Tetrameryx is an extinctgenus of the North Americanartiodactyl familyAntilocapridae, known fromMexico,^[2] thewestern United States, andSaskatchewan inCanada.^[1]

Tetrameryx Temporal range:1.8–0.012 Ma[1] PreꞒ Ꞓ O S D C P T J K Pg N ↓
Depiction ofT. shuleri based on modernpronghorns
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Family:	Antilocapridae
Genus:	†Tetrameryx Lull, 1921
Species
T. irvingtonensisStirton, 1939 T. knoxensisHibbard andDalquest, 1960 T. mooseriDalquest, 1974 T. shuleriLull, 1921 T. tacubayensisMooser and Dalquest, 1975

The name means "four [horned] ruminant", referring to the division of each horn near its base into two prongs; inT. shuleri, the rear prong is much longer.^[3] 5 species are known.

One member of the genus,T. shuleri, survived until about 12,000 years ago, and was present whenPaleo-Indians reached North America.^[4] Although approximately the same size as the livingpronghorn, the limb bones are somewhat more robust, suggesting that its running speed was slower than living pronghorn.^[5]