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Phenacocoelus stouti

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Phenacocoelus stouti was named by Schultz and Falkenbach (1950). Its type specimen is F:AM 44839, a skull (Skull with I1-I2 alv. and I3-M3), and it is a 3D body fossil. Its type locality is Guernsey, which is in a Harrisonian terrestrial horizon in the Marsland Formation of Wyoming.

It was synonymized subjectively with Merycoides longiceps by Lander (1998); it was recombined as Merycoides stouti by Stevens and Stevens (2007).

Synonymy list
YearName and author
1950Phenacocoelus stouti Schultz and Falkenbach p. 107 figs. 1-3, 11, 13-15
2007Merycoides stouti Stevens and Stevens p. 163

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
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
subfamilyTicholeptinae
genusPhenacocoelus
speciesstouti

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: Largest known form of the genus; frontals rounded laterally; nasal retracted anteriorly to a point above anterior portion ofP1; anterior nasal-maxillacontact inregion above P2;typical round supraorbital foramen present (not an oblong vacuity as in P. typus or elongated slot-like depression as in P. kayi), with prominent groove extending forward and downward on side of face to ap- proximately the anterior border of large lacrimal fossa; zygomatic arch moderately heavy, with gradual rise posteriorly, extending to and above posterior border of post-glenoid process (similar to arch of P. kayi, not U-shaped in outline as in P. typus); malar deeper than in other species of genus; infraorbital foramen above P4 , enlarged; bulla similar to that of P. kayi, with inferior surface more depressed towards basioccipital than in P. typus; postglenoid process robust, wide transversely.
MANDIBLE: Largest of genus; similar in shape to that of P. kayi; ramus shallower than examples of P. typus; inferior border with more downward curve below M3 than in other species of genus.
DENTITION: Superior and inferior series longer and more robust than in other species of Phenacocoelus; C/ and P1moderately large and heavy; premolars not crowded, tendency to slight diastema between P1 and P2 ; p1 usually set at slight angle to alveolar border; Pr-P3 each set at slight angle to alveolar border; weak posterior intermediate crest developed on P2.
LIMBS:Approximately same length as examples of P. kayi; considerably longer than those of P. typus; more robust than in either of these two species.