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Phenacomys

Mammalia - Rodentia - Cricetidae

Taxonomy
Phenacomys was named by Merriam (1889). It is extant.

It was assigned to Microtinae by Kurten and Anderson (1980); to Cricetidae by Merriam (1889), Repenning et al. (1987) and McKenna and Bell (1997); and to Phenacomyini by Galewski et al. (2006).

Synonyms
Synonymy list
YearName and author
1889Phenacomys Merriam
1975Propliophenacomys Martin p. 105
1980Phenacomys Kurten and Anderson p. 258
1987Phenacomys Repenning et al.
1997Phenacomys McKenna and Bell
1997Propliophenacomys McKenna and Bell
2006Phenacomys Galewski et al.

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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
Synapsida()
Therapsida()
RankNameAuthor
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
EuarchontogliresMurphy et al. 2001
Glires()
orderRodentia
infraorderMyodontaSchaub 1958
superfamilyMuroideaIlliger 1811
familyCricetidaeFischer von Waldheim 1817
familyArvicolinae
tribePhenacomyiniZagorodnyuk 1990
genusPhenacomysMerriam 1889

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
Merriam 1889Brain case subquadrate, with prominent supraorbital ridges bordering a median frontal sulcus; postorbital process of squamosal peglike; interparietal large; zygomatic arches lowest opposite first molar, and expanded vertically into a broad lamina; shelf of palate broadly emarginate posteriorly, without the "step" of Arvicola; ascending ramus of mandible long and slender, slightly higher than coronoid process; root of lower incisor ending at level of alveola of last molar, molars rooted, each having two true divergent roots; crowns large, crowded, with broadly rounded prisms; pattern of upper molar series and arrangement of prisms as in Arvicola (section Pedomys); anterior face of second and third upper molars concave, the anterior loop pyriform, bulging on the inner side, lower molars with line of infolding of enamel near the outer side, last lower molars with line of infolding of enamel near the outer side; last lower molar very large, as broad or nearly as broad anteriorly as posteriorly, and consisting of three elongated transverse loops joined along the outer side of the tooth, without any distinct external loop or triangle.
L. D. Martin 1975 (Propliophenacomys)Medium size microtine with palate and palatal grooves shallow; molars rooted and lacking cement; lingual reentrant angles turned posteriorly and alternating triangles closed.
C. A. Repenning et al. 1987A species of Phenacomys with only two accessory triangles in the anteroconid complex of the first lower molar, the lingual one broadly confluent with the highly variable anteroconid cap and the buccal one preserving a Momomys Kante on the occlusal pattern in all but the least worn specimens (fig. 6); dentine tracts very short. Anteroposterior length of the first lower molars between 2.5 and 2.8mm.