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entomostracan 
  n 
1 any small crustacean of the group (formerly subclass) Entomostraca, including the branchiopods, ostracods, and copepods 
  adj 
2 of, relating to, or belonging to the Entomostraca 
  (C19: from New Latin entomo- + Greek ostrakon shell; see ostracize) 
 entomostracous  adj 

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