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heterostraci

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heterostraci


  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  Heterostraci 
  n  :  extinct  group  of  armored  jawless  fishes  or  fishlike 
  vertebrate;  taxonomy  is  not  clear  [syn:  {Heterostraci},  {suborder 
  Heterostraci}] 




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