The Genus Hyracotherium, also known as the Eohippus, is an extinct genus of horse-like animals that existed during the early Eocene epoch. It is considered to be the earliest known ancestor of modern-day horses. Some common synonyms for the Genus Hyracotherium include Eohippus, Hyracotherium sylvestre, and Orohippus pumilus. These synonyms are often used interchangeably in scientific literature and research to refer to this ancient group of animals. The significance of studying the Genus Hyracotherium lies in its importance in understanding the evolution of horses and their relationship with other animal species over time.