Meniscotherium tapiacitum (Cope 1874; Williamson and Lucas 1992; Middle Eocene 54-38 mya; 25-50 cm long) nests with Astrapotherium (below) in their own clade between Barylambda and Mesonyx. Considering the Paleocene date for Astrapotherium, Meniscotherium probably originated in the Cretaceous.
The incisor canines were just developing here on this otherwise generalized condyarth. |