branchiopodous vs branchiopodan

branchiopodous is not a noun while branchiopodan is a noun.

Word	Noun	Adjective	Verb	Adverb
branchiopodous	No	Yes	No	No
branchiopodan	Yes	Yes	No	No

As adjectives, branchiopodous and branchiopodan are synonyms defined as:

branchiopodous and branchiopodan: of or relating to or characteristic of the subclass Branchiopoda

Other synonyms of branchiopodous include branchiopod.

branchiopodous (noun)	branchiopodan (noun)
	aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding

branchiopodous (adjective)	branchiopodan (adjective)
of or relating to or characteristic of the subclass Branchiopoda	of or relating to or characteristic of the subclass Branchiopoda