Mammalia - Artiodactyla - Merycoidodontidae

Synonyms: Cyclopidius (Chelonocephalus) schucherti Thorpe 1921, Cyclopidius brevifacies Cope 1877, Cyclopidius decedens Cope 1884, Cyclopidius loganensis Koerner 1940, Cyclopidius schucherti Thorpe 1921, Hadroleptauchenia eiseleyi Schultz and Falkenbach 1968, Hadroleptauchenia eiselyi Schultz and Falkenbach 1968, Hadroleptauchenia primitiva Schultz and Falkenbach 1968, Leptauchenia brevifacies Cope 1877, Leptauchenia eiseleyi Schultz and Falkenbach 1968, Leptauchenia eiseleyi orellaensis Schultz and Falkenbach 1968, Leptauchenia eiselyi Schultz and Falkenbach 1968, Leptauchenia harveyi Schultz and Falkenbach 1968, Leptauchenia major brevifacies Cope 1877, Leptauchenia major loganensis Koerner 1940, Leptauchenia major schucherti Thorpe 1921, Leptauchenia martini Schultz and Falkenbach 1968, Leptauchenia minora Schlaikjer 1935, Leptauchenia orellaensis Schultz and Falkenbach 1968, Leptauchenia parasimus Schultz and Falkenbach 1968, Pithecistes altageringensis Schultz and Falkenbach 1968, Pithecistes breviceps Cope 1877, Pithecistes brevifacies Cope 1877, Pithecistes copei Schultz and Falkenbach 1968, Pithecistes decedens Cope 1884, Pithecistes facies Cope 1888, Pithecistes mariae Schultz and Falkenbach 1968, Pithecistes tanneri Schultz and Falkenbach 1968, Pseudocyclopidius orellaensis Schultz and Falkenbach 1968

Full reference: J. Leidy. 1856. Notice of remains of extinct Mammalia, discovered by Dr. F. V. Hayden in Nebraska Territory. Proceedings of the Academy of Natural Sciences of Philadelphia 8:88-90

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 1925, Schlaikjer 1935, Schultz and Falkenbach 1968, Scott 1940, Stevens and Stevens 2007, Thorpe 1921 and Thorpe 1937

Sister taxa: Leptauchenia (Sespia), Leptauchenia lullianus, Leptauchenia major, Cyclopidius californicus, Cyclopidius (Chelonocephalus)

Type specimens:

• Leptauchenia decora: Its type locality is Eagle Nest Butte (Sharps Fm.), which is in an Arikareean fluvial horizon in the Sharps Formation of South Dakota
• Cyclopidius (Chelonocephalus) schucherti: YPM 10123, a skull. Its type locality is Near Hermosa, which is in an Oligocene terrestrial horizon in South Dakota.
• Cyclopidius loganensis: Its type locality is Fort Logan, which is in an Arikareean terrestrial horizon in Montana.
• Hadroleptauchenia eiseleyi: UNSM 28208, a partial skull (Partial left maxilla with P4-M3). Its type locality is Lyman Beaver Locality, which is in an Orellan terrestrial horizon in the Brule Formation of Nebraska.
• Hadroleptauchenia primitiva: Its type locality is Hay Creek, which is in a Whitneyan terrestrial horizon in the Brule Formation of South Dakota.
• Leptauchenia harveyi: Its type locality is UNSM Sx-15 (Whitney A), which is in a Whitneyan terrestrial horizon in the Brule Formation of Nebraska.
• Leptauchenia martini: Its type locality is Potato Creek (Sharps A), which is in a Geringian fluvial horizon in the Sharps Formation of South Dakota.
• Leptauchenia minora: MCZ 2841, a partial skull. Its type locality is Bear Creek Mountain (East), which is in an Arikareean terrestrial horizon in the Harrison Formation of Wyoming.
• Leptauchenia parasimus:
• Pithecistes altageringensis: Its type locality is Little Muddy Creek (Niobrara County), which is in an Arikareean terrestrial horizon in Wyoming.
• Pithecistes breviceps: AMNH 8129, a mandible (m3).
• Pithecistes brevifacies: AMNH 8129, a mandible (m3).
• Pithecistes copei: F:AM 34483, a partial skull. Its type locality is Big Muddy Creek, which is in an Arikareean terrestrial horizon in Wyoming.
• Pithecistes decedens: AMNH 8130, a maxilla.
• Pithecistes facies:
• Pithecistes mariae: Its type locality is Sheep Mountain (Sharps A), which is in a Geringian terrestrial horizon in the Sharps Formation of South Dakota.
• Pithecistes tanneri: UNSM 28451, a partial skull. Its type locality is UNSM Mo-111 (Upper Whitney), which is in a Whitneyan terrestrial horizon in the Brule Formation of Nebraska.
• Pseudocyclopidius orellaensis: Its type locality is Douglas Area Brule (5-6a), which is in an Orellan terrestrial horizon in the Brule Formation of Wyoming.

Ecology: ground dwelling herbivore

Distribution:

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Specimen images are retrieved through the ePANDDA API.