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Histioteuthis reversa
''Histioteuthis reversa'', commonly known as the reverse jewel squid or the elongate jewel squid, is a species of cock-eyed squid, so called because the eyes are dissimilar. It occurs at moderate depths in the Atlantic Ocean and Mediterranean Sea and is also known from the Indian Ocean.
==Description==
''Histioteuthis reversa'' grows to a mantle length of about . The head bears four pairs of robust arms, a pair of tentacles and two unequal-sized eyes and the main body mass is enclosed in the mantle. The arms are less than one and a half times the length of the mantle. The outer arms are not joined to each other by a web and the inner arms are connected by a vestigial web remnant. The suckers on the arms are globular, usually with teeth on the margin, and the suckers on the terminal portion of the tentacles are in five or six rows, with larger suckers in the central rows. The mantle is cup-shaped and elongates considerably in females when they mature. The fins are a third to a half the length of the mantle and roughly half its width. The ventral (under) surface of the mantle has a complex arrangement of large and small compound light-emitting photophores, and seventeen large and one small photophore surround the right eye. In front of the left eye there are seven large photophores and the eye is ringed by ten to fourteen small ones.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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