Procavia capensis (Pallas 1756, 50cm) is the living rock hyrax and a traditonal relative of Elephas and Dusisiren. Superficially it resembled a guinea pig. Closest relatives in the LRT include the African Phosphatherium and South American notoungulates like Hegetotherium. The hyrax inhabits rock crevices and lives in groups of 10-80 with some acting as sentries to sound the alarm at the sight of predators. They use at least 21 vocal signals. Note the tusk-like incisors with deep roots. The soles of the feet are heavily padded. The testes are held within the abdomen. It rests most of the time, often basking in the equatorial sun.

Hegetotherium mirabile (Ameghino 1887; Mid Miocene, 17mya; skull length 10cm) was originally considered a notoungulate. Here it nests as a sister to Procavia, the extant rock hyrax within the Notoungulata. Tiny third incisors, canines and first premolars distinguish this genus, completing the dental arcade. Procavia lacks those teeth.