curve

fish
inverts
   Arthropoda
     Arachnida
     crustacea
     insecta
       diptera
       Odonata
       Hemiptera
         Belostomatidae
           Lethocerus
             americanus
         gnat
         Nepidae
   bacteria
   cnidaria
   colonial
   gastropods
   molluscs
   protists
   worms
misc
plants

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