Hyracotherium (/ˌhaɪrəkoʊˈθɪəriəm, -kə-/ HY-rək-o-THEER-ee-əm; "hyrax-like beast") is an extinct genus of very small (about 60 cm in length) perissodactyl...

only species is E. angustidens, which was long considered a species of Hyracotherium. Its remains have been identified in North America and date to the Early...

referred to in earlier literature as Hyracotherium sandrae, but Froehlich, arguing that the traditional genus Hyracotherium was not monophyletic, reassigned...

(Cope, 1881) †P. montanum Wortman, 18961 Synonyms Hyracotherium venticolum Cope, 1881 Hyracotherium vasacciense venticolum Kitts, 1956 Eohippus venticolum...

present day. The earliest known member of the family Equidae was the Hyracotherium, which lived between 45 and 55 million years ago, during the Eocene...

developed a hoof at this point, rather it still had pads as seen in Hyracotherium and Orohippus. The face of Mesohippus was longer and larger than earlier...

different from Hyracotherium and a basal perissodactyl. It was later believed to be an equid and referred to Hyracotherium (Hyracotherium tapirinum, incl...

pre-existing species. For example, it is sometimes claimed that the extinct Hyracotherium, which was an early horse that shares a common ancestor with the modern...

early Eocene, 54 million years ago. They had been assigned to the genus Hyracotherium, but the type species of that genus is now considered not a member of...

Eocene epoch, 54 million years ago. They were once assigned to the genus Hyracotherium, but the type species of that genus is now regarded as a palaeothere...

bulkier version of its contemporary, the horse-like palaeothere Hyracotherium. Like Hyracotherium, it ate leaves and had five-toed front legs and three-toed...

were a prominent feature of Eocene marine ecosystems. Moeritherium Hyracotherium Brontotherium Basilosaurus Andrewsarchus Borealosuchus Gastornis Pakicetus...

Hippomorpha Family: †Palaeotheriidae Bonaparte, 1850 Genera Anchilophus Hyracotherium Idiodontherium Leptolophus Lijiangia Lophiotherium Pachynolophus Palaeotherium...

zones. During the temporal unit, many genera of basal equoids such as Hyracotherium, Pliolophus, Cymbalophus, and Hallensia made their first appearances...

new exhibit of fossil bones opened in 1957, and displayed fossils of Hyracotherium, a horse ancestor, and Coryphodon, a large hippo-like animal that lived...

Biology, 1:139–185. MacFadden, B. J. 1986. Fossil horses from “Eohippus” (Hyracotherium) to Equus: scaling, Cope's Law, and the evolution of body size. Paleobiology...

Pellucidarian equivalent are known. It first appeared in At the Earth's Core. Hyracotherium (Orthopi) — It first appeared in At the Earth's Core. Ichthyosaurus...

(phylogeny). This evolutionary sequence starts with a small animal called Hyracotherium (commonly referred to as Eohippus), which lived in North America about...

Allosaurus, Cynodont, Thrinaxodon, Eomaia, Carpolestes, Diatryma, Hyracotherium and Hyaenodontid. This episode chronicles primates that would evolve...

55–45 Ma Early Eocene First creodonts. Earliest equid, Eohippus or Hyracotherium. First perching birds. First bats. The Andes begin to rise. Divergence...

horse to illustrate this point, as the unbroken connection between Hyracotherium (formerly called Eohippus) and Equus provides an apparent linear path...

that helped trace the evolution of the horse from the small 5-toed Hyracotherium of the Eocene to the much larger single-toed modern horses of the genus...

Huerfano Formation Stratigraphic range: Paleogene Hyracotherium vasacciense (fossil horse) from the Huerfano Formation, Lower Eocene Type Formation Location...

been preserved. For example, it is sometimes claimed that the extinct Hyracotherium (an ancient horse-like animal commonly known as an eohippus) is pseudoextinct...

forming the earliest stages in the evolution of the horse, coming below Hyracotherium (see Equidae). As ancestors of the artiodactyl section of the Ungulata...

Family Pachynolophidae Superfamily Equoidea Family Palaeotheriidae Genus Hyracotherium Genus Propalaeotherium Genus Palaeotherium Family Equidae Genus Miohippus...

the lower San Jose Formation of the San Juan Basin. The presence of Hyracotherium teeth dates the formation to the late Paleocene or early Eocene. The...

Caenolambda jepseni Coryphodon armatus Coryphodon sp. Perissodactyla Hyracotherium vasacciense Minippus index Placentalia Hyopsodus cf. wortmani Hyopsodus...

it resembled other, basal forms of the order Perissodactyla, such as Hyracotherium or Sifrhippus, some of which were well-studied members of the early...

Hemipristis †Hemisurcula †Hesperotestudo Heterodontus Hexaplex Hipponix Homo †Hyracotherium Isurus †Jefitchia Kellia Kuphus Laevicardium Lamna Latirus Lepisosteus...