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Miniochoerus chadronensis

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Stenopsochoerus (Pseudostenopsochoerus) chadronensis was named by Schultz and Falkenbach (1956). Its type specimen is F:AM 45489, a partial skeleton (Skull with I1-M3, mandible with i1-m3 (i2 rt.), partial scapula, 2 partial radii, 2 partial ulnae, and manus), and it is a 3D body fossil. Its type locality is Southwestern End of Seamen Hills (Chadronian), which is in a Chadronian terrestrial horizon in Wyoming. It is the type species of Stenopsochoerus (Pseudostenopsochoerus).

It was recombined as Oreonetes chadronensis by Lander (1998); it was recombined as Miniochoerus chadronensis by Stevens and Stevens (1996) and Stevens and Stevens (2007).

Synonyms
Synonymy list
YearName and author
1956Stenopsochoerus reideri Schultz and Falkenbach
1956Stenopsochoerus (Pseudostenopsochoerus) chadronensis Schultz and Falkenbach p. 445 figs. 8 - 11
1956Stenopsochoerus (Pseudostenopsochoerus) douglasensis Schultz and Falkenbach p. 447 figs. 8 - 11
1956Parastenopsochoerus conversensis Schultz and Falkenbach p. 451 figs. 6 - 7
1996Miniochoerus chadronensis Stevens and Stevens
1998Oreonetes chadronensis Lander
2007Miniochoerus chadronensis Stevens and Stevens p. 158

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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
subfamilyMiniochoerinae
genusMiniochoerus
specieschadronensis()

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 1956 (Parastenopsochoerus conversensis)SKULL: Small size; see generic characters.
MANDIBLE:Unknown.
DENTITION: See generic characters.
LIMBS: Unknown.
C. B. Schultz and C. H. Falkenbach 1956SKULL: Small size; smaller than holotype of S. (P.) reideri; mesocephalic; sagittal crest prominent; brain case wide and expanded, more inflated than in S. (P.) douglasensis; postorbital constriction wider than in S. (P.) douglasensis; exoccipital with prominent elongated groove above base of paroccipital process; frontals less convex laterally at external border than in examples of S. (P.) reideri, resulting in less depth between superior border of orbit and superior plane of frontal ; nasals moderately narrow and light, tendency to be lighter than in examples of S. (P.) douglasensis, anterior nasal-maxilla contact in area above P1 ; zygomatic arch with less posterior rise to inferior border than in latter species ; malar moderately deep below orbit, deeper than in average examples of S. sternbergi, lacrimal fossa moderately deep, larger than in S. (P.) douglasensis; paroccipital process light, tapering rapidly to inferior border, lighter than in examples of S. (P.) douglasensis; posterior border of palate projecting posteriorly to center of last lobe of M8, less posterior extension than in S. (P.) douglasensis and S. (P.) reideri.
MANDIBLE: Condyle larger than in examples of S. sternbergi, smaller than that of S. (P.) reideri.
DENTITION: Length of series of holotype shorter than that of holotype of S. (P.) douglasensis, but, on average, examples approximately equal, smaller than in holotype of S. (P.) reideri,· premolars crowded; P2-P 8 and P1-P 3 set at slight angle to alveolar border, less angle than in holotype of S. (P.) reideri.
LIMBS: Approximately equal to those of S. (P.) douglasensis,larger than in S. sternbergi.
C. B. Schultz and C. H. Falkenbach 1956 (Stenopsochoerus (Pseudostenopsochoerus) douglasensis)SKULL: Within size range of examples of S. (P.) chadronensis; exoccipital with small foramen above base of paroccipital process; brain case narrower and less inflated than in S. (P.) chadronensis,· postorbital constriction narrower than in S. (P.) chadronensis;frontals similar to those of latter species, less convex laterally than in holotype of S. (P.) reideri; nasals with tendency to be more robust than those of S. (P.) chadronensis; anterior nasal-maxilla contact above and just posterior to C/ ; zygomatic arch with less posterior rise than in holotype of S. (P.) reideri; malar moderately light below orbit ; lacrimal fossa as deep as but slightly larger than in examples of S. (P.) chadronensis; paroccipital process more robust than those of latter species; posterior palate projecting posteriorly for short distance beyond M8•
MANDIBLE: Similar chadronensis.
DENTITION: Length than in examples of S. (P.) chadronensis; tendency for premolars to be more crowded than those of latter species.
LIMBS: Approximately equal to those of S. (P.) chadronensis, somewhat lighter than in S. berardae, and larger than those of S. sternbergi.