Original sentence: Hayoceros is an extinct pronghorn from Nebraska
Edited sentence: Hayoceros is an extinct genus of the family Antilocapridae, endemic to North America during the Eocene-Oligocene epochs (1.8 mya—300,000 years ago), existing for approximately.Hayoceros was named by Skinner (1942) and named as a subgenus of Tetrameryx by Frick 1937; raised to genus level.It was assigned to Antilocapridae by Skinner (1942) and Carroll (1988)