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 ungulates that was found in the London Clay formation. This small, fox-sized animal is (for some scientists) considered to be the earliest known member of Equidae before the type species, H. leporinum, was reclassified as a palaeothere, a perissodactyl family basal to both horses and brontotheres. The remaining species are now thought to belong to different genera, such as Eohippus, which had previously been synonymised with Hyracotherium.
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...
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...
in the tropics and subtropics today.[citation needed] Moeritherium Hyracotherium Brontotherium Basilosaurus Andrewsarchus Borealosuchus Gastornis Pakicetus...
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...
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...
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...
bulkier version of its contemporary, the horse-like palaeothere Hyracotherium. Like Hyracotherium, it ate leaves and had five-toed front legs and three-toed...
different from Hyracotherium and a basal perissodactyl. It was later believed to be an equid and referred to Hyracotherium (Hyracotherium tapirinum, incl...
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...
(phylogeny). This evolutionary sequence starts with a small animal called Hyracotherium (commonly referred to as Eohippus), which lived in North America about...
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...
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...
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...
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...
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...
Allosaurus, Cynodont, Thrinaxodon, Eomaia, Carpolestes, Diatryma, Hyracotherium and Hyaenodontid. This episode chronicles primates that would evolve...
Ma – 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...
Family Pachynolophidae Superfamily Equoidea Family Palaeotheriidae Genus Hyracotherium Genus Propalaeotherium Genus Palaeotherium Family Equidae Genus Miohippus...
it resembled other, basal forms of the order Perissodactyla, such as Hyracotherium or Sifrhippus, some of which were well-studied members of the early...
been reported from the formation: Ferae Didymictis sp. Perissodactyla Hyracotherium sp. Placentalia Phenacodus intermedius List of fossiliferous stratigraphic...
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