It is a small caviomorph rodent locally known as "Rabo-de-facho" (Portuguese) due to its retiform hairs and long penciled tail. The maximum head and body length of this species is 177mm.
These species is threatened by habitat loss and restricted geographical distribution. These rodents have a nocturnal habits, using hollow logs, and holes in the ground as shelters during the day. Their diet consists of seeds, fruits, fungi, leaves, and insects.
Brito, D., & de Souza Lima Figueiredo, M. (2003). Minimum viable population and conservation status of the Atlantic Forest spiny rat Trinomys eliasi. Biological Conservation, 113(1), 153–158. https://doi.org/10.1016/S0006-3207(02)00344-0
Luchesi, L. C., Ruiz Cantano, L. M., Takata, J. T., & Monticelli, P. F. (2019). Trinomys yonenagae (Rodentia: Echimyidae). Mammalian Species, 51(971), 1–10. https://doi.org/10.1093/mspecies/sez001
Attias, N. do E. do R. de J. I. de B. R. A. D. de E., Raíces, D. S. L. (Universidade do E. do R. de J. I. de B. R. A. D. de E., Pessoa, F. S. (Universidade do E. do R. de J. I. de B. R. A. D. de E., Albuquerque, H. do E. do R. de J. I. de B. R. A. D. de E., Jordão-Nogueira, T. F. do R. de J. P. de P. em E., Modesto, T. C. (Universidade do E. do R. de J. I. de B. R. A. D. de E., & Bergallo, H. de G. (Universidade do E. do R. de J. I. de B. R. A. D. de E. (2009). Potential distribution and new records of Trinomys species (Rodentia: Echimyidae) in the state of Rio de Janeiro. Zoologia (Curitiba, Brazil), 26(2), 305–315. https://doi.org/10.1590/S1984-46702009000200013
LARA, M. C., & PATTON, J. L. (2000). Evolutionary diversification of spiny rats (genus Trinomys, Rodentia: Echimyidae) in the Atlantic Forest of Brazil. Zoological Journal of the Linnean Society, 130(4), 661–686. https://doi.org/10.1111/j.1096-3642.2000.tb02205.x