Browsing by Author "Hu, Yaoming."
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Item Glires (Mammalia) from the late Paleocene Bayan Ulan locality of Inner Mongolia. American Museum novitates ; no. 3473(New York, NY : American Museum of Natural History, 2005) Meng, Jin (Paleontologist); Wyss, André R.; Hu, Yaoming.; Wang, Yuanqing.; Bowen, Gabriel J.; Koch, Paul L.Two new early diverging members of Glires, Eomylus bayanulanensis, n.sp. and Palaeomylus lii, n.gen. and n.sp., are described from the late Paleocene Bayan Ulan Fauna, Inner Mongolia, China. These species add significantly to the diversity of Glires known from the early Paleogene of Asia. E. bayanulanensis and Palaeomylus sp. come from the lowest level of the Bayan Ulan section, from which the classic Bayan Ulan Fauna was collected. Palaeomylus lii and specimens belonging to two other genera of mammals, Pseudictops and Palaeostylops, are found from a horizon about 8 m above strata yielding the Bayan Ulan Fauna. These taxa are tentatively regarded as constituting a distinct faunal assemblage, which may prove to be of biostratigraphic utility within the region. Two calcanea tentatively assigned to Gomphos from a stratigraphic horizon slightly above the bed producing P. lii suggest the presence of strata of early Eocene age in the Bayan Ulan section.Item A new spalacotheriid symmetrodont from the early Cretaceous of northeastern China. American Museum novitates ; no. 3475(New York, NY : American Museum of Natural History, 2005) Hu, Yaoming.; Fox, Richard C.; Wang, Yuanqing.; Li, Chuankui.Symmetrodonts are Mesozoic mammals having lower molars with nearly symmetrical trigonids but lacking talonids. They appear to be stem members of the mammalian clade that led to extant tribosphenic mammals, but the fossil record of symmetrodonts is poor. Here we report a new genus and species of an acute-angled spalacotheriid symmetrodont, Heishanlestes changi, n.gen. and n.sp., represented by well-preserved lower jaws with teeth from the early Cretaceous of northeastern China. The new mammal has four tightly spaced premolars and three morphological groups of lower molars, in which the first molar has an obtuse trigonid angle and the last two molars have a large neomorphic cusp in the center of the trigonid, a feature not seen in other mammals. Heishanlestes appears to be a specialized member of the spalacotheriid subfamily, Spalacolestinae, which is otherwise only known from North America. The animal probably used the premolars to crush its prey before shearing it with the molars.Item The osteology of Rhombomylus (Mammalia, Glires) : implications for phylogeny and evolution of Glires. Bulletin of the AMNH ; no. 275(New York, NY : American Museum of Natural History, 2003) Meng, Jin (Paleontologist); Hu, Yaoming.; Li, Chuan-Kuei.Rhombomylus is a gliroid mammal endemic to several early Eocene localities of central and eastern Asia. It is best represented by a collection of numerous jaws and teeth, dozens of juvenile and adult skulls, and associated postcranial specimens from the early Eocene Yuhuangding Formation at the Dajian village, Junxian County, Hubei Province, China ... The core of the study consists of a taxonomic revision of the genus, a detailed description of the osteological morphology, extensive analyses on morphological characters, analyses on phylogeny, discussions on divergence time of the Glires, and analyses on functional morphology of mastication and locomotion. In comparing all known specimens assigned to the genus, we recognize only a single species, Rhombomylus turpanensis, for the genus and consider "R. laianensis" a junior synonym...