fish
inverts
   arthropods
   bacteria
   cnidaria
   colonial
   crustacea
     Anomopoda
     argulus
     crabs
     diplostraca
       Laevicaudata
       Onychocaudata
         Cladoceromorpha
           bosminidae
           cercopagididae
           chydoridae
           cladoceromorpha
           cyclestheriidae
           daphniidae
             ceriodaphnia
             daphnia
             daphniopsis
             megafenestra
             scapholeberis
             simocephalus
               congener
               exspinosus
               serrulatus
               vetulus
           holopediidae
           ilyocryptidae
           leptodoridae
           macrothricidae
           moinidae
           podonidae
           polyphemidae
           sididae
         Spinicaudata
     crayfish
     cyclops
     fairy shrimp
     gammarus
     mutations
     ostracod
     shrimp
     triops
   gastropods
   molluscs
   protists
   worms
misc
plants