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''Davidaster'' is a genus of crinoids. According to the World Register of Marine Species, a number of species that originally were included in the genus ''Nemaster'' are now included in ''Davidaster''.〔 Members of this genus have wedge-shaped arms, except for the basal ones, often longer than they are wide. The mouth is off centre and there are no pinnule combs after pinnule 3. The primary comb has the teeth widely separated and confluent with the lateral edge of the segment.〔 ==Species== *Species ''Davidaster discoideus'' (Carpenter, 1888) :synonyms ''Nemaster discoidea'' (Carpenter, 1888) ::::''Nemaster insolitus'' AH Clark, 1917 *Species ''Davidaster rubiginosus'' (Pourtalès, 1869) :synonyms ''Nemaster iowensis'' Springer, 1902 ::::''Nemaster lineata'' (Carpenter, 1880) ::::''Nemaster mexicanensis'' Tommasi, 1966 ::::''Nemaster rubiginosa'' (Pourtalès, 1869) 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「Davidaster」の詳細全文を読む スポンサード リンク
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