Histioteuthis reversa
species of mollusc
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 the Mediterranean Sea. It is also known from the Indian Ocean.
Description
Histioteuthis reversa grows to a mantle length of about 19 cm (7.5 in). 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.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Oct 4, 2025. The linked authority identifier is Q2471939. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Histioteuthis reversa” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.