Docodonta

Docodonta is an order of extinct mammaliaforms that lived during the mid- to late-Mesozoic era. Their most distinguishing physical features were their relatively sophisticated molar teeth, from which the order gets its name. Until recently, Docodonta were represented primarily by isolated teeth and bits of jawbones, with most of these specimens found across former Laurasia (modern-day North America, Europe, and Asia), and some from Gondwana (modern-day India and Southern Hemisphere). However, recent discoveries in China have included some exceptionally well preserved almost complete body fossils

Docodonts are traditionally thought to have been primarily ground dwelling and insectivorous, but Castorocauda and Haldanodon were specialised for an aquatic lifestyle and had recurved molars, which suggests possible fish or aquatic invertebrate diet. It was thought likely that many docodonts had tendencies towards aquatic habits, given their presence in wetland environments. However, recent discoveries such as the specialised digging species Docofossor, and specialised tree-dweller Agilodocodon suggest Docodonta is more ecologically diverse than previously suspected. Docofossor shows many of the same physical traits as the modern day golden mole, such as wide, shortened digits in the hands for digging.