Australosphenida

Australosphenida Temporal range: Middle Jurassic–Cenomanian PreꞒ Ꞓ O S D C P T J K Pg N
Jaw fragment of Ambondro mahabo
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Clade:	Australosphenida Luo, Cifelli, & Kielan-Jaworowska, 2001
Taxa
†Ausktribosphenidae †Bishopidae †Henosferidae ?Monotremata And see text

The Australosphenida are a clade of mammals, containing mammals with tribosphenic molars, known from the Jurassic to Mid-Cretaceous of Gondwana. Although they have often been suggested to have acquired tribosphenic molars independently from those of Tribosphenida, this has been disputed. Fossils of australosphenidans have been found from the Jurassic of Madagascar and Argentina, and Cretaceous of Australia and Argentina. Monotremes have also been considered a part of this group in its original definition and in many subsequent studies, but its relationship with the relationship with other members has been disputed by some scholars.