Browsing by Author "Liu, Jun, 1974-"
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Item A juvenile specimen of Anshunsaurus (Reptilia, Thalattosauria) ; American Museum novitates, no. 3582(New York, NY : American Museum of Natural History, 2007) Liu, Jun, 1974-A marine reptile from the Ladinian deposits near Xingyi is described and identified as a juvenile of Anshunsaurus wushaensis on the basis of similar skull proportions and many postcranial characters. Based on this specimen and observations of the holotype of A. wushaensis, there is no distinct ontogenetic differentiation in the length of the jugal. The absence of an astragalus in the holotype, and the greater length of metacarpal V relative to metacarpal IV, could be due to intraspecific variation. Ossification is not synchronous for corresponding elements on both sides of the body.Item Osteology of Andescynodon (Cynodontia, Traversodontidae) from the Middle Triassic of Argentina. (American Museum novitates, no. 3674)(New York, NY : American Museum of Natural History., 2009) Liu, Jun, 1974-; Powell, Jaime Eduardo.All available specimens of Andescynodon mendozensis and Rusconiodon mignonei are examined and restudied, and the latter species is regarded as a junior synonym of the former. The postcranial skeleton of this species is described for the first time; it generally shows primitive features of traversodontids. Andescynodon mendozensis is a small- to medium-sized traversodontid characterized by 9~11 upper postcanines in adults (fewer in larger individuals), the transverse ridge of upper postcanines lying anteriorly on the tooth, paracanine fossa penetrating the skull roof in adult; it is differentiated from Pascualgnathus by relatively flatten skull, shorter and narrower temporal region, presence of four rather than three upper incisors.Item Restudy of Anshunsaurus huangguoshuensis (Reptilia, Thalattosauria) from the Middle Triassic of Guizhou, China. American Museum novitates ; no. 3488(New York, NY : American Museum of Natural History, 2005) Liu, Jun, 1974-; Rieppel, OlivierWe here describe the complete skeletal anatomy of Anshunsaurus huangguoshuensis that previously remained unknown. The description includes a review of the dorsal side of the skull as well as the first description of the ventral side of the skull and of the postcranial skeleton. A new phylogenetic analysis supports the monophyly of Askeptosauridea and Thalattosauridea; Endennasaurus is found to be closely related to Askeptosauridae.