 In the species "P. hylaeum", head and body length is and tail length is 125–45 mm.Judging from the skeletal remains, the largest species in the genus is "P. ipnaeum" (or Samaná hutia) and the smallest is "P. spelaeum".In the living species, the short, dense pelage is brownish or grayish on the upper parts and buffy on the underparts.