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Ustatochoerus

Mammalia - Merycoidodontidae

Synonymy list
YearName and author
1941Ustatochoerus Schultz and Falkenbach p. 10
2007Ustatochoerus Stevens and Stevens p. 166
2019Ustatochoerus May
2023Ustatochoerus Stevens et al. p. 117

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
subclassSynapsida
Therapsida()
infraorderCynodontia()
RankNameAuthor
Mammaliamorpha
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Scrotifera
Euungulata
Artiodactylamorpha
Artiodactyla()
familyMerycoidodontidae
subfamilyUstatochoerinae
genusUstatochoerus

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. †Ustatochoerus Schultz and Falkenbach 1941
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Ustatochoerus leptoscelos Stevens et al. 1969
Ustatochoerus major Leidy 1858
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Invalid names: Merychyus (Metoreodon) profectus Matthew and Cook 1909 [synonym], Merychyus major major Leidy 1859 [invalid subgroup], Ustatochoerus major texanus Schultz and Falkenbach 1941 [invalid subgroup], Ustatochoerus profectus espanolensis Schultz and Falkenbach 1941 [invalid subgroup], Ustatochoerus profectus nevadaensis Schultz and Falkenbach 1968 [invalid subgroup], Ustatochoerus profectus studeri Schultz and Falkenbach 1941 [invalid subgroup], Ustatochoerus skinneri Schultz and Falkenbach 1941 [synonym], Ustatochoerus skinneri santacruzensis Schultz and Falkenbach 1941 [invalid subgroup]
Ustatochoerus medius Leidy 1858
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Ustatochoerus medius mohavensis Schultz and Falkenbach 1941
Invalid names: Merychyus medius novomexicanus Frick 1929 [invalid subgroup], Merycochoerus coenopus Scott 1890 [synonym], Merycochoerus compressidens Douglass 1901 [synonym]
Ustatochoerus tedfordi Stevens et al. 2023
Invalid names: Ustatochoerus californicus raki Schultz and Falkenbach 1941 [invalid subgroup]
Diagnosis
ReferenceDiagnosis
C. B. Schultz and C. H. Falkenbach 1941SKULL.-Medium to large size, ranging in length from approximately 220 mm. to 325 mm.; brachycephalic; occipital region fan-shaped (somewhat simi- lar to Brachycrus Matthew); sagittal crest prominent; brain case moderately inflated; zygomatic arch moderately light for size of skull; orbits large (com- pared to Brachycrus and M erycochoerus), looking forward and upward; pre- lacrimal pit moderately deep; prelacrimal vacuity usually present; infraorbital foramina above region of P4 and M1; slight to moderate retraction of nasals (not as great as in Brachycrus and M erycochoerus); premaxillae fused for short distance; paroccipital process long and wide at base, forming the lower part of the fan-shaped occipital region; postglenoid process narrow anteroposteriorly but prominent; bullre divided into two portions 2 with inflated area between the paroccipital and postglenoid processes and deflated area anterior to the par- occipital process.
MANDIBLE.-Shallow for size of the skull; inferior border of ram us almost parallel to the tooth series, with a slight downward curve below Ma.
DENTITION.-Moderately hypsodont; I~very prominent, at least twice the size of It premolars complicated; superior premolars with a definite cusp on the anterior intermediate crest, and often with a small cusp on the center of the posterior crescent; internal and external cingula usually well developed on pre- molars; external styles of molars prominent; inferior premolars crowded, slightly grooved externally, with cusps situated internally at center of the anterior crests; M 3 with large heel.
LIMBs.-Moderately heavy (compared to those of most genera of oreodonts).
M. S. Stevens et al. 2023Teeth higher crowned than in Ticholeptus or Mediochoerus, with more prominent shelf-like labial premolar cingula. Tip of nasals retracted above P1-P2, with a relatively deep narial notch. Infraorbital foramen above P4. Upper border of maxilla rises gradually to nasals. Lower border of ramus straight to slightly curved. Moderately hypsodont but becoming more hypsodont with successive species. Facial vacuity small and decreasing in size with later species. Occiput broad and becoming broader in later species. Premolars with complex patterns. Robust limbs. (Modified from Schultz and Falkenbach, 1941, and Stevens and Stevens, 2007).