Procavia capensis (Pallas 1756, 50cm) is the living rock hyrax and a living relative of Elephas and Dusisiren. Superficially it resembled a guinea pig. It 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. Distinct from its relatives, Procavia is thickly furred. 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.

Grangeria gobiensis (Colbert 1934) is known from crushed materials of several individuals of various sizes. The incisors are large, as in Procavia. The manus and pes are transitional to derived chalicotheres. The generic name is shared with a plant.

Litolophus gobiensis (Radinsky 1964b, Bai, Wang and Meng 2010, 2011; Early Eocene) is traditionally considered a basal chalicothere with a slender premaxilla that curves ventrally and a tall parietal. In the LRT this taxon is transitional from chalicotheres to the rest of the perissodactyls. The hooves were small and round, not large and sharp.

Lophiaspis maurettei(Depéret 1910; Vautrin et al. 2014, Early Eocene 43mya; skull length 20+ cm) Originally Lophiaspis was considered a basal tapir and perissodactyl close to Lophiodon. Here Lophiaspis nests with Grangeria. The skull is flattened and wide. Premolars are absent. Incisors are reduced.

Diadiaphorus majusculus (Ameghino 1887; Hatcher and Scott 1910; Miocene, 10mya; 1.2 m long) was a horse-mimic with only one hoof contacting the substrate. This South American perissodctyl was a sister to the living hyrax, Procavia from Africa.

Thoatherium minusculum (Ameghino 1887, Hatcher 1901, 70cm long) is primitive for Liptoterna in the LRT, despite the highly derived single finger and toe. That means there is a more primitive three-toed version of Thaotherium waiting to be described. Dorcatherium is the outgroup taxon. Too few fingers and toe parts were preserved to count the digits.