Tags: Crustacean.
Aenigmastacus crandalli is a species of fossil freshwater crayfish. It was found in Eocene lake deposits in British Columbia and was described in 2011. It is the first member of the Gondwana-distributed family Parastacidae to be found in the Northern Hemisphere and is the only species in the genus Aenigmastacus. Twelve specimens are known with a total body length of 3–5 cm (1.2–2.0 in). On some specimens details of the internal anatomy can be seen due to the exceptional preservation.