Pittier's crab-eating rat (Ichthyomys pittieri ) is a species of semiaquatic rodent in the family Cricetidae.It is endemic to Venezuela.The natural habitats of this species are rivers and swamps. Its karyotype has 2n = 92 and FNa = 98. This was previously thought to be the highest chromosome number known for a mammal, but it has since been found that the plains viscacha rat or red viscacha rat (Tympanoctomys barrerae ) has 4x = 2n = 102.
