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Stonefly nymph 5-35mm Caddisfly larva 2-40mm Mayfly nymph 3-10mm Alderfly nymph 10-25mm Fishfly larva 5-16mm Stonefly adult 10-40mm Caddisfly adult 14-25mm Mayfly adult 5-25mm Alderfly adult 24-50mm Water penny 4-6mm Hellgrammite (dobsonfly larva) 25-90mm Freshwater mussel 2-250mm Pouch snail 2-70mm Ramshorn snail 2-70mm Snipe fly larva 12-18mm Macroinvertebrate Identification Key GROUP 1 DO NOT TOLERATE POLLUTION
Dragonfly larva 15-50mm Damselfly larva 10-50mm Water beetle larva 2-6mm Whirligig beetle 3-15mm Riffle beetle adult 2-4mm Dragonfly nymph 30-50mm Damselfly nymph 10-50mm Water beetle 3-40mm Whirligig beetle larva 3-12mm Water strider 10-25mm Dragonfly adult mm Damselfly adult 25-55mm Backswimmer 5-16mm Waterboatman 5-16mm Cranefly larva 10-25mm Scud (amphipod) 5-21mm Crayfish mm Water scorpion 20-43mm Sowbug 5-22mm Freshwater clam mm Macroinvertebrate Identification Key GROUP 2 TOLERATE SOME POLLUTION
Blackfly larvae 3-12mm Midge larva 2-15mm Mosquito larva 1-6mm Flatworm (planaria) 1-6mm Freshwater worm 1-30mm Blackfly adult 2-5mm Midge adult 3-4mm Mosquito adult 6-13mm Leech 5-40mm Water snail 2-70mm Macroinvertebrate Identification Key GROUP 3 TOLERATE POLLUTION
PHOTO CREDITS Water penny, Mayfly nymph, Hellgrammite: Ohio Department of Natural Resources Freshwater clam: Center for Biodiversity, Illinois Department of Natural Resources Freshwater mussel: Illinois Natural History Survey Caddisfly larva: © 1999 McKensie Alderfly adult: © 1999 Thomas Ames Jr. Fishfly larva: © 2000 Wellfleet Bay Wildlife Sanctuary Riffle beetle adult, Crayfish, Leech, Water snail: © Jones & Bartlett Publishers Stonefly nymph, Alderfly nymph, Pouch snail: Illinois Department of Natural Resources Stonefly adult, Water strider, Waterboatman, Mosquito larva: Bastiaan Drees, Extension Entomology, Texas A&M University Mayfly adult: Extension Entomology, Texas A&M UniversityCaddisfly adult: © 1996 Blair Nikula, Extension Entomology, Texas A&M University Scud: museum Victoria Backswimmer: Peter J. Bryant Dragonfly adult: Bruno Manunza Dragonfly larva: © 1997 Forrest Mitchell, The Texas Agricultural Experiment Station Damselfly nymph: © 2001 D.J. Hollingworth, Department of Animal and Plant Sciences, The University of Sheffield Water beetle larva: Gerard Visser Water beetle: © 2000 Cedar Creek Natural History Area, University of Minnesota Cranefly larva: Jim Rathert Midge larva, Sowbug: Cliff White Blackfly larvae: University of Alberta, Department of Biological Sciences Blackfly adult: Robert Burns, Texas Agricultural Extension Service Mosquito adult: US Navy Disease Vector Ecology and Control Center Whirligig beetle: © 2000 Singapore Zoological Gardens Docents Whirligig beetle larva: Illinois River Watch
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