Original sentence: The American cheetahs (genus Miracinonyx) were at least two species of feline, morphologically similar to the modern cheetah
Edited sentence: Miracinonyx (American cheetahs) is an extinct genus of the family Felidae, endemic to North America during the Early Pliocene epoch (1.8 mya—11,000 years ago), existing for approximately.There were at least two species of feline, morphologically similar to the modern cheetah