The stiff-spine spiny-rat (Proechimys echinothrix) or Tefe spiny rat, is a spiny rat species[2] found in Brazil and Colombia.

Morphological characters and mitochondrial cytochrome b DNA sequences showed that P. echinothrix represents one independent evolutionary lineage within the genus Proechimys, without clear phylogenetic affinity for any of the 6 major groups of species.

[3][2][4][5] Hoplomys gymnurus Proechimys canicollis (Colombian spiny rat) Proechimys decumanus (Pacific spiny rat) Proechimys echinothrix (Stiff-spine spiny rat) Proechimys simonsi (Simon's spiny rat) Proechimys kulinae (Kulina spiny rat) Proechimys gardneri (Gardner's spiny rat) Proechimys pattoni (Patton's spiny rat) Proechimys gorgonae Proechimys oconnelli (O'Connell's spiny rat) Proechimys semispinosus (Tome's spiny rat) Proechimys boimensis Proechimys guyannensis (Guyenne spiny rat) Proechimys oris Proechimys roberti (Roberto's spiny rat) Proechimys cuvieri (Cuvier's spiny rat) Proechimys brevicauda (Short-tailed spiny rat) Proechimys gularis Proechimys longicaudatus (Long-tailed spiny rat) Proechimys amphichoricus Proechimys goeldii (Goeldi's spiny rat) Proechimys hyleae Proechimys quadruplicatus (Napo spiny rat) Proechimys steerei (Steere's spiny rat) Proechimys chrysaeolus (Boyacá spiny rat) Proechimys guairae (Guaira spiny rat) Proechimys hoplomyoides (Guyanan spiny rat) Proechimys magdalenae (Magdalena spiny rat) Proechimys mincae (Minca spiny rat) Proechimys poliopus (Gray-footed spiny rat) Proechimys trinitatus (Trinidad spiny rat) Proechimys urichi (Sucre spiny rat)

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