Key To Macroinvertebrates in Rivers and Streams
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Key To Macroinvertebrate s in Rivers and Streams Shell Present Shell Absent
description
Key To Macroinvertebrates in Rivers and Streams. Shell Present. Shell Absent. Shells. Single Shell (snails). Double Shell. “Shell” with legs. Go to Slide 1. Snails. Group III. Group I. Go to Slide 1. Group II Clams & Mussels. Go to Slide 1. No Legs. Legs Present. Wormlike. - PowerPoint PPT Presentation
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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