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Pseudomesoreodon

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Pseudomesoreodon was named by Schultz and Falkenbach (1950). Its type is Pseudomesoreodon rooneyi.

It was synonymized subjectively with Hypsiops by Lander (1998).

It was assigned to Phenacocoelinae by Schultz and Falkenbach (1950).

Synonymy list
YearName and author
1950Pseudomesoreodon Schultz and Falkenbach p. 128 figs. 8-10, 12-15

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
suborderTylopoda()
superfamilyOreodontoidea
familyMerycoidodontidaeThorpe 1923
subfamilyPhenacocoelinae
genusPseudomesoreodon

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 1950SKULL: Size medium, basal lengths ranging from 237 to 287 mm., widths from 140 to 178 mm. (approximately same size as large ex- amples of Mesoreodon); submesocephalic to brachycephalic; supraoccipital wings widely spread and protruding posteriorly, deeply notched at sides, similar to examples of Phenacocoelus and Hypsiops, but definitely differing from the narrow, posteriorly protruding wings of Mesoreodon; sagittal crest moderately prominent, less so than in Hypsiops; brain case well inflated but depressed posteriorly; frontals from moderately wide to wide; orbits oval in outline with an almost vertical axis, looking mostly outward and upward; squamosal portion of zygomatic arch light, extending posteriorly to above postglenoid process, superior border not very high; malar deep below orbit; infraorbital foramen above P4 ; lacrimal fossa large and deep; premaxillae joined for about the same distance as in examples of Hypsiops, less than in Mesoreodon; occipital condyles medium to large in size; paroccipital process wide laterally at base; bulla large and inflated, with depressed inferior surface (similar to that of Hypsiops, but not to degree noted in examples of Ustatochoerus); postglenoid proc- ess moderately robust, long vertically; posterior palate projects posteriorly beyond M3.
MANDIBLE: Moderately robust; postsymphysis below Pa; inferior border of ramus almost parallel to dental series from symphysis to a point below the last lobe of Ma, with a sharp downward curve extending posteriorly from M3 (more abrupt than in examples of Hypsiops or Mesoreodon); ascending ramus high, higher than in Hypsiops or Mesoreodon; condyles set at less than right angle to axis of dental series with external border of condyle noticeably farther forward than internal border; (characters of mandible based on holotype of ?Pseudomesoreodon boulderensis).
DENTITION: Brachyodont to subhypsodont; series longer than in examples of Hypsiops or Phenacocoelus, approximately same length as small examples of Mesoreodon,· slight crowding of premolars; C/ moderately light; P1-P 3 each with prominent anterior intermediate crest; external styles of superior molars light; P1 moderately heavy; Pa with suggestion of the posterior intermediate crest.
LIMBS: Robust, approximately same length as examples of H. brachymelis and P. stouti; heavier and somewhat shorter than examples of Mesoreodon (from the Gering formation).