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Calomys (Bensonomys) arizonae
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).
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
Synonymy list
| Year | Name and author |
|---|---|
| 1922 | Eligmodontia arizonae Gidley p. 124 figs. Pl. 36, fig. 15 |
| 1942 | Bensonomys arizonae Gazin |
| 1950 | Bensonomys arizonae Hibbard |
| 1978 | Calomys (Bensonomys) arizonae Baskin |
| 1980 | Bensonomys arizonae Kurten and Anderson p. 248 |
| 2002 | Bensonomys arizonae Martin et al. |
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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.
†Calomys (Bensonomys) arizonae Gidley 1922
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Gidley 1922 | Description.-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. |