Mammalia - Artiodactyla - Merycoidodontidae
Alternative combinations: Merychyus harrisonensis, Merycoides harrisonensis, Ticholeptus harrisonensis
Synonyms: Eporeodon major relictus Loomis 1924, Eporeodon relictus Loomis 1924, Merychyus siouxensis Loomis 1924, Merycoides relictus Loomis 1924, Paramerychyus relictus Loomis 1924
Full reference: O. A. Peterson. 1907. The Miocene Beds of Western Nebraska and Eastern Wyoming and Their Vertebrate Faunae. Annals of Carnegie Museum 4(3):21-72
Belongs to Paramerychyus according to M. S. Stevens et al. 2023
See also Lander 1998, Loomis 1923, Loomis 1924, Peterson 1907, Schultz and Falkenbach 1947, Stevens and Stevens 2007 and Thorpe 1937
Sister taxa: none
Type specimens:
- Paramerychyus harrisonensis: CM 1341, a partial skull (a fairly well preserved skull which has been somewhat crushed vertically and is without the lower jaws). Its type locality is Van Tassel (Lower), which is in a Harrisonian terrestrial horizon in Wyoming.
- Eporeodon relictus: AMNH 13813, a partial skull (a "considerably mutilated skull" [Thorpe 1937]; Partial skull with C/(rt.)-M3). Its type locality is American Horse Creek, which is in a Harrisonian terrestrial horizon in the Harrison Formation of South Dakota.
- Merychyus siouxensis: AMNH 13774, a skull (Skull with I2-M3).
Ecology: ground dwelling herbivore
Distribution:
• Harrisonian of United States (12: Montana, Nebraska, South Dakota, Texas, Wyoming collections)
• Oligocene of United States (2: Nebraska, South Dakota)
Total: 14 collections including 15 occurrences
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.