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Abra is a genus of saltwater clams, marine bivalve mollusks in the family Semelidae. Members of this genus are mostly under 1.5 centimeters long, and have thin shells which are usually white. These bivalves normally live under the surface of sandy and muddy sediments, in the neritic zone.〔Barrett, J. & C. M. Yonge (1958) ''Collins Pocket Guide to the Sea Shore.'' Collins, London〕 They are considered an important food source for flat fish. 〔Rees, H.L. and Dare. P.J (1993)Sources of mortality and associated life-cycle traits of selected benthic species: a review. Fisheries Research Data Report No. 33, Directorate of Fisheries Research, Lowestoft.〕 ==Species== Species within the genus ''Abra'' include: *''Abra aequalis'' (Say, 1822) *''Abra alba'' (Wood W., 1802) *''Abra californica'' Kundsen, 1970 *''Abra lioica'' (Dall, 1881) *''Abra longicallis'' Sacchi, 1836 *''Abra nitida'' (O. F. Mueller, 1776) *''Abra pacifica'' Dall, 1915 *''Abra prismatica'' *''Abra profundorum'' E. A. Smith, 1885 *''Abra segmentum'' (Récluz, 1843) *''Abra tenuis'' (Montagu, 1818) *''Abra tepocana'' Dall, 1915 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「Abra (genus)」の詳細全文を読む スポンサード リンク
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