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Anoigmaichnus : ウィキペディア英語版 | Anoigmaichnus
''Anoigmaichnus'' is an ichnogenus of bioclaustrations (a type of trace fossil). ''Anoigmaichnus'' includes shafts perpendicular to host's growth surface or tilted (up to 45°); conical to cylindrical; circular to oval cross-sections; lacking separate wall. Their apertures are elevated above host's growth surface forming a short chimney-like structures. ''Anoigmaichnus'' is the worlds earliest known macroscopic endobiotic symbiont and it may have been a parasite. It occurs in the Middle Ordovician bryozoans of Osmussaar Island, Estonia. ==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「Anoigmaichnus」の詳細全文を読む
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