Could be the monotremes and therians, which diverged by the early Jurassic or marsupials and placentals which are the main mammalian groups today and diverged as distinct groups by the late Jurassic 🤷♂️
14
Anonymouspreservation_bias1w
Absolutely tragic
6
Anonymous#31w
While I don’t think they represent real mammal clades, the presence of external ear pinnae in both suggests they’re both theriimorphs. Maybe an allothere and therian? Idk