''Haplohippus'' is an extinct genus of the modern

horse The horse (''Equus ferus caballus'') is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of ''Equus ferus''. The horse has evolved over the past 45 to 55 mi ...

family

Equidae Equidae (commonly known as the horse family) is the Taxonomy (biology), taxonomic Family (biology), family of Wild horse, horses and related animals, including Asinus, asses, zebra, zebras, and many extinct species known only from fossils. The fa ...

, that lived in the

Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...

, from 42 to 38 million years ago. Fossil remains of ''Haplohippus'' have been found in the

Clarno Formation John Day Fossil Beds National Monument is a National monument (United States), U.S. national monument in Wheeler County, Oregon, Wheeler and Grant County, Oregon, Grant counties in east-central Oregon. Located within the John Day River basin an ...

, part of the

John Day Fossil Beds National Monument John Day Fossil Beds National Monument is a U.S. national monument in Wheeler and Grant counties in east-central Oregon. Located within the John Day River basin and managed by the National Park Service, the park is known for its well-preserve ...

of the Northwestern United States. While ''Haplohippus'' is quite similar to '' Orohippus'', it is considered more primitive in character than '' Epihippus''.MacFadden, Bruce J. 1976 "Cladistic Analysis of Primitive Equids, with Notes on Other Perissodactyls" ''Systematic Zoology'' 25(1):1-14

References

Eocene horses Eocene Perissodactyla Eocene mammals of North America Paleogene geology of Oregon Prehistoric placental genera John Day Fossil Beds National Monument Extinct mammals of North America Eocene genus extinctions Eocene extinctions Clarno Formation {{paleo-oddtoedungulate-stub