Cryptozoa is the collective name for small animals who live in darkness and under conditions of high relative humidity, as in the wet soil underneath rocks, decomposing tree bark etc. Examples include pseudoscorpions, slugs, centipedes and earwigs.
The term "cryptozoa" describes a group of small animals that thrive in dark, moist environments like the soil beneath rocks or decaying wood.  Examples include pseudoscorpions, slugs, centipedes, and earwigs.