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Benthic macroinvertebrates for Ohio biotic index computation.
Tubifex Worm, Group 4
Bloodworm Midge Larva, Group 4
Leech, Group 4
Aquatic sowbug, Group 4
Pouch snail, Group 4
Scud, Group 3
Gilled snail, Group 3
Orb snail, Group 3
Blackfly larva, Group 3
Water penny, Group 2
Damselfly nymph, Group 2
Mayfly nymph, Group 2
Crawfish, Group 2
Cranefly larva, Group 2
Dragonfly nymph, Group 2
Caddisfly larva, Group 2
Dobsonfly larva, Group 1
Note 
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