| Clade (node-based) | | Mammaliaformes Rowe, 1988 | | [T. Rowe, 1988: 250] |
| Clade (node-based) | | Mammaliamorpha Rowe, 1988 | | [T. Rowe, 1988: 249] |
| Defined by the most recent common ancestor (and all its descendants) of | | Monotremata | | [T. Rowe, 1988: 247] |
| Defined by the most recent common ancestor (and all its descendants) of | | Theria | | [T. Rowe, 1988: 247] |