| Tribosphenida Temporal range: Middle Jurassic-Recent |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Subclass: | Theriiformes |
| Infraclass: | Holotheria |
| (unranked): | sublegion Zatheria |
| (unranked): | Tribosphenida McKenna, 1975 |
| Clades | |
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Tribosphenida is a group (infralegion) of mammals that is defined as including the ancestor of Hypomylos, Necrolestidae, Aegialodontia and supercohort Theria (living Therians plus all of its descendants).
McKenna, Bell: Classification of Mammal: Above the Species Level
Teun van Rheede , Trijntje Bastiaans , David N Boone , S Blair Hedges , Wilfried W de Jong , Ole Madsen: The Platypus is in its Place: Nuclear Genes and Indels Confirm the Sister Group Relation of Monotremes and Therians.