Original sentence: Hexameryx is an extinct genus of antilocaprid artiodactyl with six horns, from the Pliocene of the United States
Edited sentence: Hexameryx is an extinct genus of the family Antilocapridae, endemic to North America during the Pliocene epoch (5.3—4.9 mya), existing for approximately.Hexameryx was a six horned animal.Hexameryx was named by White (1941).It was assigned to Antilocapridae by White (1941), Webb (1973), Carroll (1988) and Janis and Manning (1998).It was synonymized subjectively with Hexobelomeryx by Simpson (1945), Ferrusquia (1978) and Ahearn (1988).Its type is Hexameryx simpsoni.Mendoza for body mass and estimated to have a weight of:.Specimen 1:.Specimen 2:.Specimen 3:.Three specimens were examined by M