Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections

Calomys (Bensonomys) arizonae

Mammalia - Rodentia - Cricetidae

Taxonomy
Eligmodontia arizonae was named by Gidley (1922). Its type specimen is USNM 10503, a mandible (Greater portion of a left lower jaw containing the complete dentition), and it is a 3D body fossil.

It was recombined as Calomys (Bensonomys) arizonae by Baskin (1978); it was recombined as Bensonomys arizonae by Gazin (1942), Hibbard (1950), Kurten and Anderson (1980) and Martin et al. (2002).

Sister species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1922Eligmodontia arizonae Gidley p. 124 figs. Pl. 36, fig. 15
1942Bensonomys arizonae Gazin
1950Bensonomys arizonae Hibbard
1978Calomys (Bensonomys) arizonae Baskin
1980Bensonomys arizonae Kurten and Anderson p. 248
2002Bensonomys arizonae Martin et al.

Is something missing? Join the Paleobiology Database and enter the data

RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
RankNameAuthor
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
EuarchontogliresMurphy et al. 2001
Glires()
orderRodentia
infraorderMyodontaSchaub 1958
superfamilyMuroideaIlliger 1811
familyCricetidaeFischer von Waldheim 1817
subfamilySigmodontinaeWagner 1843
genusCalomys
subgenusBensonomys
speciesarizonae()

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
J. W. Gidley 1922Description.-Length of cheek-tooth series 3.6 millimeters; about the size of the living species E. morgani, but may be distinguished from it by its relatively greater depth of jaws, its decidedly shorter symphysis, and the less reduced condition of the last molar.The anterior lobe of the first cheek tooth is distinctly notched by an anterior median reentrant angle, as is usual in Peromyscus, whereas
in the living species of Eligmodontia this lobe is usually evenly convex in front. The fossil species from Arizona, however, is readily
distinguished from Peromyscus by the characters which ally it to Eligmodontia, namely, by the form and position of the masseteric
ridge, which extends forward to the extreme anterior border of the cheek-tooth series; by the form and situation of the capsular process
for the reception of the base of the incisor,which is placed high upon the ascending ramus and is marked by a decided sulcus between it
and the coronoid; and by the form of the last cheek tooth, which in species of Eligmodontia is more reduced than in Peromyscus.