Synonyms: Merychyus calaminthus Jahns 1940, Merychyus paniensis Loomis 1924, Merychyus verrucomalus Stevens 1970
Full reference: O. A. Peterson. 1907. Annals of Carnegie Museum 4(3)
- Merychyus minimus: Its type locality is Niobrara Canyon, which is in a Harrisonian terrestrial horizon in the Upper Harrison Beds Formation of Nebraska
- Merychyus calaminthus: Its type locality is Tick Canyon (CIT 201), which is in an Arikareean terrestrial horizon in the Tick Canyon Formation of California.
- Merychyus paniensis:
- Merychyus verrucomalus: Its type locality is Main Fork of Cottonwood Creek, which is in a Hemingfordian terrestrial horizon in the Runningwater Formation of Nebraska.
Ecology: ground dwelling herbivore
Average measurements (in mm): M1 10.3 x 9.6, M2 12.8 x 11.0, M3 14.7 x 11.0, m1 10.1 x 7.4, m2 12.8 x 7.7, m3 19.8 x 8.9