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Leptauchenia

Mammalia - Artiodactyla - Merycoidodontidae

Synonyms
Synonymy list
YearName and author
1856Leptauchenia Leidy
1877Pithecistes Cope p. 219
1877Brachymeryx Cope p. 220
1877Cyclopidius Cope p. 221
1878Brachymeryx Cope
1878Cyclopidius Cope
1878Pithecistes Cope
1884Cyclopidius Cope p. 546
1884Leptauchenia Cope p. 546
1884Pithecistes Cope p. 557
1921Chelonocephalus Thorpe p. 415
1940Leptauchenia Scott p. 690 figs. Plates LXXIV , LXXV
1968Hadroleptauchenia Schultz and Falkenbach
1968Pithecistes Schultz and Falkenbach
1968Pseudocyclopidius Schultz and Falkenbach
1997Cyclopidius McKenna and Bell p. 409
1997Hadroleptauchenia McKenna and Bell p. 409
1997Pithecistes McKenna and Bell p. 409
1997Pseudocyclopidius McKenna and Bell p. 409
1998Leptauchenia Lander
2007Leptauchenia Stevens and Stevens p. 158
2008Leptauchenia Prothero and Sanchez

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
suborderTylopoda()
superfamilyOreodontoidea
familyMerycoidodontidaeThorpe 1923
subfamilyLeptaucheniinaeSchultz and Falkenbach 1940
genusLeptauchenia

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
D. R. Prothero and F. Sanchez 2008(modified from CoBabe, 1996, and Lander, 1998) Small to moderate-sized oreodonts with a greatly enlarged pair of nasal-facial vacuities enclosed by the nasal, frontal, premaxillary, and maxillary bones; fan-shaped occipital region; orbit elevated high on the skull; inflated auditory bullae; external auditory meatus tube long, large, elevated and posteriorly directed; deep zygomatic arch and malar bone; teeth hypsodont to extremely hypsodont, with thin occlusal enamel. I1 reduced or absent; P1-3 anteriorly shortened, nearly square, with central
fossette; M1-3 lingual selenes rounded, closely appressed, broadly con- tinuous, forming a single crest extending toward the mesostyle, and off- set posteriorly relative to labial selenes. Differs from Sespia in having a larger body size, wider and thicker zygomatic arch (malar bone) than Sespia, and teeth which are not as hypsodont, but have more prominent styles on M1-3 and stylids on m1-3.