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        | Anus on dorsal side of postabdomen, generally with two rows of marginal denticles (md) with less than 80 teeth per side; typically less than 20 teeth per side.  | 
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        | Anus terminal, postabdomen with a single row of over 80 marginal denticles (md) creating a saw-like appearance.  | 
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        | Taxonomy | 
         
      
        
          
            | Phylum | 
            Arthropoda | 
           
          
            | Subphylum | 
            Crustacea | 
           
          
            | Class | 
            Branchiopoda | 
           
          
            | Suborder | 
            Cladocera | 
           
          
            | Family | 
            Chydoridae | 
           
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