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Phenacocoelus kayi

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Phenacocoelus kayi was named by Schultz and Falkenbach (1950). Its type specimen is F:AM 33660A, a partial skull (Skull with I1-M3 and partial mandible with i1-i3 alv. and /c-m3), and it is a 3D body fossil. Its type locality is Southeast of Lusk, which is in a Harrisonian terrestrial horizon in the Marsland Formation of Wyoming.

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

Synonymy list
YearName and author
1950Phenacocoelus kayi Schultz and Falkenbach p. 106 figs. 1-3,11,13-15

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

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:Intermediate in size between P. typus and P. stouti; frontals slightly rounded laterally; nasals retracted anteriorly to a point above posterior portion of P1, with greater retraction than in examples of P. typus; anterior nasal-maxilla contact above the posterior portion of P2; supraorbital foramen at posterior end of a deep, narrow, elongated, slot-like depression (not an oblong vacuity as in P. typus or a round foramen as in P. stouti'), with suggestion of a groove extending forward and downward from it to
facial vacuity; zygomatic arch with a gradual rise posteriorly, extending to a point above posterior border of postglenoid process; in- fraorbital foramen above posterior portion of P 8 ; facial vacuity 2 ; bulla with inferior surface more depressed towards basioccipital than in P. typus; postglenoid process moderately heavy with sloping external border.
MANDIBLE:Intermediate in size between examples of P. typus and P. stouti; approximately equal in size to examples of Hypsiops luskensis.
DENTITION: Superior and inferior series intermediate in over-all length between P. typus and P. stouti, approximately equal in size to examples of H. luskensis; C/ and P1 large; axis of PLP 3 parallel to alveolar border; P2 and Pa set at slight angle to alveolar border; P2 with weak posterior intermediate crest; Paand P, each with moderately prominent posterior intermediate crest.
LIMBS:Decidely longer than examples of P. typus; lighter, but approximately same length as examples of P. stouti.