| GROUP I TAXA: Very intolerant to pollution
|
| 1. |
Stonefly: Order Plecoptera.
5-35 mm in length.
6 legs with hooked tips, antennae, 2 hairlike tails, smooth,
no gills on abdomen. |
| 2. |
Dobsonfly: Order Megaloptera, Family Corydalidae.
25-90 mm long.
6 legs, large pinching jaws, tuft-like gills on underside,
short antennae. |
| 3. |
Snipe Fly: Order Diptera, Family Athericidae.
10-18 mm long.
Elongated, cylindrical, with head mostly retracted into thorax, spiny prolegs, two fringed filaments at end of abdomen. |
| 4. |
Mayfly: Order Ephemeroptera, Family Leptophlebiidae.
5-15 mm long.
Platelike or feathery gills on side of abdomen, 2 or 3 long
hair-like tails. |
| |
|
GROUP II TAXA: Somewhat intolerant to pollution
and lower DO levels. |
| 5. |
Alderfly: Order Megaloptera, Family Sialidae.
10-25 mm long.
Light colored, single projection on abdomen, no hooks,
filaments on side of body. |
| 6. |
Crane Fly: Order Diptera, Family Tipulidae.
10-50 mm long.
Short prolegs, ridges on top of bulbous abdomen,
no distinct head. |
| 7. |
Caddisfly: Order Trichoptera
2-40 mm in length.
Hooked legs on upper third of body, 2 hooks on back end.
May be in a stick or rock case. |
| 8. |
Aquatic Moth: Order Lepidoptera
20-25 mm long.
Body with 5 paired knobs on underside of abdominal segments,
legs on first 3 segments. |
| 9. |
Dragonfly: Order Odonata, Suborder Anisoptera
15-45 mm long.
Lower lip is large and covers other mouthparts, large eyes,
3 pairs of legs on thorax. |
| 10. |
Damselfly: Order Odonata, Suborder Zygoptera
10-30 mm long.
Large eyes, 6 hooked legs, wide oval to round abdomen. |
| 11. |
Mayfly: Order Ephemeroptera, Family Heptageniidae
5-20 mm long.
Develops in cold clear streams, 2 or 3 hairlike tails, feathery gills along abdomen. |
| 12. |
Mayfly: Order Ephemeroptera, Family Caenidae
2-8 mm long.
Small hair like gills on abdomen, found in detrital sediments
or on thick algae. |
| 13. |
Mayfly: Order Ephemeroptera, Family Ephemeridae
12-32 mm long.
Feathery abdominal gills and tusks. Lives in silt deposits. |
| 14. |
Mayfly: Order Ephemeroptera, Family Oligoneuridae
8-17 mm long.
Found primarily in moderate to fast flowing streams, relatively large larvae. |
| 15. |
Water Mites: Class Arachnida, Hydracarina
Less than 3 mm long.
Body compact, spider like with 4 conspicuous pairs of legs. |
| 16. |
Water Penny: Order Coleoptera
4-6 mm long.
Flat saucer shaped, 6 tiny legs on ventral side. |
| 17. |
Riffle Beetle: Order Coleoptera, larva and adult
1-8 mm long.
Oval body covered with tiny hairs. 6 legs, antennae. |
| 18. |
Scud: Class Crustacea, Order Amphipoda
5-20 mm long.
Resembles a small shrimp. Eyes, if present, seen as spots
on side of head |
| |
|
GROUP III TAXA: Fairly tolerant to low DO levels
and organic nutrients. |
| 19. |
Black Fly: Order Diptera, Family Simuliidae
2-8 mm long.
One end of the body wider. Black head, suction pad on opposite end. |
| 20. |
Deer Fly: Order Diptera, Family Tabanidae
15-40 mm long.
No distinct head, cylindrical maggot like body with fleshy rings. |
| 21. |
Midge: Order Diptera, Family Chironomidae
2-30 mm in length.
Narrow wormlike body with distinct head. One pair of prolegs
at each end. Characteristic 'wiggler' movement. |
| 22. |
Soldier Fly: Order Diptera, Family Stratiomyidae
10-50 mm long.
Distinct head, somewhat flattened body. Often appearing stiff
and lifeless. |
| 23. |
Gilled Snail: Class Gastropoda
10-40 mm long.
Shell opening to the right, covered by a thin operculum. |
| 24. |
Sowbug: Class Crustacea, Order Isopoda
5-20 mm long.
Gray oblong body, more than 6 legs, long antennae. |
| 25. |
Planaria: Class Turbellaria
5-30 mm long.
Soft, flat body, crosseyed, spade shaped head. |
| 26. |
Asiatic Clam: Class Pelecypoda
10-50 mm long.
Hard limestone shells with toothed hinge. Ridged triangular shaped shell. Filter feeder. |
| 27. |
Native Clams and Mussels: Class Pelecypoda
2-250 mm long.
Shell with membranous hinge. |
| 28. |
Biting Midge: Order Diptera, Family Ceratopogonidae
2-15 mm long.
Very slender, hairlike body. Often wiggling horizontally. |
| 29. |
Crayfish: Class Crustacea, Order Decapoda
10-150 mm long.
8 legs, 2 large claws, resembles lobster. |
| |
|
GROUP IV TAXA: Very tolerant to low DO levels and increased levels of organic nutrients. |
| 30. |
Left Handed/Pouch Snail: Class Gastropoda
10-25 mm long.
No operculum, shell usually opens to the left. |
| 31. |
Segmented Worm: Class Oligochaeta
1-30 mm long.
Often red; looks like aquatic earthworm. Can be very tiny, thin segmented body. |
| 32. |
Leech: Class Hirudinea
5-50 mm in length.
Segmented, suckers on posterior and anterior ends. |