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Gregorymys montanus

Osteichthyes - Rodentia - Entoptychidae

Taxonomy
Gregorymys montanus was named by Korth and Kron (2020). Its type specimen is UCM 29738, a mandible (right dentary with i1, p4– m1), and it is a 3D body fossil. Its type locality is Blue Ash Local Fauna, which is in a Whitneyan terrestrial horizon in South Dakota.

Entered
by J. Marcot on 2026-05-08; modified by J. Marcot on 2026-05-08

Synonymy list
YearName and author
2020Gregorymys montanus Korth and Kron pp. 341 - 342 figs. Figs. 23–24; Table 18

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
RankNameAuthor
infraorderCynodontia()
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentia
familyEntoptychidae(Miller and Gidley 1918)
genusGregorymysWood 1936
speciesmontanus

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.

†Gregorymys montanus Korth and Kron 2020
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Diagnosis
ReferenceDiagnosis
W. W. Korth and D. G. Kron 2020Similar in size to G. formosus, larger than Gregorymys larsoni and G. riograndensis Stevens, 1977; minute lophid on anterior side of metaconid of p4, produc- ing persistent groove on anterior slope; incisors asulcate.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingo
Diet: herbivoreo
Reproduction: viviparoussubc
Created: 2005-08-26 14:04:46
Modified: 2005-08-26 16:04:46
Source: o = order, subc = subclass, c = class, subp = subphylum
References: Ji et al. 2002, Carroll 1988, Hendy et al. 2009, Nowak 1999, Lillegraven 1979

Age range: Whitneyan or 31.80000 to 29.50000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Whitneyan31.8 - 29.5USA (South Dakota) Gregorymys montanus (type locality: 278678)