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Zhongxiniscus
''Zhongxiniscus'' is a genus of primitive chordate from eastern Yunnan that lived during the Early Cambrian. Known from a single specimen, it had a small, broad and short, fish-like body that was roughly ten millimeters in length. It possessed S-shaped myomeres, numbering roughly seven per one millimeter of length. Two triangular fins are evident on the dorsal margin.
==Evolutionary relationships==
When compared to other Cambrian chordates like the possible cephalochordate ''Cathaymyrus'' and the two known vertebrates ''Haikouicthys'' and ''Myllokunmingia'', ''Zhongxiniscus'' resembles ''Cathaymyrus'' in having S-shaped myomeres, but is different in having a dorsal fin and a shorter body. ''Zhongxiniscus'' approaches in form to ''Haikouicthys'' and ''Myllokunmingia'' in its myomeres and its dorsal fin, but differs from the latter two having zigzag myomeres and fin rays, which ''Zhongxiniscus'' evidently lacks.
For these reasons, ''Zhongxiniscus'' is tentatively considered to be an intermediate form between ''Cathaymyrus'' and the two vertebrates ''Haikouichthys'' and ''Myllokunmingia''.
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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