| Aenigmastacus crandalli Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Family: | Parastacidae |
| Genus: | †Aenigmastacus Feldmann, Schweitzer & Leahy, 2011 |
| Species: | †A. crandalli
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| Binomial name | |
| †Aenigmastacus crandalli Feldmann, Schweitzer & Leahy, 2011
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Aenigmastacus crandalli is a species of fossil freshwater crayfish. It was found in early Eocene Okanagan Highlands 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.