what phylum is mammalia
Mammals. Mammals are a class in the chordate phylum. Mammals are like other chordates in that they have backbones. Mammals have several distinct characteristics. 1  They have hair on their bodies.2  They nurse their young.ammals. Mammals are a class in the chordate phylum. Mammals are like other chordates in that they have backbones. Mammals have several distinct characteristics. 1  They have hair on their bodies.