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Seisonidae is a family of rotifers, found on the gills of ''Nebalia'', a marine crustacean. Peculiar among rotifers, males and females are both present and equal in size. It is considered to have diverged from the other rotifers early on, and in one treatment is placed in a separate class Seisonoidea.〔, p. 98〕 They have a large and elongate body with reduced corona. == Species == Two genera with total three species belong to Seisonidae:〔 * ''Paraseison'' Plate, 1887 * * ''Paraseison annulatus'' (Claus, 1876) — ectoparasite of ''Nebalia''〔 * ''Seison'' Grube, 1861 * * ''Seison nebaliae'' Grube, 1861 – commensal of ''Nebalia''〔 * * ''Seison africanus'' Sorensen, Segers & Funch, 2005 — host is unknown.〔 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「Seisonidae」の詳細全文を読む スポンサード リンク
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