Description
provided by World Register of Marine Species
The family is characterized by a funnel locking-cartilage with a long, narrow longitudinal groove and a short, broad transverse groove (-l -shaped); long broad fins in the shape of a rhombus that extend nearly the full length of the mantle; a nuchal-mantle lock with two distinct knobs that fit into opposing pits; extremely long, cirrate trabeculae on the arms; buccal connectives that attach to the ventral borders of arms IV; two rows of suckers on the arms and four rows of suckers on the manus; the absence of photophores.
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