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.
Pages in category "Tribosphenida"
The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes.