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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Gregorymys riograndensis
Taxonomy
Gregorymys riograndensis was named by Stevens (1977). Its type specimen is TMM 40635-89, a partial skull (ariterior part of skull with associated lower jaws), and it is a 3D body fossil. Its type locality is Castolon (TMM 40635), which is in a Harrisonian terrestrial horizon in the Delaho Formation of Texas.
Synonymy list
| Year | Name and author |
|---|---|
| 1977 | Gregorymys riograndensis Stevens p. 25 figs. 6A-B; 7A-G; 8A-G |
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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.
†Gregorymys riograndensis Stevens 1977
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. S. Stevens 1977 | Differs from Gregorymys douglassi by slightly smaller size, lack of well defined upper incisor sulcus, and skull with a lower rostral vault |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Ji et al. 2002, Hendy et al. 2009, Carroll 1988, Nowak 1999 | |||||
Age range: Harrisonian or 24.80000 to 18.50000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Harrisonian | USA (Texas) | Gregorymys riograndensis (17836) Gregorymys sp. (type locality: 17768) |