Atlantic spiny rat
The Atlantic spiny rats are all found in the genus Trinomys. They are a group of South American spiny-rats in the family Echimyidae.
Extant species of ''Trinomys''
Based on Natureserve.| Trinomys albispinus | White-spined Atlantic spiny rat |
| Trinomys dimidiatus | Soft-spined Atlantic spiny rat |
| Trinomys eliasi | Elias's Atlantic spiny rat |
| Trinomys gratiosus | Gracile Atlantic spiny rat |
| Trinomys iheringi | Ihering's Atlantic spiny rat |
| Trinomys mirapitanga | Dark-caped Atlantic spiny rat |
| Trinomys moojeni | Moojen's Atlantic spiny rat |
| Trinomys myosuros | Mouse-tailed Atlantic spiny rat |
| Trinomys paratus | Spiked Atlantic spiny rat |
| Trinomys setosus | Hairy Atlantic spiny rat |
| Trinomys yonenagae | Yonenaga's Atlantic spiny rat |
The species of spiny rats in the genus Trinomys are apparently all Brazilian. In particular many of them are endemic to the Atlantic Forest of southeastern Brazil. Not much is known for certain about their ranges however, which still are being investigated, with frequent extensions to the recorded distributions of several species in various ecological classes of forest and dry land. They do not however appear to occur at high altitudes, and several of their ranges appear to be parapatric.
Phylogeny
Genus level
Trinomys is the sister genus to the fossorial genera Clyomys and Euryzygomatomys.In turn, these three genera — forming the clade of Euryzygomatomyinae — share phylogenetic affinities with a clade containing Carterodon and members of the family Capromyidae.