Where does “ευμετάζωα” come from?

ευμετάζωα (Greek) comes from Translingual Eumetazoa, from Translingual eu-, from Ancient Greek εὖ, from Ancient Greek ἐΰς, from Proto-Hellenic ehu-, from Proto-Indo-European h₁su-, from Proto-Indo-European h₁wes- — good; to be cheerful, happy; to eat, to feast.

ευμετάζωα (Greek): The Eumetazoa