Eoletes gracilis (Biryukov 1974; Lucas SG, Emry RJ and Bayshashov BU 1997;KAN 5088/69; Middle Eocene, 45mya) nests as a basal machrauchenid in the LRT. The skull is quite narrow. The premolars are molarized. Lower premaxillary teeth were present. The frontals formed a postorbital bar as in Theosodon. The nares formed a single dorsal slit on the rostrum.

Theosodon garrettorum (Ameghino 1887; Hatcher 1910; early Miocene, 20mya; 2m in length) was a smaller, more primitive macrauchenid, sharing some traits with Tapirus and Heptodon. It had elongate naris and a very short and split nasal. A full arcade of teeth, and three toes per foot are traits shared with Macrauchenia.

Macrauchenia patachonica (Owen 1838; Pliocene, 7mya; 3m in length) was considered a member of the Liptoterna. Here it nests with the clade of tapirs and chalicotheres. It is preceded by Theosodon, Chalicotherium and Heptodon in the large reptile tree and represents the last in its lineage. It resembled a camel, but it had a trunk originating from the open naris on top of its skull. There were three splayed and hoofed toes on each foot. The jaws included a full set of 11 teeth (x4) without a diastema. The canine was incisor-like. The nasal may be missing.