curve

fish
inverts
   Annelida
   Arthropoda
     Arachnida
     crustacea
     insecta
       diptera
       Odonata
       Hemiptera
         Belostomatidae
           Lethocerus
             americanus
         gnat
         Nepidae
   Bacteria
   Cnidaria
   Mollusca
   Porifera
   Protozoa
misc
plants

encycloquaria.com