Plutoniumidae is a family of centipedes belonging to the order Scolopendromorpha. Centipedes in this family are blind and have 21 pairs of legs.

The Cryptopidae are a family of scolopendromorph centipedes. Cryptopids are blind and possess 21 pairs of legs. The genus Cryptops is the numerically largest in the family, comprising over 150 species