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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 habitat of the cryptozoa allows avoidance of fluctuations of temperature and humidity, which makes the contained range of considerably different species quite remarkable. Moreover, cryptozoa are notable for their inclusion of often unnamed varieties of organisms.
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Habitat
Sometimes referred to as the cryptozoic niche, the habitat allowing for cryptozoic life is characterized by a shielding of exterior light sources, with stable and cool temperature and high humidity. Forest humus and leaf litter can provide the necessary conditions for crytpozoic life in part because of the shielding from surrounding trees. Nonetheless, temperate woodlands are not the only ground for such a habitat: the tropics and the desert are often suitable for cryptozoa, such as scorpions or Solifugae.
Examples
Examples of the cryptozoa include land-planarians, amphipods, pill-woodlice, centipedes, pill-millipedes, thysanurans, false-scorpions and oribatid mites.