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Tregomys shotwelli
Taxonomy
Tregomys shotwelli was named by Wilson (1968) [genotype]. Its type specimen is UMMP V55787, a mandible (sin. with complete dentition), and it is a 3D body fossil. Its type locality is WaKeeny (UM-K6-59), which is in a Clarendonian channel sandstone/claystone in the Ogallala Formation of Kansas. It is the type species of Tregomys.
It was recombined as Copemys shotwelli by Lindsay (1972).
It was recombined as Copemys shotwelli by Lindsay (1972).
Entered
by J. Alroy on 2003-01-23; modified by L. van den Hoek Ostende on 2013-10-27
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1968 | Tregomys shotwelli Wilson p. 119 figs. Textfig. 16 e-g |
| 1968 | Gnomomys saltus Wilson p. 120 figs. fig. 17a-c |
| 1972 | Copemys shotwelli Lindsay |
| 1990 | Tregomys shotwelli Voorhies |
| 1995 | Tregomys shotwelli Sutton and Korth p. 307 |
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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.
†Tregomys shotwelli Wilson 1968
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Invalid names: Gnomomys saltus Wilson 1968 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Wilson 1968 (Gnomomys saltus) | A very small cricetid with simple bulbous and moderately high cusped teeth; anterior bases of metaconid and protoconid opposite
on m1; anteroconid a simple medial cusp with cingula subequal in length; anteroconid joins protoconid by low narrow mure; lower jaw small with masseteric crests terminating as distinct knob high on jaw below anterior root of m2 ; mental foramen relatively large and on the labial side of the diastema. | |
| R. L. Wilson 1968 | A small cricetid with low-cusped, simple molars; m1 with medial anteroconids and subequal anterior cingula; metaconid and protoconid nearly opposite with the posterior side of the latter sloping farther posteriad; m2 sqaurish and realtively large, wider than m1; second lower molar with heavy cingulum on the anterolabial side; masseteric crests low, terminating anteriad at the level of the laterally positioned mental foramen; jaw relatively thin, the depth below m1 greater than the total length of the lower molars; m1 length less than 1.2 mm in well worn specimens; m3 relatively large with greatest transverse width nearly equal to other lower molars; roots on the lower molars long. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Carroll 1988, Lillegraven 1979, Nowak 1999, Hendy et al. 2009 | |||||
Age range: Clarendonian or 12.50000 to 9.40000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Clarendonian | USA (Oklahoma) | Tregomys shotwelli (18463) | |
| Clarendonian | USA (Kansas) | Tregomys shotwelli (type locality: 18450) | |
| Late/Upper Clarendonian | USA (Nebraska) | Tregomys shotwelli (18327) |