Australosphenida

The Australosphenida are a clade of mammals, containing mammals with tribosphenic molars, known from the Jurassic to Mid-Cretaceous of Gondwana. In tribosphenic teeth, the lower molar is divided into two regions: the three-cusped trigonid, or shearing end, and the talonid, or crushing heel. 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 co

Ausktribosphenidae is an extinct family of australosphenidan mammals from the Early Cretaceous of Australia and mid Cretaceous of South America.

Ausktribosphenos is an extinct genus of mammals from the Early Cretaceous of Australia, sometime between 121 - 113 Ma during the Aptian. The only recorded species, Ausktribosphenos nyktos, was found on Flat Rocks in the Wonthaggi Formation, Victoria.

Henosferidae (also spelled "Henospheridae") is an extinct family of Australosphenida, native to Gondwana during the Early-Middle Jurassic. It is defined as a clade including the most recent common ancestor of Henosferus and Asfaltomylos and all its descendants.