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Xiangshuiosteus
''Xiangshuiosteus wui'' is a brachythoracid arthrodire placoderm from the Late Emsian epoch of Wuding, Yunnan. It has recently been reassessed as a dunkleosteid.〔
==Specimen and Taxonomy==
''X. wui'' is known from a flattened, "Buddhist cap" shaped skull roof. The skull roof is strongly reminiscent of those of coccosteids, but also has anatomical features otherwise diagnostic of buchanosteids. This mix of anatomy lead its describer, Wang Junqing, to suggest that ''X. wui'' is the sister taxon of Coccosteidae, and represents a transitional form between Coccosteidae and Buchanosteidae. A reappraisal of ''Kiangyousteus'' and several other eubrachythoracid arthrodire genera by You-An Zhu and Min Zhu lead to the conclusion that ''X. wui'' not only does not represent a transitional form between coccosteids and buchanosteids, but is actually a dunkleosteid closely related to the Gogo Reef ''Eastmanosteus calliaspis'' (which is, in turn, implied to be not of the genus ''Eastmanosteus'').〔Zhu, You‐An, and Min Zhu. "A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci." Zoological Journal of the Linnean Society169.4 (2013): 798-819.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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