Euryzygomatomyinae
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| Euryzygomatomyinae | |
|---|---|
 | |
| Trinomys, a member of the subfamily Euryzygomatomyinae. | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Rodentia |
| Parvorder: | Caviomorpha |
| Superfamily: | Octodontoidea |
| Family: | Echimyidae |
| Subfamily: | Euryzygomatomyinae Fabre et al. 2017 [1] |
| Genera | |
Euryzygomatinae is a subfamily of rodents, proposed in 2017, and containing three extant genera of spiny Echimyidae: Clyomys, Euryzygomatomys, and Trinomys.[1]
Members of this echimyid subfamily all share an origin in the eastern part of Brazil, close to the Atlantic Forest.
The teeth of Euryzygomatomyines are characterized by several features:
- elongate lower and upper incisor roots;
- five lophids on the lower deciduous premolars 4;
- either four lophids in Trinomys, or three lophids in Clyomys and Euryzygomatomys, on the lower molars 1;
- well-connected lophs on the cheek teeth;
- three molar roots anchoring the upper molars.
Their zygomatic arch is reduced with a slightly concave dorsal margin, and the jugal bone is ventrally expanded with much reduced, scarcely salient inferior process.[1]