Cybister explanatus, alias Cybister fusculus, is a species of beetle in the family Dytiscidae that occurs in western North America and Middle America. It is in the Nealocomerus subgenus of Cybister, which denotes a Cybister species from the Nearctic region. Being a predaceous diving beetle, it is aquatic and primarily found in lentic, or still-water, habitats, as well as valleys. It has been known to often have an important carnivorous role in these ecosystems. Distinctive physical traits of C. explanatus include the sharp points of the hind legs’ metafemora and the yellow lining of the elytra and pronotum's margins. C. explanatus is notable for being edible, serving as a taco filling in Mexico and as foodstuff.

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