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''Vitreledonella richardi'', also known as the glass octopus, is an incirrate octopus. It is the sole representative of the genus ''Vitreledonella'' and of the family Vitreledonellidae. ''Vitreledonella'' is a transparent, gelatinous, and almost colorless meso- to bathypelagic octopod found worldwide in tropical and subtropical seas with a mantle length (ML) of up to 11 cm and a total length of up to 45 cm in adults. The upper three pairs of arms are subequal in length; in juveniles about as long as the mantle, in adults 2–3 times ML. The fourth, ventral pair is slightly shorter. Suckers are small, widely separated, and in a single series. In males, the left arm III is hectocotylized, with a spherical vesicle near the tip, but is not detachable. Eyes are nearly rectangular in shape as seen from the side. The radula is heterodont, also known as heteroglossan, in which the middle or rhachidian tooth is each array has multiple cusps and the lateral teeth are unicuspid. ''Vitreledonella'' is ovoviviparous. The female broods her eggs, of which there are hundreds, within the mantle cavity. Each egg measures about 4 mm in length. Newborn larvae have a ML of approximately 2.2 mm. ''Amphitretus'' and ''Bolitaena'' are two other transparent, gelatinous pelagic incirrate octopods. Both of these genera differ from ''Vitreledonella'' in that the right third arm is hectocotylized and the radula is ctenodont (with comb-like individual teeth). ==External links== * (Tree of Life web project: ''Vitreledonella'' ) * ( ''Vitreledonella richardi'' - Marine species identification ) 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「Vitreledonella」の詳細全文を読む スポンサード リンク
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