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Lowland swamps, ditches and sloughs
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Lowland rivers (southeast Missouri)
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Lowland swamps, ditches and sloughs
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Alderfly Larvae
Sialis spp.
Aquatic Pillbugs and Sowbugs (Aquatic Isopods)
Freshwater members of the crustacean order Isopoda
Aquatic Spiders
Dolomedes spp., Tetragnatha spp., and others
Bryozoans (Moss Animals)
Freshwater species in the phylum Bryozoa
Caddisfly Larvae
Various species in the order Trichoptera
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
Damselfly Larvae
Species in the suborder Zygoptera
Dragonfly Larvae
Species in the suborder Anisoptera
Fishfly Larvae
Chauliodes, Neohermes, and Nigronia spp. (in eastern US)
Freshwater Jellyfish
Craspedacusta sowerbii (syn. C. sowerbyi)
Freshwater Mussels
Bivalve molluscs in order Unionoida
Giant Water Bugs
Species in the genera Abedus, Belostoma, and Lethocerus
Venomous
Gilled Aquatic Snails (Prosobranch Pond Snails)
Over 20 Missouri species in former subclass Prosobranchia
Horse and Deer Fly Larvae
Tabanus, Chrysops, and related genera
Hydras
Various species in the genus Hydra
Leeches
Various species in the subclass Hirudinea
Lunged Aquatic Snails (Pulmonate Pond Snails)
Over 30 Missouri species in former subclass Pulmonata
Mayfly Larvae
There are hundreds of species in North America.
Mississippi Grass Shrimp
Palaemonetes kadiakensis
Painted Devil Crayfish
Lacunicambarus ludovicianus
Paintedhand Mudbug
Lacunicambarus polychromatus
Predaceous Diving Beetles (Water Tigers)
Species in the beetle family Dytiscidae
Ramshorn Snails
Gyraulus, Helisoma, Menetus, Micromenetus, Planorbula spp.
Scuds and Sideswimmers (Amphipods)
Species in the crustacean order Amphipoda
Shield Crayfish (Ditch Fencing Crayfish)
Faxonella clypeata
Stonefly Larvae
There are hundreds of species in North America
Tubificid Worms (Tubifex Worms)
Tubifex spp. and other aquatic tubificid annelids
Turbellarians (Planarians; Free-Living Flatworms)
Species in genera Dugesia, Planaria, etc.
Water Scavenger Beetles
Beetles in the family Hydrophilidae
Water Scorpions
Ranatra spp. and Nepa apiculata
Water Striders
Aquarius remigis; also species in the genus Gerris
Whirligig Beetles
Species in the beetle family Gyrinidae
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