Physical Characteristics

A transparent skin (corneal membrane) covers eye lens. Funnel-locking apparatus is a simple, straight groove and ridge. Fins attach to lateral regions of mantle. Arms have suckers in two series. Tentacular club with suckers in four series. Hooks are never present. Buccal connectives attach to ventral margins of ventral arms. Seven buccal lappets possess small suckers. Mantle is long, moderately slender, cylindrical, with a bluntly pointed posterior end; the fins are rhomboid with nearly straight sides. The gladius is long, rather wide, and feather-shaped; the ratio of greatest width of the vane of the gladius to greatest width of the rhachis (the central spine of the gladius) is 2.7-3.7 in females, 2.4-2.9 in males. The edge of the vane is curved (sometimes straight in males), thin, and rarely ribbed. Eyes are not unusually large; the diameter of the externally visible eyeball is 8-18% ML, and the diameter of dissected lens is 2-6% ML. The left ventral arm of mature males is hectocotyl-ized by modification of the outermost third to fourth of arm, but the modification does not extend to arm tip. Fewer than 12 of the suckers in dorsal row usually smaller than half the size of their counterparts in the ventral row; the bases or pedicels of some of the modified suckers are rounded and narrowly triangular.

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