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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gryphaeidae ： ウィキペディア英語版 Gryphaeidae The Gryphaeidae, common name the foam oysters or honeycomb oysters, are a family of marine bivalve mollusks, and are a kind of true oyster. This family of bivalves is very well represented in the fossil record, however the number of living species is very few. All species have shells cemented to a substrate. Shells are considered brittle, inequivalve, with the left, lower (cemented) valve convex and the right (upper, non-cemented) valve flat or slightly concave. ==Subfamilies== Genera and species within this family are divided into three subfamilies, Exogyrinae, Gryphaeinae and Pycnodonteinae. Both Exogyrinae and Gryphaeinae are completely extinct. Only four genera ''Hyotissa'', ''Parahyotissa'', ''Pycnodonte'' and ''Neopycnodonte'' in the subfamily Pycnodonteinae have extant species.〔(The Paleobiology Database Gryphaeidae entry ) accessed on 6 February, 2011〕 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「Gryphaeidae」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.