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Leptauchenia

Mammalia - Merycoidodontidae

Synonyms
Synonymy list
YearName and author
1856Leptauchenia Leidy
1877Pithecistes Cope p. 219
1877Brachymeryx Cope p. 220
1877Cyclopidius Cope p. 221
1878Brachymeryx Cope
1878Pithecistes Cope
1884Cyclopidius Cope p. 546
1884Leptauchenia Cope p. 546
1884Pithecistes Cope p. 557
1902Cyclopidius Hay p. 670
1902Leptauchenia Hay p. 670
1913Cyclopidius Scott p. 361
1913Leptauchenia Scott p. 361
1937Leptauchenia Thorpe p. 234
1937Cyclopidius Thorpe p. 241
1940Leptauchenia Scott p. 690 figs. Plates LXXIV , LXXV
1968Hadroleptauchenia Schultz and Falkenbach
1968Pseudocyclopidius Schultz and Falkenbach
1968Pithecistes Schultz and Falkenbach p. 258 figs. Figures 32, 38, 40, 53 ( skulls, mandibles, and dentitions)
1968Leptauchenia Schultz and Falkenbach p. 272 figs. Figures 33, 38, 40, 41, 53 ( skulls, mandibles, and dentition) ; 43 ( skeletal elements)
1968Cyclopidius Schultz and Falkenbach p. 296 figs. Figures 34, 38, 40, 41
1968Hadroleptauchenia Schultz and Falkenbach p. 303 figs. Fgures 34, 35, 38, 40, 53, 55 (skulls, mandibular rami), and 43 (limbs)
1968Pseudocyclopidius Schultz and Falkenbach p. 323 figs. Figures 36-40, 53 (skull, mandibular rami), and 43 (limbs)
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()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
subclassSynapsida
Therapsida()
infraorderCynodontia()
Mammaliamorpha
RankNameAuthor
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Scrotifera
Euungulata
Artiodactylamorpha
Artiodactyla()
familyMerycoidodontidae
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.

G. †Leptauchenia Leidy 1856
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Subg. †Leptauchenia (Sespia) Stock 1930
Leptauchenia decora Leidy 1856
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Invalid names: Cyclopidius (Chelonocephalus) schucherti Thorpe 1921 [synonym], Cyclopidius loganensis Koerner 1940 [synonym], Hadroleptauchenia eiseleyi Schultz and Falkenbach 1968 [synonym], Hadroleptauchenia primitiva Schultz and Falkenbach 1968 [synonym], Leptauchenia harveyi Schultz and Falkenbach 1968 [synonym], Leptauchenia martini Schultz and Falkenbach 1968 [synonym], Leptauchenia minora Schlaikjer 1935 [synonym], Leptauchenia parasimus Schultz and Falkenbach 1968 [synonym], Pithecistes altageringensis Schultz and Falkenbach 1968 [synonym], Pithecistes breviceps Loomis 1925 [synonym], Pithecistes brevifacies Cope 1877 [synonym], Pithecistes copei Schultz and Falkenbach 1968 [synonym], Pithecistes decedens Cope 1884 [synonym], Pithecistes facies Cope 1888 [synonym], Pithecistes mariae Schultz and Falkenbach 1968 [synonym], Pithecistes tanneri Schultz and Falkenbach 1968 [synonym], Pseudocyclopidius orellaensis Schultz and Falkenbach 1968 [synonym]
Leptauchenia lullianus Thorpe 1921
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Invalid names: Cyclopidius quadratus Koerner 1940 [synonym]
Leptauchenia major Leidy 1856
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Invalid names: Brachymeryx feliceps Cope 1877 [synonym], Cyclopidius emydinus Cope 1884 [synonym], Cyclopidius incisivus Scott 1893 [synonym], Cyclopidius simus Cope 1877 [synonym], Hadroleptauchenia extrema Schultz and Falkenbach 1968 [synonym], Hadroleptauchenia shanafeltae Schultz and Falkenbach 1968 [synonym], Leptauchenia densa Loomis 1925 [synonym], Leptauchenia margeryae Schultz and Falkenbach 1968 [synonym], Pseudocyclopidius frankforteri Schultz and Falkenbach 1968 [synonym]
Pseudocyclopidius lullianus expiratus Schultz and Falkenbach 1968
Invalid names: Brachymeryx Cope 1877 [synonym], Cyclopidius Cope 1877 [synonym], Hadroleptauchenia Schultz and Falkenbach 1968 [synonym], Pithecistes Cope 1877 [synonym], Pseudocyclopidius Schultz and Falkenbach 1968 [synonym], Pseudoleptauchenia Unknown [objective synonym]
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.