subclass Dibranchiata vs subclass Dibranchia

subclass Dibranchiata and subclass Dibranchia both are nouns.

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

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

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

Other synonyms of subclass Dibranchiata include Dibranchia, Dibranchiata.

subclass Dibranchiata (noun)	subclass 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)