bivalved vs bivalve

bivalved is not a noun while bivalve is a noun.

Word	Noun	Adjective	Verb	Adverb
bivalved	No	Yes	No	No
bivalve	Yes	Yes	No	No

As adjectives, bivalved and bivalve are synonyms defined as:

bivalved and bivalve: used of mollusks having two shells (as clams etc.)

bivalved (noun)	bivalve (noun)
	marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together

bivalved (adjective)	bivalve (adjective)
used of mollusks having two shells (as clams etc.)	used of mollusks having two shells (as clams etc.)