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Phenacocoelus typus

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Phenacocoelus typus was named by Peterson (1907) [genotype]. Its type specimen is CM 1263, a partial skeleton (the greater portion of a skeleton), and it is a 3D body fossil. Its type locality is Monroe Creek (Type), which is in a Monroecreekian terrestrial horizon in the Monroe Creek Formation of Nebraska. It is the type species of Phenacocoelus.

Synonymy list
YearName and author
1907Phenacocoelus typus Peterson
1950Phenacocoelus typus Schultz and Falkenbach p. 111 figs. 1-3, 11, 13, 15
1980Phenacocoelus typus MacFadden p. 97
2007Phenacocoelus typus Stevens and Stevens p. 164

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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
speciestypus

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: Smaller than those of other species of genus; frontals rather flat with depressed area in supraorbital vacuity region; nasals not noticeably retracted; anterior nasal-maxilla contact in area above P1, oblong supraorbital vacuity same position as elongated slot-like depression in P. kayi and the supraorbital foramen in P. stouti; zygomatic arch light, with slight inward curve below posterior border of orbit (more U-shaped from side view than in P. kayi or P. stouti, more like Hypsiops brachymelis petersoni in this respect); posterior border of zygomatic arch above anterior border of postglenoid process, not extending so far posteriorly as in other species of genus; infraorbital forarnen above middle of P 3 ; facial vacuity present; bulla more inflated in P. kayi and P. stouti; palate more oval in outline than other known forms of genus; postglenoid process moderately heavy but lighter and with steeper incline on external border than in other two species of genus.
MANDIBLE: Smaller than those of other species of genus ; ramus deep for size of skull (deeper than in examples of P. kayi and P. stouti); inferior border with less suggestion of downward curve below and posterior to Ma than in latter species.
DENTITION: Series shorter than in other species of genus; C/ and P1 moderately large ...
crowded than in other two species but slightly overlapping and nearly parallel to the alveolar border; slight suggestion of posterior intermediate crest on P2 (Pa worn in available material, and posterior intermediate crest not present).
LIMBS: Short and comparatively robust; considerably smaller than examples of P. kayi and Merychyus siouxensis.