Aegialodontia

Aegialodontia is a clade of extinct early mammals, close to the origin of Boreosphenida. The clade includes some of the oldest known tribosphenic taxa, until the discovery of "Tribactonodon" from the Berriasian Durlston Formation in 2001, "Aegialodon" from the Valanginian Wadhurst Clay Formation was the oldest taxon with the tooth form. The Aptian to Albian taxon "Kielantherium" from Mongolia, formerly a synonym of "Aegialodon", is also within the group, sister to "Aegialodon" within Aegialodontidae.