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opisthobranchiata

opisthobranchiata


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Opisthobranchia  \O*pis`tho*bran"chi*a\,  Opisthobranchiata 
  \O*pis`tho*bran`chi*a"ta\,  n.  pl  [NL.,  from  Gr  ?  behind  +  ? 
  gills.]  (Zo["o]l.) 
  A  division  of  gastropod  Mollusca,  in  which  the  breathing 
  organs  are  usually  situated  behind  the  heart.  It  includes  the 
  tectibranchs  and  nudibranchs.