Alternative combinations: Helaletes pumilus, Helohippus pumilus, Hyrachyus pumilus, Lophiodon pumilus, Pachynolophus pumilus
Synonyms: Helotherium procyoninum Cope 1871, Hyracotherium osbornianum Cope 1883, Hyracotherium procyoninum Cope 1871, Lambdotherium procyoninum Cope 1871, Lophiotherium ballardi Marsh 1871, Oligotomus cinctus Cope 1873, Orohippus atavus Granger 1908, Orohippus ballardi Marsh 1871, Orohippus cinctus Cope 1873, Orohippus osbornianus Cope 1883, Orohippus procyoninus Cope 1871, Orohippus typicus Granger 1908, Orotherium ballardi Marsh 1871, Pachynolophus ballardi Marsh 1871, Pachynolophus cinctus Cope 1873, Pliolophus cinctus Cope 1873
Full reference: O. C. Marsh. 1871. Notice of some new fossil mammals from the Tertiary Formation. American Journal of Science 2(7):35-44
See also Cope 1871, Cope 1873, Cope 1875, Cope 1883, Froehlich 2002, Gazin 1976, Granger 1908, Hay 1902, Kitts 1957, Marsh 1871, Marsh 1874, Marsh 1892, Matthew 1909, Osborn 1929, Stirton 1940 and Wood 1934
- Orohippus pumilus: Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming
- Helotherium procyoninum:
- Hyracotherium osbornianum: Its type locality is Black's Fork, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
- Lophiotherium ballardi:
- Oligotomus cinctus:
- Orohippus atavus: Its type locality is Cottonwood Creek (Lower Bridger), which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
- Orohippus typicus:
• Eocene of United States (32: Wyoming collections)
Total: 32 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
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