
Cryptozoa is the collective name for animals that have not yet been identified by science. A large part of the cryptozoa are small (generally microscopic) animals that permanently live under conditions with high relative humidity; many of them can be found in any sample of wet soil. ...
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http://en.wikipedia.org/wiki/Cryptozoa

The assemblage of small terrestrial animals found living in darkness beneath stones, logs, bark, etc. often in cave entrances and includes species which are potential colonisers of caves.
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http://www.cancaver.ca/docs/glossary.htm
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