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Fossil range: Mesozoic–Recent
|Northern koura, Paranephrops planifrons(Parastacidae)|
Crayfish, crawfish, or crawdads – members of the superfamilies Astacoidea andParastacoidea – are freshwater crustaceans resembling small lobsters, to which they are related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators.