustrine deposits of the Aptian (Lower Cretaceous) Xiagou Formation exposed in the Changma Basin of Gansu Province, northwestern China, have yielded numerous fossil vertebrate remains, including approximately 100 avian specimens. Though the majority of these birds appear referable to the ornithuromorph Gansus yumenensis, a number of enantiornithine fossils have also been recovered. Here we report on a specimen consisting of a complete, three−dimensionally preserved sternum, furcula, and sternal ribs that represents a second ornithuromorph taxon from the Xiagou Formation at Changma. The fossil exhibits morphologies that distinguish it from all previously−known Xiagou birds and demonstrate that it represents a derived non−ornithurine member of Ornithuromorpha. Though it is morphologically distinct from the equivalent elements of all other described ornithuromorphs, the material is too incomplete to justify the erection of a new taxon. Nonetheless, it increases the taxonomic diversity of the Xiagou avifauna, thereby expanding our knowledge of Early Cretaceous avian diversity and evolution.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A partial skeleton of an enantiornithine bird from the Early Cretaceous of Northwestern China
    Autorzy:
    Lamanna, M.C.
    You, H.-L.
    Harris, J.D.
    Chiappe, L.M.
    Ji, S.-A.
    Lu, J.-C.
    Ji, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/20670.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    China
    Cretaceous
    Early Cretaceous
    paleontology
    skeleton
    partial skeleton
    bird
    Aves
    enantiornithine bird
    Enantiornithes
    Xiagou Formation
    remains
    Opis:
    Although recent discoveries from Lower Cretaceous sediments in northeastern China have greatly improved our understanding of the initial stages of avian diversification in eastern Asia, the early evolution of Aves elsewhere on the continent remains poorly understood. In 2004, a collaborative field effort directed by personnel from the Chinese Academy of Geological Sciences and Carnegie Museum of Natural History recovered multiple partial to nearly complete avian skeletons from outcrops of the Lower Cretaceous Xiagou Formation exposed in the Changma Basin of northwestern Gansu Province, China. Here we describe a thrush−sized partial skeleton comprised of a fragmentary pelvic girdle and largely complete hind limbs. A phylogenetic analysis of 20 avian ingroup taxa and 169 anatomical characters places the specimen in Enantiornithes, and within that clade, in Euenantiornithes. When coupled with additional recent discoveries from the Changma Basin, the new skeleton improves our understanding of early avian evolution and diversification in central Asia.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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