Theriiformes

Theriiformes is a clade of mammals. The term was coined by Timothy B. Rowe in his doctoral dissertation, and is defined as the clade formed by the most recent common ancestor of multituberculates (which form part of the broader group Allotheria, along with Gondwanatheria and likely all or part of Haramiyida) and Theria (the group containing marsupials and placental mammals). Mammals more closely related to therians than to multituberculates are included in the clade Trechnotheria.

Holotheria is a diverse group of mammals that are descendants of the last common ancestor of Kuehneotherium (now known to be a non-mammalian cynodont) and Theria (the group that includes marsupials and placental mammals). The group is characterized by the beginning of the triangulation of a typical triconodont dentition in morganucodonts, towards a symmetrodonta. This triangulation occurs convergently in Docodontiformes although Shuotheriidae was formerly considered sister to Australosphenida. There are studies that place Docodonta as sister to Monotremata, which would make Docodontiformes fal

Tinodontidae is an extinct family of actively mobile mammals, endemic to what would now be North America, Asia, Europe, and Africa during the Jurassic and Cretaceous periods.