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Downsimus chadwicki

Mammalia - Rodentia - Allomyidae

Taxonomy
Downsimus chadwicki was named by Macdonald (1970) [genotype]. Its type locality is Sharps (SDSM V-544), which is in a Geringian terrestrial horizon in the Sharps Formation of South Dakota. It is the type species of Downsimus.

Synonyms
Synonymy list
YearName and author
1970Allomys sharpi Macdonald
1970Downsimus chadwicki Macdonald
1983Downsimus sharpi Rensberger

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentiaBowdich 1821
familyAllomyidaeMarsh 1877
genusDownsimus
specieschadwicki

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.

†Downsimus chadwicki Macdonald 1970
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Invalid names: Allomys sharpi Macdonald 1970 [synonym]
Diagnosis
No diagnoses are available
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: Hendy et al. 2009, Carroll 1988, Nowak 1999, Ji et al. 2002, Lillegraven 1979

Age range: base of the early Early Arikareean to the top of the Monroecreekian or 29.50000 to 24.80000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Geringian30.8 - 26.3USA (Nebraska) Downsimus chadwicki (17544 17709)
Geringian30.8 - 26.3USA (South Dakota) Allomys sharpi (17637) Downsimus chadwicki (type locality: 17644)
early Early Arikareean29.5 - 18.5USA (Nebraska) Downsimus chadwicki (156729)
Monroecreekian26.3 - 24.8Canada (Saskatchewan) Allomys sp. (17526)