Only a single species is known in this family. The most distinctive features of these squid are very large terminal fins, short tentacles with numerous sucker series and arms and tentacles with slender, elongate tips that are vermiform in appearance. Fins Length equal to or greater than squid length from posterior tip of muscular mantle to tip of tentacles. Width approximates length. Without keels or locking apparatus.
Club suckers small, in approximately eight series except at base.
Sucker dentition unknown. Distal tips vermiform . Suckers biserial distally, in 3 to 4 series at base. Inner sucker rings probably smooth. Distal tips vermiform.