Cramaucheniinae
Cramaucheniinae is a paraphyletic or monophyletic subfamily of macraucheniids that originated in the middle Eocene. The size range of the group ranged from small, basal forms to larger and more derived forms. During their evolution, the cramaucheniines undergone a trend from evolving from small basal forms such as Polymorphis into larger, more derived taxa such as Theosodon.