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Leptauchenia major

Mammalia - Merycoidodontidae

Taxonomy
Leptauchenia major was named by Leidy (1856). It is a 3D body fossil. Its type locality is Eagle Nest Butte (Sharps Fm.), which is in an Arikareean fluvial horizon in the Sharps 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 figs. not figured
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()
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
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.

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]
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
Reproduction: viviparoussubc
Created: 2005-08-31 14:37:21
Modified: 2005-08-31 16:37:21
Source: f = family, o = order, subc = subclass, c = class, subp = subphylum
References: Carroll 1988, Lander 1998, Nowak 1999, Lillegraven 1979, Hendy et al. 2009

Age range: base of the Whitneyan to the top of the Geringian or 33.30000 to 26.30000 Ma

Collections (68 total)


Time interval Ma Country or state Original ID and collection number
Whitneyan33.3 - 30.8USA (Nebraska) Hadroleptauchenia primitiva (17401 17402 17403 17407 17413 17422 17424) Hadroleptauchenia shanafeltae (17374) Hadroleptauchenia shanafeltae, Pseudocyclopidius major (17398) Pseudocyclopidius frankforteri (17386 17417 17419)
Whitneyan33.3 - 30.8USA (South Dakota) Hadroleptauchenia primitiva (17317 17339 17343 17380) Pseudocyclopidius frankforteri (17329 17378)
Whitneyan - Arikareean33.3 - 20.43USA (Nebraska) Pseudocyclopidius major (17716)
Geringian30.8 - 26.3USA (South Dakota) Cyclopidius simus (17636 17637 17641 17644 17653) Hadroleptauchenia extrema (17593) Hadroleptauchenia shanafeltae (17589 17668) 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)
Arikareean30.8 - 20.43USA (Montana) Cyclopidius emydinus (17722) Cyclopidius simus (17478)
Arikareean30.8 - 20.43USA (Colorado) Pseudocyclopidius major (17500)
Arikareean30.8 - 20.43USA (Nebraska) Cyclopidius densa (17515) Hadroleptauchenia densa (17530) Hadroleptauchenia shanafeltae (17572) Hadroleptauchenia shanafeltae, Pseudocyclopidius major (17568 17717) Leptauchenia margeryae (17569) Leptauchenia sp. (17513) Pseudocyclopidius major (17473 17538 17598 17602 17719)
Arikareean30.8 - 20.43USA (South Dakota) Hadroleptauchenia shanafeltae (17520 17606) Leptauchenia major (type locality: 17496)
Arikareean30.8 - 20.43USA (Wyoming) Cyclopidius densa (17467) Hadroleptauchenia densa (17502 17532 17703) Hadroleptauchenia extrema (17686) Leptauchenia major (17727)
early Early Arikareean30.8 - 20.43USA (Nebraska) Leptauchenia major (156729)
early Early Arikareean - late Early Arikareean30.8 - 20.43USA (Wyoming) Hadroleptauchenia densa (17691)