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Key To Macroinvertebrates in Rivers and Streams

1. Key To Macroinvertebrates in Rivers and Streams. Shell Present. Goto slide 2. Shell Absent. Goto slide 3 . Shells. 2. Goto slide 7 . Single Shell. Double Shell. Goto slide 8. “Shell” with legs. Goto slide 11 . 3. Legs Present. No Legs. Goto slide 4. Wormlike.

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Key To Macroinvertebrates in Rivers and Streams

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  1. 1 Key To Macroinvertebrates in Rivers and Streams Shell Present Goto slide 2 Shell Absent Goto slide 3

  2. Shells 2 Goto slide 7 Single Shell Double Shell Goto slide 8 “Shell” with legs Goto slide 11

  3. 3 Legs Present No Legs Goto slide 4 Wormlike Goto slide 9 Looks like a bunch of sticks or sand stuck together With tentacles, brushes or “tails” Goto slide 12 Goto slide 10

  4. 4 Legs Present Ten + Legs Goto slide 11 Three Pairs of Legs Goto slide 5 Elongated body, “extra appendages” Goto slide 14

  5. 5 “Tail” filaments present Goto slide 6 “Tail” filaments absent Goto slide 13

  6. 6 Two “Tail” filaments Goto slide 15 Three “Tail” filaments Goto slide 16

  7. 7 Snails Group III Group I

  8. 8 Group II Clams & Mussels

  9. 9 Group III Leeches Group III Other Worms Group III Midge Larvae

  10. 10 Group II Crane Fly, Horse Fly, Deer Fly Larvae Group III Black Fly Larvae

  11. 11 Group II Scuds or Side swimmers - Amphipods Crustaceans Group II Crayfish - Decapods Group II Sowbugs - Isopods

  12. Group I 12 Group III

  13. Group II 13 Group I

  14. 14 Group I Group II

  15. 15 Group I Group II Other Beetle Larva

  16. 16 Group II Group I

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