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Matutidae is a family of crabs, sometimes called ''moon crabs'', adapted for swimming or digging. They differ from the swimming crabs of the family Portunidae in that all five pairs of legs are flattened, rather than just the last pair, as in Portunidae. Crabs in the Matutidae are aggressive predators. ==Taxonomy== Traditionally, this taxon contained the single genus ''Matuta'', and was considered a subfamily of the Calappidae.〔 Now, the group is ranked as a family and six genera (four extant and two fossil) are now recognised. Although placed in the Calappoidea, it is not clear that Matutidae and Calappidae are closely related. *''Ashtoret'' Galil & P. F. Clark, 1994 *† ''Eomatuta'' De Angeli & Marchiori, 2009 *''Izanami'' Galil & P. F. Clark, 1994 *''Matuta'' Weber, 1795 *''Mebeli'' Galil & P. F. Clark, 1994 *† ''Szaboa'' Müller & Galil, 1998 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「Matutidae」の詳細全文を読む スポンサード リンク
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