- Mantle long, moderately slender, cylindrical.
- Fins rhomboidal, their length three quarters that of mantle, their posterior borders slightly concave.
- Largest arm sucker rings with 7 or 8 teeth.
- Left ventral arm hectocotylized in its distal third by modification of suckers into long papillae which gradually decrease in size distally.
- Suckers on manus of tentacular club subequal in size; sucker rings with 13 to 18 sharp, conical teeth.
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