Lophiodon and Agriochoerus latifrons

Agriochoerus latifrons (Leidy 1850, 1869; Wortman 1895, O'Harra 1920, Late Eocene to Oligocene, 38–16mya, skeleton) has a distinctly different tooth pattern with large lateral incisors and a diastema. In the LRT, this taxon is the basalmost artiodactyl and shares an ancestry with Nasua, the extant coatimundi.

Agriochoerus latifrons and Lophiodon skulls

Lophiodon ballardi (Cuvier 1822, Holbrook 2009, originally Tapirotherium Blainville 1817, Eocene) is traditionally considered a chalicothere or a tapir. Here it nests with Agriochoerus latifrons. Note the four fingers and three toes. The dentary tip rises. The skull length is equal to the neck length. The limbs are short and robust.

Cuvier G 1822. Recherches sur les Ossemens Fossiles (Nouvelle Edition)2(1): Chez G. Dufour et E. D’Ocagne, Paris, France.

Holbrook LT 2009. Osteology of Lophiodon Cuvier, 1822 (Mammalia Perissodactyla) and its phylogenetic implications. Journal of Vertebrate Paleontology 29(1):212–230.

Leidy J 1869. Extinct Mammals of Dakota and Nebraska:Including an account of some allied forms from other localities, together with a synopsis of the mammalian remains of North America., Journal of the Academy of Natural Sciences, Philadelphia 2(7): 135–141.

O'Harra CC 1920. The White River Badlands. South Dakota School of Mines. 13: 1–181 + plates.

Wortman JL 1895. On the osteology of Agriochoerus. Bulletin of the American Museum of Natural History 7(4):145–179.

wiki/Lophiodon
wiki/Agriochoerus

Mammalia

Ornithorhynchus and kin

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