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Minicrania
''Minicrania'' ("small skull") is an extinct genus of tiny antiarch fish, with armor averaging up to about long, which lived during the Lochkovian epoch in Early Devonian Yunnan Province, China and northern Vietnam.
Anatomically, ''Minicrania'' bears a strong resemblance to the Yunnanolepiformids (i.e., ''Yunnanolepis'' and ''Chuchinolepis''). However, other anatomical features, especially the head-width ratios, separate it from the Yunnanolepiformids. Zhu and Janvier regard it as the sister taxon of the sinolepids and the Euantiarchi (i.e., the bothriolepids and the asterolepids), representing a transitional form between the Euantiarchi and the more primitive Yunnanolepiformids.
There are two recognized species. The type species, ''M. lirouyii'', is found in Lochkovian-aged strata in Qujing, Yunnan, and is characterized by the presence of numerous tubercles covering the dermal surface of the armor. The specific name honors a Mr. Li Rou-yi, who assisted in collecting the first specimens. The second species, ''M. lissa'',〔 is found in Lochkovian deposits in northern Vietnam, near the Chinese border. ''M. lissas tubercles are comparatively very small and ill-defined, if present, hence the specific epithet "lissa" meaning "smooth." Otherwise, the armor is very similar, if not identical to that of ''M. lirouyi.''
==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「Minicrania」の詳細全文を読む
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