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
See also Cope 1873, Gazin 1976, Hay 1902, 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
- 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.
Total: 19 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
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