
Corylophidae is a family of beetles, sometimes known as the minute fungus beetles. ...
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http://en.wikipedia.org/wiki/Corylophidae

Corylophidae (or Orthoperidae) is a family of tiny beetles. They are distinguished by an oval or round shape and the head invisible from behind as it is hidden by the pronotum. They live in mouldy wood, under bark, on rotting vegetation, in fungi and in wet, marshy situations.
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http://www.probertencyclopaedia.com/browse/BCA.HTM
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