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cephalopoda

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cephalopoda


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Cephalopoda  \Ceph`a*lop"o*da\,  n.  pl  [NL.,  gr  Gr  ?  head  + 
  -poda:  cf  F.  c['e]phalopode.]  (Zo["o]l.) 
  The  highest  class  of  Mollusca. 
 
  Note:  They  have  around  the  front  of  the  head,  a  group  of 
  elongated  muscular  arms,  which  are  usually  furnished 
  with  prehensile  suckers  or  hooks.  The  head  is  highly 
  developed,  with  large  well  organized  eyes  and  ears, 
  and  usually  with  a  cartilaginous  brain  case.  The  higher 
  forms,  as  the  cuttlefishes,  squids,  and  octopi  swim 
  rapidly  by  ejecting  a  jet  of  water  from  the  tubular 
  siphon  beneath  the  head.  They  have  a  pair  of  powerful 
  horny  jaws  shaped  like  a  parrot's  beak,  and  a  bag  of 
  inklike  fluid  which  they  can  eject  from  the  siphon, 
  thus  clouding  the  water  in  order  to  escape  from  their 
  enemies.  They  are  divided  into  two  orders  the 
  Dibranchiata,  having  two  gills  and  eight  or  ten 
  sucker-bearing  arms,  and  the  Tetrabranchiata,  with  four 
  gills  and  numerous  arms  without  suckers.  The  latter  are 
  all  extinct  except  the  {Nautilus}.  See  {Octopus}, 
  {Squid},  {Nautilus}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  Cephalopoda 
  n  :  octopuses;  squids;  cuttlefish;  pearly  nautilus  [syn:  {Cephalopoda}, 
  {class  Cephalopoda}] 




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