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Merychyus siouxensis

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Merychyus siouxensis was named by Loomis (1924). Its type specimen is AMNH 13774, a skull (Skull with I2-M3), and it is a 3D body fossil.

It was synonymized subjectively with Merycoides harrisonensis by Lander (1998).

Synonyms
Synonymy list
YearName and author
1924Merychyus siouxensis Loomis
1928Phenacocoelus munroensis Peterson
1947Merychyus siouxensis Schultz and Falkenbach p. 223 figs. 1, 7, 13, 15-17

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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
orderArtiodactyla()
suborderTylopoda()
superfamilyOreodontoidea
familyMerycoidodontidaeThorpe 1923
subfamilyMerychyinae
genusMerychyus
speciessiouxensis

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
C. B. Schultz and C. H. Falkenbach 1947SKULL: Larger than that of M. approximate size of large examples of M. arenarum; nasals heavier than those of M. crabilli; lacrimal fossa deep and large; pre-lacrimal vacuity moderately large; post- glenoid process decidedly heavier than that of M. crabilli; occipital condyles moderately large, larger than in M. crabilli,·bulla large and well inflated.
MANDIBLE: :Larger than that of M.crabilli.
DENTITION: Superior and inferior series decidedly longer and heavier than those of M. crabilli; closer to those of M. arenarum.
LIMBS:Decidedly longer and heavier than those of M. crabilli.