Synonyms for Subclass Dibranchia (same or very similar meaning)
WordNet sense 1 (comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)):
Dibranchia, Dibranchiata, subclass Dibranchiata
From the ODE community, based on WordNet
add/edit