Alternative combinations: Cynarctus acridens, Notharctus acridens
Synonyms: Cynarctoides mustelinus Matthew 1932, Cynarctus mustelinus Matthew 1932
Full reference: E. H. Barbour and H. J. Cook. 1914. Nebraska Geological Survey 4(15)
- Cynarctoides acridens: Its type locality is American Museum-Cook Quarry, which is in a Harrisonian terrestrial horizon in the Upper Harrison Beds Formation of Nebraska
- Cynarctus mustelinus: Its type locality is Thomson Quarry, which is in a Hemingfordian terrestrial horizon in the Sheep Creek Formation of Nebraska.
Ecology: ground dwelling carnivore-omnivore
Average measurements (in mm): P4 7.55 x 3.74, M1 5.97 x 7.76, M2 4.88 x 7.03, p4 5.62 x 2.47, m1 8.44 x 3.83, m2 5.69 x 3.59