Aplacophora
  無板綱
  Ap·la·coph·o·ra n. pl.  Zool. A division of Amphineura in which the body is naked or covered with slender spines or setæ, but is without shelly plates.
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  Aplacophora
       n : an order of Amphineura [syn: Solenogastres, order
           Solenogastres, order Aplacophora]