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        | Distinguishing Characteristics  | 
       
      
        
          
            - Antennules two segmented
 
            -  In many species the old carapace is not cast off during molting, giving the appearance of nested shells
 
            - Postabdomen large with numerous marginal denticles and long lateral setae
 
            - Often covered with detritus 
 
           
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        | Additional Pictures | 
       
      
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