With the possible exception of Megazostrodon and Erythrotherium (as well as placental mammals), all mammaliforms possess epipubic bones, a possibly synapomorphy with tritylodontids, which also have them.
Except for Megazostrodon and Erythrotherium (as well as placental mammals), all mammaliforms possess epipubic bones. This feature is possibly a shared characteristic with tritylodontids, which also have them.