Mammalia vs mammalian

Mammalia and mammalian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mammalia	Yes	No	No	No
mammalian	Yes	Yes	No	No

Mammalia (noun)	mammalian (noun)
warm-blooded vertebrates characterized by mammary glands in the female	any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk

Mammalia (adjective)	mammalian (adjective)
	of or relating to the class Mammalia