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Aquatic Spiders
Dolomedes spp., Tetragnatha spp., and others
Backswimmers
About 32 North American species in the family Notonectidae
Bryozoans (Moss Animals)
Freshwater species in the phylum Bryozoa
Calico Crayfish (Papershell Crayfish)
Faxonius immunis (formerly Orconectes immunis)
Chinese Mystery Snail
Cipangopaludina chinensis malleata (syn. Bellamya chinensis)
Invasive
Crane Fly Larvae
There are over 500 species of crane flies in North America.
Crayfishes
About 36 species in Missouri
Devil Crayfish
Lacunicambarus aff. diogenes
Freshwater Mussels
Bivalve molluscs in order Unionoida
Hydras
Various species in the genus Hydra
Leeches
Various species in the subclass Hirudinea
Lilliput
Toxolasma parvus
Midge Fly Larvae
Nearly 1,100 species in North America
Pink Papershell
Potamilus ohiensis
Predaceous Diving Beetles (Water Tigers)
Species in the beetle family Dytiscidae
Ramshorn Snails
Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.
Stonefly Larvae
There are hundreds of species in North America
Turbellarians (Planarians; Free-Living Flatworms)
Species in genera Dugesia, Planaria, etc.
Virile Crayfish (Northern Crayfish)
Faxonius virilis (formerly Oronectes virilis)
Water Nymph Crayfish
Faxonius nais (formerly Orconectes nais)
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Aquatic insects and spiders (5)
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Soft-bodied aquatic invertebrates without shells (6)
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Big rivers (Missouri and Mississippi) (14)
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Clear, rocky rivers, streams and springs (16)
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Lowland rivers (southeast Missouri) (16)
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Lowland swamps, ditches and sloughs (17)
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