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Mioheteromys amplissimus

Osteichthyes - Rodentia - Heteromyidae

Taxonomy
Mioheteromys amplissimus was named by Korth (1997) [genotype]. Its type specimen is UCMP 37134, a partial skull (partial skull with all cheek teeth and associated right mandible with all teeth), and it is a 3D body fossil. Its type locality is Nenzel Quarry, which is in a Barstovian terrestrial horizon in the Valentine Formation of Nebraska. It is the type species of Mioheteromys.

Entered
by J. Alroy on 2003-01-23; modified by J. Marcot on 2026-05-19

Synonymy list
YearName and author
1997Mioheteromys amplissimus Korth p. 41 figs. Figure 3,4; Table 6
2020Mioheteromys amplissimus Korth and Kron p. 330 figs. Figs. 17F–G

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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()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentia
infraorderCastorimorpha
superfamilyGeomyoideaBonaparte 1845
familyHeteromyidaeGray 1868
subfamilyMioheteromyinae
genusMioheteromys
speciesamplissimus

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.

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Diagnosis
ReferenceDiagnosis
W. W. Korth 1997Differs from all other species of the genus in its larger size, cheek teeth slightly lower crowned (Table 2), P4 wider (buccolingually) than M1, and paracone variably present on P4 (absent in other species); central basin of p4 not as well developed as in M. agrarius; anterostylid present on half of the known specimens of p4 (more frequently than in M. arcarius, less frequently than in M. agrarius) and isolated from metaconid when present (fused to metaconid in M. agrarius).
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: granivoref
Diet 2: browserf
Reproduction: viviparoussubc
Created: 2005-06-08 10:11:09
Modified: 2005-08-26 13:09:37
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Ji et al. 2002, Nowak 1991, Hendy et al. 2009, Carroll 1988, Lillegraven 1979

Age range: base of the Barstovian to the top of the Clarendonian or 16.30000 to 9.40000 Ma

Collections (8 total)


Time interval Ma Country or state Original ID and collection number
Barstovian16.3 - 12.5USA (Wyoming) Diprionomys agrarius (18868 18990)
Barstovian16.3 - 12.5USA (Nebraska) Diprionomys agrarius (18284) Mioheteromys amplissimus (18031 type locality: 18281) Oregonomys agrarius (18027)
Clarendonian12.5 - 9.4USA (Nebraska) Mioheteromys amplissimus (18324 188779)