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Leptauchenia major

Mammalia - Ungulata - Merycoidodontidae

Taxonomy
Leptauchenia major was named by Leidy (1856). It is a 3D body fossil. Its type locality is Eagle Nest Butte (Brule), which is in an Arikareean terrestrial horizon in the Brule Formation of South Dakota.

It was recombined as Pseudocyclopidius major by Schultz and Falkenbach (1968).

Synonyms
Synonymy list
YearName and author
1856Leptauchenia major Leidy p. 163
1857Leptauchenia major Leidy p. 89
1877Brachymeryx feliceps Cope p. 220
1877Cyclopidius simus Cope p. 221
1884Leptauchenia major Cope p. 546
1884Cyclopidius simus Cope p. 547
1884Cyclopidius emydinus Cope p. 553
1893Cyclopidius incisivus Scott p. 661
1902Cyclopidius emydinus Hay p. 670
1902Leptauchenia major Hay p. 670
1902Cyclopidius incisivus Hay p. 671
1902Cyclopidius simus Hay p. 671
1925Leptauchenia densa Loomis
1935Cyclopidius densa Schlaikjer
1937Leptauchenia major Thorpe p. 238 figs. PI. XXXVI, figs. 5-6; PL XXXVII, figs. 6-8
1937Cyclopidius densus Thorpe p. 243 figs. Figs. 170-172; PI. XLIX
1937Cyclopidius simus Thorpe p. 249 figs. Pis. XXXVII, figs. 10-1 ; PI. XXXVIII, figs. 1-3
1940Leptauchenia major Scott p. 705
1968Cyclopidius emydinus Schultz and Falkenbach
1968Hadroleptauchenia densa Schultz and Falkenbach
1968Hadroleptauchenia extrema Schultz and Falkenbach
1968Hadroleptauchenia shanafeltae Schultz and Falkenbach
1968Leptauchenia margeryae Schultz and Falkenbach
1968Pseudocyclopidius frankforteri Schultz and Falkenbach
1968Pseudocyclopidius major Schultz and Falkenbach
1968Cyclopidius simus Schultz and Falkenbach p. 298 figs. Figures 34, 38, 40
1996Leptauchenia major CoBabe
1998Leptauchenia major Lander
2007Leptauchenia major Stevens and Stevens p. 158
2008Leptauchenia major 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()
Amniota
RankNameAuthor
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
orderUngulata(Linnaeus 1766)
orderArtiodactyla()
familyMerycoidodontidae
subfamilyLeptaucheniinaeSchultz and Falkenbach 1940
genusLeptauchenia
speciesmajor

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
W. B. Scott 1893 (Cyclopidius incisivus)Like O. simus, but having two small incisors in each premaxillary; the latter bones also of a different shape from those of the former species.
D. R. Prothero and F. Sanchez 2008Medium to large leptaucheniines (P2-M3 length = 51-62 mm, M1-3 lengths = 34-44 mm, M1-2 lengths = 22-27 mm, and skull lengths = 105-125 mm) with relatively more robust zygomatic arches and larger orbits; teeth hypsodont to very hypsodont; styles on M1-3 and stylids on m1-3 well developed. Contrary to CoBabe’s (1996, p. 578) diagnosis, the presence or absence of the M3 is highly variable in both this species and L. decora.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialo
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: herbivoref
Created: 2005-08-31 14:37:21
Modified: 2005-08-31 16:37:21
Source: f = family, o = order, c = class, subp = subphylum
References: Carroll 1988, Hendy et al. 2009, Nowak 1999, Lander 1998

Age range: base of the Whitneyan to the top of the Harrisonian or 33.30000 to 20.43000 Ma

Collections (78 total)


Time interval Ma Country or state Original ID and collection number
Whitneyan33.3 - 30.8USA (South Dakota) Hadroleptauchenia primitiva (17317 17339 17343 17380) Pseudocyclopidius frankforteri (17329 17378)
Whitneyan33.3 - 30.8USA (Nebraska) Hadroleptauchenia primitiva (17374 17398 17401 17402 17403 17407 17413 17419 17422 17424) Pseudocyclopidius frankforteri (17386 17417)
Geringian30.8 - 26.3USA (South Dakota) Cyclopidius simus (17636 17637 17641 17644 17653) Hadroleptauchenia extrema (17593) Hadroleptauchenia shanafeltae (17589 17668) Pseudocyclopidius lullianus (17505) Pseudocyclopidius major (17592 17663)
Geringian30.8 - 26.3USA (Nebraska) Hadroleptauchenia densa (17482 17576) Hadroleptauchenia shanafeltae (17577 17714 17728) Pseudocyclopidius lullianus (17713) Pseudocyclopidius major (17525 17570 17595 17694 17707 17710 17720)
Geringian30.8 - 26.3USA (Wyoming) Pseudocyclopidius lullianus (17446)
Arikareean30.8 - 20.43USA (Colorado) Pseudocyclopidius major (17500)
Arikareean30.8 - 20.43USA (Nebraska) Cyclopidius densa (17515) Cyclopidius shanafeltae (17514) Hadroleptauchenia densa (17530) Hadroleptauchenia shanafeltae (17572) Leptauchenia sp. (17513) Pseudocyclopidius lullianus (17477 17569 17669 17692) Pseudocyclopidius major (17473 17538 17568 17598 17602 17716 17717 17719)
Arikareean30.8 - 20.43USA (South Dakota) Hadroleptauchenia shanafeltae (17520 17606) Leptauchenia major (type locality: 17496)
Arikareean30.8 - 20.43USA (Montana) Cyclopidius emydinus (17722) Cyclopidius simus (17478)
Arikareean30.8 - 20.43USA (Wyoming) Cyclopidius densa (17467) Cyclopidius lullianus (17472 17667) Hadroleptauchenia densa (17502 17532 17691 17703) Hadroleptauchenia extrema (17686) Leptauchenia major (17727) Pseudocyclopidius lullianus (17698)
early Early Arikareean30.8 - 20.43USA (Nebraska) Leptauchenia major (156729)
Harrisonian24.8 - 20.43USA (Nebraska) Pseudocyclopidius lullianus (17704)