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Missouri Department of Conservation
MDC Discover Nature
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Aquatic Spiders
Dolomedes spp., Tetragnatha spp., and others
Bryozoans (Moss Animals)
Freshwater species in the phylum Bryozoa
Freshwater Mussels
Bivalve molluscs in order Unionoida
Hydras
Various species in the genus Hydra
Predaceous Diving Beetles (Water Tigers)
Species in the beetle family Dytiscidae
Ramshorn Snails
Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.
Turbellarians (Planarians; Free-Living Flatworms)
Species in genera Dugesia, Planaria, etc.
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