Anomura

from The Collaborative International Dictionary of English v.0.48

Anomura \An`o*mu"ra\, Anomoura \An`o*mou"ra\, n. pl. [NL., fr.
   Gr. ? lawless + o'yra` tail.] (Zool.)
   A group of decapod Crustacea, of which the hermit crab in an
   example.
   [1913 Webster] Anomural