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Simimys simplex

Osteichthyes - Rodentia - Simimyidae

Taxonomy
Eumysops simplex was named by Wilson (1935) ["genotype"]. Its type specimen is LACM (CIT) 1759, a mandible (leeft ramus with m1-m3), and it is a 3D body fossil. Its type locality is Pearson Ranch (Bed CS20), which is in a Duchesnean terrestrial horizon in the Sespe Formation of California. It is the type species of Simimys, Eumysops.

It was recombined as Simimys simplex by Wilson (1935), Wood (1980) and Kelly (1992).

Entered
by J. Alroy on 2003-01-23; modified by J. Marcot on 2026-05-02

Synonyms
Synonymy list
YearName and author
1935Simimys simplex Wilson
1935Simimys vetus Wilson
1935Eumysops simplex Wilson p. 26 figs. Figure 1
1935Eumysops vetus Wilson p. 28
1980Simimys simplex Wood
1992Simimys simplex Kelly

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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()
RankNameAuthor
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentia
infraorderMyodontaSchaub 1958
superfamilyDipodoideaFischer 1817
familySimimyidaeWood 1980
genusSimimysWilson 1935
speciessimplex(Wilson 1935)

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.

†Simimys simplex Wilson 1935
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Invalid names: Eumysops vetus Wilson 1935 [synonym]
Diagnosis
ReferenceDiagnosis
R. W. Wilson 1935MetastylidsomewhatlessdevelopedonMl than inEumysopsvetus. MetastylidnotpresentonM2. Connectionbetween hypostylid and protoconid generally less well developed than in E. vetus, sometimeslacking.
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: Nowak 1999, Hendy et al. 2009, Ji et al. 2002, Carroll 1988, Lillegraven 1979

Age range: base of the Late/Upper Uintan to the top of the Duchesnean or 45.90000 to 37.00000 Ma

Collections (33 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Uintan45.9 - 39.7USA (California) Simimys simplex (16694 16695 16696 16763 16764 16765 16767 16768 16770 16771 16773 16775 16776 16777 16778)
Late/Upper Uintan45.9 - 39.7USA (California) Simimys simplex (16585 16766 16780 167831)
Uintan45.9 - 39.7USA (California) Eumysops vetus (16790) Simimys simplex (16530 16603 16615 16629 16786 16789 16791) Simimys sp. (16590)
Late/Upper Uintan - Duchesnean45.9 - 37.0USA (California) Simimys simplex (16529)
Uintan - Duchesnean45.9 - 37.0USA (California) Simimys simplex (16533)
Duchesnean39.7 - 37.0USA (California) Eumysops simplex (type locality: 16810) Simimys simplex (16806 16813)