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''Petroxestes'' is a shallow, elongate boring (a type of trace fossil) originally found excavated in carbonate skeletons and hardgrounds of the Upper Ordovician of North America (Wilson and Palmer, 1988, 2006). These Ordovician borings were likely made by the mytilacean bivalve ''Corallidomus'' as it ground a shallow groove in the substrate to maintain its feeding position (Pojeta and Palmer, 1976). They are thus the earliest known bivalve borings (Taylor and Wilson, 2003). ''Petroxestes'' was later described from the Lower Silurian of Anticosti Island (Canada) by Tapanila and Copper (2002) and the Miocene of the Caribbean by Pickerill et al. (2001). ==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「Petroxestes」の詳細全文を読む スポンサード リンク
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