Helaletes nanus Marsh 1871 (odd-toed ungulate)

Mammalia - Perissodactyla

Alternative combination: Lophiodon nanus

Synonyms: Helaletes boops Marsh 1872, Hyrachyus boops Marsh 1872

Full reference: O. C. Marsh. 1871. Notice of some new fossil mammals from the Tertiary Formation. American Journal of Science 2(7):35-44

Belongs to Helaletes according to M. W. Colbert and R. M. Schoch 1998

See also Cope 1873, Gazin 1976, Marsh 1871, Marsh 1872, McCarroll et al. 1996, Peterson 1919, Radinsky 1963, Schoch 1984, Schoch 1989, Stucky 1984, Troxell 1922, Wood 1934 and Wortman and Earle 1893

Sister taxa: Helaletes medius, Helaletes mongoliensis

Type specimens:

  • Helaletes nanus: YPM 11080, a maxilla (fragments of both upper jaws with all the cheek-teeth represented on the right side). Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
  • Helaletes boops: YPM 11807, a partial skeleton (considerable portion of the skull, lower jaws and other fragments of the skeleton). Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.

Ecology: ground dwelling browser

Distribution:

• Eocene of United States (19: Colorado, Montana, Nevada, Utah, Wyoming collections)

Total: 19 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.


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