Tanyorhinus harundivorax Cook, 1926

Mihlbachler, Matthew C., 2008, Species Taxonomy, Phylogeny, and Biogeography of the Brontotheriidae (Mammalia: Perissodactyla), Bulletin of the American Museum of Natural History 311 (1), pp. 1-475 : 336

Tanyorhinus harundivorax Cook, 1926

HOLOTYPE: DMNH 552 , a partial left mandible with p3–m1.

TYPE LOCALITY: DMNH locality 225, Two bar Spring, 3/ 4 miles northeast, Moffat County, Colorado.

AGE: Middle Eocene (early Uintan land mammal ‘‘age’’).

DETERMINATION: Nomen dubium, holotype lacks diagnostic characters.

REMARKS

Cook (1926) erected a new species, Tanyorhinus harundivorax , from a partial mandible (DMNH 552) (fig. 170). The p3 lacks a metaconid and it has a nearly straight paralophid and metalophid. The p4 has a lingually arching paralophid and protolophid, and a large metaconid. These details are consistent with a number of Late Bridgerian and early Uintan brontotheres such as Telmatherium validus , Sthenodectes incisivum , Wickia brevirhinus , and Sphenocoelus uintensis . The teeth are somewhat more slender than those typical of Sthenodectes incisivum and are more similar to those of Sphenocoelus uintensis in their proportions. This specimen could belong to either Sphenocoelus uintensis or Wickia brevirhinus .