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}} ''Atrypa'' is a genus of brachiopod with shells round to short egg-shaped, covered with many fine radial ridges (or costae), that split further out and growthlines perpendicular to the costae and 2-3 times wider spaced. The pedunculate valve is a little convex, but tends to level out or even become slightly concave toward the anterior margin (that is: opposite hinge and pedicle). The brachial valve is highly convex. There is no interarea (that is a flat area bordering the hinge line approximately perpendicular with the rest of the valve) in either valve. ''Atrypa'' was a cosmopolitan and occurred from the late Lower Silurian (Telychian) to the early Upper Devonian (Frasnian). == Reassigned species == As ''Atrypa'' was erected early on, many species have been reassigned since.〔 File:Atrypa devoniana pedunculate Rockford IO CRF.jpg|''Atrypa devoniana'', pedical valve File:Atrypa devoniana brachial Rockford IO CRF.jpg|''Atrypa devoniana'', brachial valve File:Atrypa devoniana anterior Rockford IO CRF.jpg|''Atrypa devoniana'', anterior view File:Atrypa devoniana posterior Rockford IO CRF.jpg|''Atrypa devoniana'', posterior view File:Atrypa devoniana lateral Rochford IO CRF.jpg|''Atrypa devoniana'', lateral view 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「Atrypa」の詳細全文を読む スポンサード リンク
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