Ichthyomys
Encyclopedia
Ichthyomys is a genus of semiaquatic rodent
Rodent
Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing....

s in the family Cricetidae
Cricetidae
The Cricetidae are a family of rodents in the large and complex superfamily Muroidea. It includes true hamsters, voles, lemmings, and New World rats and mice...

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It contains the following species:
  • Crab-eating Rat
    Crab-eating Rat
    The Crab-eating Rat is a species of semiaquatic rodent in the family Cricetidae.It is found in Colombia, Ecuador, and Venezuela.Its natural habitats are rivers and swamps....

     (Ichthyomys hydrobates)
  • Pittier's Crab-eating Rat
    Pittier's Crab-eating Rat
    Pittier's Crab-eating Rat is a species of semiaquatic rodent in the family Cricetidae.It is found only in Venezuela....

     (Ichthyomys pittieri)
  • Stolzmann's Crab-eating Rat
    Stolzmann's Crab-eating Rat
    Stolzmann's Crab-eating Rat is a species of rodent in the family Cricetidae. It ist found in Ecuador and Peru. The species is believed to be nocturnal and semiaquatic, and has been found at an elevation range of 900 to 1700 m. A survey in 2010 indicates that it has become a pest at local fish...

     (Ichthyomys stolzmanni)
  • Tweedy's Crab-eating Rat
    Tweedy's Crab-eating Rat
    Tweedy's Crab-Eating Rat is a species of rodent in the family Cricetidae.It is found in two disjoint regions in western Ecuador and central Panama. The species is found near fast-flowing streams in primary and secondary forest, and is known from elevations of 900 to 1700 m...

     (Ichthyomys tweedii)


Members of the genus tend to be nocturnal and live along fast-flowing streams, where they feed on freshwater invertebrates such as crabs
Freshwater crab
There are around 1,300 species of freshwater crabs, distributed throughout the tropics and subtropics, divided among eight families. They show direct development and maternal care of a small number of offspring, in contrast to marine crabs which release thousands of planktonic larvae. This limits...

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