subclass Dibranchiata vs Dibranchia

subclass Dibranchiata and Dibranchia both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Dibranchiata	Yes	No	No	No
Dibranchia	Yes	No	No	No

As nouns, subclass Dibranchiata and Dibranchia are synonyms defined as:

subclass Dibranchiata and Dibranchia: comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)

Other synonyms of subclass Dibranchiata include Dibranchiata, subclass Dibranchia.

subclass Dibranchiata (noun)	Dibranchia (noun)
comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)	comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)