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heterostracan

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heterostracan


  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  heterostracan 
  n  :  extinct  jawless  fish  with  the  anterior  part  of  the  body 
  covered  with  bony  plates;  of  the  Silurian  and  Devonian 




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