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Spermophilus wilsoni
Taxonomy
Citellus (Otospermophilus) wilsoni was named by Shotwell (1956). Its type specimen is UOMNH F-4097, a mandible (a complete right lower jaw with P4-M3; incisor missing), and it is a 3D body fossil. Its type locality is McKay Reservoir, which is in a Hemphillian pond sandstone in the McKay Formation of Oregon.
It was recombined as Otospermophilus wilsoni by Barnosky (1986); it was recombined as Spermophilus wilsoni by Shotwell (1968), Shotwell (1970), Wilson and Reeder (1993), Korth (1994).
It was recombined as Otospermophilus wilsoni by Barnosky (1986); it was recombined as Spermophilus wilsoni by Shotwell (1968), Shotwell (1970), Wilson and Reeder (1993), Korth (1994).
Sister species lacking formal opinion data
Entered
by J. Marcot on 2026-05-01; modified by J. Marcot on 2026-05-29
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Citellus (Otospermophilus) wilsoni Shotwell p. 728 figs. Figure 5 |
| 1963 | Citellus (Otospermophilus) wilsoni Black p. 208 figs. Plate 21 |
| 1968 | Spermophilus wilsoni Shotwell |
| 1970 | Spermophilus wilsoni Shotwell p. 26 |
| 1986 | Otospermophilus wilsoni Barnosky |
| 1993 | Spermophilus wilsoni Wilson and Reeder |
| 1994 | Spermophilus wilsoni Korth |
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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.
†Spermophilus wilsoni Shotwell 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. A. Shotwell 1956 | The differences in height of trigonid
and talonid and the length of the tooth row are similar to the living Citellus beechyi. All lower- dentition teeth are at least as wide as long. Metalo- phid becomes progressively shorter from M1-M3. Upper P4-M3 are subquadrate in shape. Lophs are nearly parallel on the uppers. Metaloph does not connect to the protocone until late wear. | |
| C. C. Black 1963 | Near size of Citellus (O.) shotwelli; molars rhomboidal in outline, not as greatly compressed anteroposteriorly as in C. (O.) shotwelli; metaloph incomplete, metaconule large on P4-M2; entoconid completely incorporated within posterolophid; metalophid progressively shorter from Mi-M3, leaving trigonid basin open into talonid basin on M2-M3 ; ectolophids high, set well in from buccal margins on P4-M3. |
Measurements
No measurements are available
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| Source: g = genus, f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Fernández et al. 2000, Ji et al. 2002, Lillegraven 1979, Carroll 1988, Hendy et al. 2009, Nowak 1991 | |||||
Age range: Hemphillian or 9.40000 to 4.70000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hemphillian | USA (Washington) | Spermophilus wilsoni (232055) | |
| Hemphillian | USA (Oregon) | Citellus wilsoni (18939 type locality: 18970) Spermophilus wilsoni (18807 18935 18936) |