Tribosphenida

Tribosphenida is a group (infralegion) of mammals that includes the ancestor of Hypomylos, Aegialodontia and Theria (the last common ancestor of marsupials and placentals plus all of its descendants). Its current definition is more or less synonymous with Boreosphenida.

References

Other websites
 MESOZOIC MAMMALS; Stem zatherians, zatherians & Peramuridae, an internet directory
 THERIA И MARSUPIONTA (in Russian)
 Infralegion Tribosphenida - Hierarchy - The Taxonomicon

Category:Taxonomy
Category:Mammals