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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. 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.

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Key To Macroinvertebrates in Rivers and Streams

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  1. Key To Macroinvertebrates in Rivers and Streams Shell Present Shell Absent

  2. Shells Single Shell (snails) Double Shell “Shell” with legs Go to Slide 1

  3. Snails Group III Group I Go to Slide 1

  4. Group II Clams & Mussels Go to Slide 1

  5. No Legs Legs Present Wormlike With tentacles, brushes or “tails” Go to Slide 1

  6. Group III Leeches Group III Other Worms Group III Midge Larvae Go to Previous Slide Go to Slide 1

  7. Group II Crane Fly, Horse Fly, Deer Fly Larvae Group III Black Fly Larvae Go to Previous Slide Go to Slide 1

  8. Legs Present Ten + Legs Four Pairs of Legs Three Pairs of Legs Go to Slide 1

  9. Crustaceans Group II Scuds or Side swimmers - Amphipods Group II Crayfish - Decapods Group II Sowbugs - Isopods Go to Previous Slide Go to Slide 1

  10. Wings Present – Adult Insects Wings Absent – Insect Larvae or Nymphs Go to Slide 1

  11. Beetle – like Insects Wings hard Other Insects Wings leathery Go to Slide 1

  12. Beetle – like Insects Wings hard Not counted in index – record on data sheet Group I Go to Previous Slide Go to Slide 1

  13. Other Insects Wings leathery Not counted in index – record on data sheet Go to Slide 1

  14. Firmly attached to rocks Obviously free moving Go to Slide 1

  15. Group I Group III Go to Previous Slide Go to Slide 1

  16. “Tail” filaments present “Tail” filaments absent Go to Slide 1

  17. Group II Group II Go to Previous Slide Go to Slide 1

  18. One or two “Tail” filaments Three “Tail” filaments Go to Slide 1

  19. Elongated body, extra “appendages” Six legs, obviously insects Go to Slide 1

  20. Group I Group II Go to Slide 1

  21. Group I Group II Group I Other Beetle Larva Go to Slide 1

  22. Group II Group I Go to Slide 1

  23. Four Pairs of Legs Not counted in index – record on data sheet Go to Slide 8 Go to Slide 1

  24. Images from the following source: Go to Slide 1

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