Leptauchenia major Leidy 1856 (oreodont)

Mammalia - Ungulata - Merycoidodontidae

Alternative combination: Pseudocyclopidius major

Synonyms: Brachymeryx feliceps Cope 1877, Cyclopidius densa Loomis 1925, Cyclopidius densus Loomis 1925, Cyclopidius emydinus Cope 1884, Cyclopidius incisivus Scott 1893, Cyclopidius simus Cope 1877, Hadroleptauchenia densa Loomis 1925, Hadroleptauchenia extrema Schultz and Falkenbach 1968, Hadroleptauchenia shanafeltae Schultz and Falkenbach 1968, Leptauchenia densa Loomis 1925, Leptauchenia margeryae Schultz and Falkenbach 1968, Pseudocyclopidius frankforteri Schultz and Falkenbach 1968

Full reference: J. Leidy. 1856. Notice of some remains of extinct vertebrated animals. Proceedings of the Academy of Natural Sciences of Philadelphia 163-165

Belongs to Leptauchenia according to D. R. Prothero and F. Sanchez 2008

See also CoBabe 1996, Cope 1877, Cope 1884, Hay 1902, Koerner 1940, Lander 1998, Leidy 1856, Leidy 1857, Loomis 1924, Loomis 1925, Macdonald 1963, Schultz and Falkenbach 1968, Scott 1893, Scott 1940, Stevens and Stevens 2007 and Thorpe 1937

Sister taxa: Leptauchenia decora, Leptauchenia lullianus, Cyclopidius (Chelonocephalus)

Type specimens:

  • Leptauchenia major: Its type locality is Eagle Nest Butte (Brule), which is in an Arikareean terrestrial horizon in the Brule Formation of South Dakota
  • Brachymeryx feliceps:
  • Cyclopidius emydinus:
  • Cyclopidius incisivus:
  • Cyclopidius simus:
  • Hadroleptauchenia extrema:
  • Hadroleptauchenia shanafeltae:
  • Leptauchenia densa:
  • Leptauchenia margeryae:
  • Pseudocyclopidius frankforteri:

Ecology: ground dwelling herbivore


• Harrisonian of United States (1: Nebraska collection)

• Arikareean of United States (34: Colorado, Montana, Nebraska, South Dakota, Wyoming)

• Oligocene of United States (43: Nebraska, South Dakota, Wyoming)

Total: 78 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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