Thomomyini
| Tribe Thomomyini | |
|---|---|
| Taxonomic classification | |
| Order: | Rodentia |
| Suborder: | Supramyomorpha |
| Infraorder: | Castorimorphi |
| Superfamily: | Geomyoidea |
| Family: | Geomyidae |
| Subfamily: | Geomyinae |
Available taxon pages
The following genera are available on WhiskerWiki for this tribe:
- Genus: Megascapheus
- Genus: Thomomys
- Subgenus: No information
Morphological differences between Megascapheus in relation to Thomomys
From Álvarez-Castañeda and Segura-Trujillo (2025): "Morphological difference between Megascapheus in relation to Thomomys are: the upper incisors procumbent and their root between the fourth upper premolars and the first upper molars vs upper incisors not procumbent and their root above the fourth upper premolars; sphenoidal fissure open vs closed (except for some specimens of T. clusius); angular process continuous, with a well-developed flange along the ventral ramus side vs not continuous, with a weakly developed flange along the ventral ramus side; rostrum heavy vs rostrum slender; base of the first lower premolars inclined anteriorly vs nearly perpendicular to the occlusal surface of the toothrow; infraorbital canal openings anterior to the incisive foramina vs directly above or slightly posterior to the incisive foramina; anterior enamel plate of the first lower premolars not recurved vs recurved, frequently forming a shallow re-entrant angle; anterior enamel plate of the first lower premolars narrow and broadly separated from the lateral enamel plate on the lingual side, vs only slightly separated from the posterior enamel plate (rarely continuous), with the lateral enamel plate on the lingual side; chromosome number of living forms from 74 to 82 vs from 40 to 60 (Nelson and Goldman 1934; Russell 1968; Álvarez-Castañeda 2024).
References
Álvarez-Castañeda ST. 2024. Mammals of North America-Systematics and Taxonomy. Volume 2. Springer.
Álvarez-Castañeda ST, Segura-Trujillo CA. 2025. Genus-level review of pocket gophers in the family Geomyidae. Therya 16(1): 41-75. http://scielo.org.mx/scielo.php?pid=S2007-33642025000100041&script=sci_arttext
Nelson EW , Goldman EA. 1934. Revision of the pocket gophers of the genus Cratogeomys. Proceedings of the Biological Society of Washington 47:135-154.
Russell RJ. 1968. Evolution and classification of the pocket gophers of the subfamily Geomyinae. University of Kansas Publications, Museum of Natural History 16:473-579.