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Leptauchenia (Sespia)

Mammalia - Merycoidodontidae

Taxonomy
Leptauchenia (Sespia) was named by Stock (1930) [named as subgenus of Leptauchenia by Stock 1930a; transferred to Cyclopidius by Schlaikjer 1935, Thorpe 1937]. It is the type subgenus of Sespiini.

It was reranked as Sespia by Schultz and Falkenbach (1968), McKenna and Bell (1997), Lander (1998), Hoffman and Prothero (2004) and Stevens and Stevens (2007).

It was assigned to Leptauchenia by Stock (1930); to Sespiini by Schultz and Falkenbach (1968) and McKenna and Bell (1997); to Merycoidodontidae by Lander (1998); and to Leptaucheniinae by Hoffman and Prothero (2004) and Stevens and Stevens (2007).

Synonymy list
YearName and author
1930Leptauchenia (Sespia) Stock p. 38
1968Sespia Schultz and Falkenbach p. 239
1997Sespia McKenna and Bell p. 409
1998Sespia Lander
2004Sespia Hoffman and Prothero p. 156
2007Sespia Stevens and Stevens p. 158

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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
subgenusSespia

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.

Subg. †Leptauchenia (Sespia) Stock 1930
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Diagnosis
ReferenceDiagnosis
J. M. Hoffman and D. R. Prothero 2004Small-sized leptauchenines with extremely hypsod-ont cheek teeth. Because of their smaller size relative to Leptauchenia,they also have a smaller facial vacuity, a shallower malar, and a smallertympanic bulla. The paroccipital process, however, is more inflatedthan in Leptauchenia. The styles on M1-3 and the ribs and stylids onm1-3 are much less prominent than in Leptauchenia. M3 is lost inmany specimens.