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Hazhenia
''Hazhenia'' is an extinct genus of therocephalian therapsid from the Early Triassic of China, of which ''Hazhenia concava'' is the only species. ''Hazhenia'' was named in 1981 from the Heshanggou Formation in the Ordos Desert of Inner Mongolia. It lived during the Olenekian Age of the Early Triassic, about 247 million years ago. ''Hazhenia'' belongs to a group of therocephalians called Baurioidea and possesses many mammal-like features such as cusped teeth and a secondary palate, both of which evolved independently in baurioids. Within Baurioidea it is most closely related to the genus ''Ordosiodon'', which is also known from Inner Mongolia but comes from the slightly younger Ermaying Formation. Both genera were once placed in the family Ordosiidae, but as the name is preoccupied by a family of Cambrian trilobites, it is no longer valid.
''Hazhenia'' is known from a single skull that was discovered by a group from the Institute of Vertebrate Paleontology and Paleoanthropology in 1977, a year after the discovery of the first ''Ordosiodon'' remains. Both were initially classified as members of Scaloposauria, a group of small-sized therocephalians now regarded as a paraphyletic assemblage of basal baurioids. A phylogenetic analysis of therocephalians published in 2014 found ''Hazhenia'' and ''Ordosiodon'' to be each other's closest relatives, and placed both in a derived position within Baurioidea, close to the family Bauriidae. Below is a cladogram from that analysis:
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==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Hazhenia」の詳細全文を読む
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