Didolodus is an extinct genus of mammal. It is currently classified as a condylarth, having been previously associated with arctocyonians

Arctocyonidae

Arctocyonidae is an extinct family of unspecialized, primitive mammals with more than 20 genera most abundant during the Paleocene, but extant from the late Cretaceous to the early Eocene ....

 and litopterns

Litopterna

Litopterna is an extinct order of fossil hoofed mammals from the Tertiary period that displays toe reduction. Three-toed, and even a one-toed horselike form developed....

. Its remains were found in Patagonia.

Didolodus was a quick-footed creature which probably lived like early ungulate

Ungulate

Ungulates are several groups of mammals, most of which use the tips of their toes, usually hoofed, to sustain their whole body weight while moving. They make up several orders of mammals, of which six to eight survive...

s such as Propalaeotherium

Propalaeotherium

Propalaeotherium was an early genus of perissodactyl ancestral to the horse endemic to Europe and Asia during the Middle Eocene.Its name means "before Palaeotherium", as it is the ancestor of Palaeotherium, another relative of early horses...

, based on its highly similar teeth. It was around 60 centimetres (2 ft) in length, with short limbs and a long tail.