Mammaliaformes

Usage notes

 * Ranks are sometimes assigned to well-studied lines of taxa, such as those leading to . As the assignment of 'order' to Therapsida and 'class' to (placed under Therapsida) shows, they are no longer of much utility.
 * The clades themselves are periodically invented and reinvented, defined and redefined, circumscribed and recircumscribed, and sometimes abandoned.

Hypernyms

 * ; - subphylum; Gnathostomata - infraphylum;  - superclass;, , ,  - clades;  - informal group; Eupelycosauria - clade; Therapsida - order; ,  - clades

Hyponyms

 * - class; †, † - order; † - family