Key To Macroinvertebrates in Rivers and Streams
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Transcript of Key To Macroinvertebrates in Rivers and Streams
Key To Macroinvertebrates in
Rivers and Streams
Shell Present
Shell Absent
Shells
Single Shell (snails)
Double Shell
“Shell” with legs
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Snails
Group I Group III
Group IIClams & Mussels
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No Legs
Wormlike
With tentacles, brushes or “tails”
Legs Present
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Group IIILeeches
Group IIIOther Worms
Group IIIMidge Larvae
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Group IICrane Fly, Horse Fly, Deer Fly Larvae
Group IIIBlack Fly Larvae
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Legs Present
Ten + Legs
Three Pairs of Legs
Four Pairs of Legs
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Crustaceans
Group IICrayfish - Decapods
Group IIScuds or Side swimmers - Amphipods
Group IISowbugs - Isopods
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Wings Present – Adult Insects
Wings Absent – Insect Larvae or Nymphs
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Beetle – like InsectsWings hard
Other InsectsWings leathery
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Beetle – like InsectsWings hard
Group I
Not counted in index – record on data sheet
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Other InsectsWings leathery
Not counted in index – record on data sheet
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Firmly attached to rocks
Obviously free moving
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Group IGroup III
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“Tail” filaments present
“Tail” filaments absent
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Group II
Group II
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One or two “Tail” filaments
Three “Tail” filaments
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Elongated body, extra “appendages”
Six legs, obviously insects
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Group I
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Group II
Group IGroup IGroup II
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Other Beetle Larva
Group IGroup II
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Four Pairs of Legs
Not counted in index – record on data sheet
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Images from the following source:
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