eumetazoa
A technical term in zoology referring to the subkingdom Eumetazoa, which includes all animals except sponges and a few other primitive groups. Used in academic and scientific contexts.
Eumetazoa is a taxonomic group that includes most animals except sponges.
後生動物 (Metazoa) is a broader term that includes all multicellular animals, while 真正後生動物 (Eumetazoa) is a subgroup excluding sponges and similar primitive forms.
A compound of 真正 (true, genuine) and 後生動物 (Metazoa), likely a calque from the scientific term Eumetazoa.