Pseudoscorpionidae

Pseudoscorpionidae, a group of Arachnida (q.v.) which have a long, clawed pair of appendages arising from the head, which give them somewhat the aspect of small scorpions. The abdomen, however, is very different, as in these it is broad and flat throughout, and has no narrow posterior part (metasoma). The best-known member is the "book scorpion" or Chelifer.