Descriptions of Eucleoteuthis luminosa (Sasaki, 1915) and Ornithoteuthis volatilis (Sasaki, 1915) Paralarvae in the Northwestern Pacific

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  • 北西太平洋で採集されたスジイカおよびヤセトビイカ稚仔の形態について

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Description

Eucleoteuthis luminosa paralarvae ranging from 1.4 to 12.4 mm in mantle length (ML) and Ornithoteuthis volatilis paralarvae ranging from 2.4 to 5.4 mm ML are described based on specimens collected from waters off the Ogasawara Islands and from off Shikoku to the Philippine Sea. E. luminosa paralarvae are characterized by having subocular and intestinal photophores, a relatively long proboscis with a mean proboscis index (ratio of proboscis length to mantle length) of 0.70, and moderately enlarged lateral proboscis suckers with a mean ratio of lateral sucker diameter to medial sucker diameter ratio of 1.57. O. volatilis paralarvae are characterized by having subocular and intestinal photophores, a relatively short proboscis with a mean proboscis index of 0.49, and considerably enlarged lateral proboscis suckers, with a mean ratio of lateral sucker diameter to medial sucker diameter of 2.09.

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