Mammaliaformes
A taxonomic clade in paleontology that includes mammals and their closest extinct relatives. Used in scientific contexts.
Mammaliaformes is a taxonomic group that includes mammals and their ancestors.
哺乳類 (mammals) is a subset of 哺乳形類 (Mammaliaformes); 哺乳形類 includes earlier stem-mammal forms.
A modern scientific compound of 哺乳 (breastfeeding) + 形 (form) + 類 (group), calqued from the taxonomic name Mammaliaformes.