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Gigantostrea : ウィキペディア英語版 | Gigantostrea
''Gigantostrea'' is an extinct genus of marine bivalve mollusks belonging to the family Gryphaeidae. 〔(Encycopedia of life ) 〕 This genus is known in the fossil record from the Eocene to the Miocene (age range: from 48.6 to 15.97 million years ago). 〔 These fossils have been found in Europe and United States.〔〔(GBIF ) 〕 ==Description== Shells of ''Gigantostrea'' can reach a size of about .〔(International Fossil Shells Museum ) 〕 These fossil shells are brittle, inequivalve, with the lower valve convex and the upper valve flat or slightly concave. The lower valve was cemented to the substrate.
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「Gigantostrea」の詳細全文を読む
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