Desmopteridae Desmopteridae is a family of pelagic sea snails or "sea butterflies", marine gastropod mollusks in the superfamily Cymbulioidea .Desmopterus Chun , 1889 is the type genus of the family Desmopteridae.protandric hermaphrodites . There is no shell, no protoconch and no longer any supporting tissue . The body consists almost completely of the two big parapodia.Species Species within the genus Desmopterus include: Desmopterus cirropterus Gegenbaur, 1855 Desmopterus gardineri Tesch, 1910 - Distribution: Indian Ocean . Desmopterus pacificus Essenberg, 1919 - Distribution: California, Oceanic . Description: shorter wing plate tentacles . Desmopterus papilio Chun, 1889 Distribution: Seychelles, Florida, Bermuda, Venezuela , Brazil, Adriatic Sea , tropical and subtropical oceanic waters. Length: body length between 0.5 – 2.0 mm, swimming wings between 2.0- 4.0 mm. Description: There is no shell. The animal has wings that are disc-shaped and transparent . The body is large and situated centrally between the lateral wings. These can unite to form a plate with on each side long, ciliated tentacles trailing behind. Most of the time , Desmopterus papilio hangs motionless, but flaps away in a loop pattern when disturbed . There are reddish-brown spots at the margin of the wings.
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