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Synaptidae is a family of sea cucumber that have no tube feet, tentacle ampullae, retractor muscles, respiratory trees, or cuvierian organs. They also lack radial canals of the water-vascular system, with only the circumoral ring present.〔Lambert, P. 1997. ''Sea cucumbers of British Columbia, southeast Alaska and Puget Sound.'' Univ. of British Columbia Press, Vancouver.〕 Synaptids have elongated bodies, and their size varies significantly from small to quite large. ''Synapta maculata'' grows to two metres in length. They are quite active, moving by means of waves of peristaltic contractions. Their tegument is somewhat sticky because of the anchor-like spicules that project through the skin.〔(Marine Species Identification Portal )〕 ==Genera== According to World Register of Marine Species:〔 * genus ''Anapta'' Semper, 1867 -- 5 species * genus ''Dactylapta'' Clark, 1908 -- 1 species * genus ''Epitomapta'' Heding, 1928 -- 2 species * genus ''Euapta'' Östergren, 1898 -- 5 species * genus ''Eupatinapta'' Heding, 1928 -- 2 species * genus ''Labidoplax'' Östergren, 1898 -- 6 species * genus ''Leptosynapta'' Verrill, 1867 -- 34 species * genus ''Oestergrenia'' Heding, 1931 -- 9 species * genus ''Opheodesoma'' Fisher, 1907 -- 10 species * genus ''Patinapta'' Heding, 1928 -- 6 species * genus ''Polyplectana'' Clark, 1908 -- 13 species * genus ''Protankyra'' Östergren, 1898 -- 36 species * genus ''Rhabdomolgus'' Keferstein, 1862 -- 1 species * genus ''Rynkatorpa'' Rowe & Pawson, 1967 -- 13 species * genus ''Synapta'' Eschscholtz, 1829 -- 2 species * genus ''Synaptula'' Örstedt, 1849 -- 29 species Image:Euapta godeffroi.jpg|''Euapta godeffroyi'' Image:Euapta lappa.jpg|''Euapta lappa'' Image:Opheodesoma grisea.jpg|''Opheodesoma grisea'' Image:Polyplectana kefersteinii.jpg|''Polyplectana kefersteinii'' Image:Synapta maculata 2.jpg|''Synapta maculata'' Image:Synaptula lamperti (Sea cucumber).jpg|''Synaptula lamperti'' 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「Synaptidae」の詳細全文を読む スポンサード リンク
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