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Class Mammalia
Order Artiodactyla
Suborder Ruminantia
Family Antilocapridae

Regional Pleistocene distribution of Tetrameryx sp.

Tetrameryx sp.—Four-horned Pronghorn

Discussion. Tebedge (1988:206) assigned a juvenile posterior horn core to this genus based on the prominent groove on the posterior horn, the strong divergence of the horns antero-posteriorly, and the elliptical shape of the posterior horn in cross-section." I consider it most likely to represent Stockoceros and have not added it to the Dark Canyon faunal list.

Van Devender et al. (1985) listed Tetrameryx sp. from La Brisca, noting that the tooth was larger than those of Stockoceros, Antilocapra, and Capromeryx, but that the enamel pattern was similar to antilocaprids—and thus they assigned it to Tetrameryx.


Late Blancan: 111 Ranch (Morgan and White 2005: ?).

Late Blancan/Early Irvingtonian: Elsinore: Mimomys (Pajak et al. 1996: ?).

Irvingtonian: Elsinore: Microtus/Mammuthus (Pajak et al. 1996: ?).

Irvingtonian/Rancholabrean: Cadiz (Jefferson 2014).

Rancholabrean: Tule Springs 4 (Jefferson et al. 2015: ?); Tule Springs 5 (Jefferson et al. 2015); Tule Springs 6 (Jefferson et al. 2015).

Sangamon: La Brisca (Van Devender et al. 1985).

Literature. Jefferson 2014; Jefferson et al. 2015; Morgan and White 2005; Pajak et al. 1996; Tebedge 1988; Van Devender et al. 1985.


Last Update: 14 May 2015