Acratocnus

Acratocnus is an extinct genus of ground sloth found in Cuba, Hispaniola and Puerto Rico.

Classification
Like all of the Antillean sloths, Acratocnus is a member of the family Megalonychidae, whose sole surviving genus is Choloepus, representing the two-toed tree sloths.

Location
The species of Acratocnus were found on the islands of Puerto Rico, Cuba and Hispaniola, where they inhabited the montane forests of the highlands. The Puerto Rican ground sloth, Acratocnus odontrigonus is known from several poorly documented cave excavations in northwestern Puerto Rico. The various species are regarded as being semi-arboreal because of their (relatively speaking) small size and their large hooked claws.