Order Rodentia - Family Echimyidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 1575 1592 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Proechimys simonsi Thomas 1900 Proechimys simonsi Thomas 1900 , Ann. Mag. Nat. Hist., ser. 7, 6: 300 . Type Locality: Peru , Dept. Junín , Río Perené ( 240 m ). Vernacular Names: Simon's Spiny-rat . Synonyms: Proechimys hendeei Thomas 1926 ; Proechimys nigrofulvus Osgood 1944 . Distribution: Western Amazon Basin from S Colombia to N Bolivia and W Brazil . Conservation: IUCN – Lower Risk (lc) as P. simonsi and P. hendeei . Discussion: Placed in simonsi group by Patton (1987) . Gardner and Emmons (1984) included hendeei ; considered a separate species by Eisenberg and Redford (1999) . Karyotype has 2n=32 and FN=58 ( Gardner and Emmons, 1984 ; Patton and Gardner, 1972 ).