MACROINVERTEBRATES

1. MACROINVERTEBRATES

2. Group 1 • Intolerant to pollution

3. Stonefly • Heavy, armored body • Two tarsal claws on thoracic legs • Two sets of wing pads • Two caudal filaments • Gills under thorax, look like underarm hairs. • 2:2:2 • Size: 5-45 mm

4. Two-tailed Mayfly • Filamentous gills on abdomen • One tarsal claw on thoracic legs • One pair of wing pads • Two caudal filaments

5. Torpedo Mayfly • Filamentous gills on abdomen • One tarsal claw on thoracic legs • Hair on forelegs in two rows • One pair of wing pads • Three caudal filaments • Ventrally flattened • Size: 9-22 mm

6. Casebuilding Caddisfly • One hardened dorsal plate on first thoracic segment • Hooked caudal appendage • Case made of organic debris, stone, sand • Size: 6-30 mm

7. Clinging Mayfly • Filamentous gills on abdomen • One tarsal claw on thoracic legs • One pair of wing pads • Flattened, dorso-ventrally • Three caudal tails • Conspicuous eyes • Size: 5-21 mm

8. Hellgrammites - Dobsonfly • Elongated, flattened body • Long, thick lateral gills on abdomen • Hard plates on thorax • No wing pads • Abdomen ends in a pair of anal prolegs with two terminal hooks • Size: 30-79 mm

9. Hellgrammites - Alderfly Larvae • Elongated, slightly flattened body • Long, thick lateral gills on abdomen • Abdomen ends in a single filament • Hard plates on thorax • Size: 2-13 mm

10. - Broad-winged Damselfly • Slender body with long legs • Three leaf-like caudal gills with outer gills longer than middle • Developed wing pads • First antenna segment much longer than rest • Size 8-45 mm

11. Snipe Fly • Maggot-like body • Eight pairs of prolegs with hooklets • Long appendages at caudal tip of abdomen • Tubercles on top and sides of body

12. Cranefly - Larvae • Maggot-like body • 4-8 short tubercles at end of abdomen arranged in circle • Soft and membranous body • Size: 10-54 mm

13. Water Penny - Larvae • Disc-shaped, flattened and segmented • Six pairs of jointed legs • Brown/tan in color • Size: 10 mm

14. Whirligig Beetles - Larvae • Long filaments along abdomen • Abdomen terminates I a proleg with four small hooks • Tan/yellow in color • Small head compared to body • Size: 8-36 mm

15. Whirligig Beetles - Adult • Shiny black, oval body • Eyes divided into two pairs • Three pairs of legs

16. Scud • Shrimp-like sideswimmers • Segmented body • Flattened laterally with humped back • White/gray in color • Size: 5-21 mm

17. Dragonfly • Robust body with three pairs of jointed legs on thorax • No tails but may have two pointed caudal appendages • Brown color • Size: 13-61 mm

18. Biting Midge • Segmented, tan worm • Can’t easily determine head from tail • No special structures • Cylindrical body which preserves straight • Size: 16-27 mm

19. Clams and Mussels • Two calcareous shells or valves • Various sizes • Various colors • Various shapes • 4-22 mm

20. Group 2 • Moderately intolerant to pollution

21. Swimming Mayfly • Filamentous gills on abdomen • One tarsal claw on thoracic legs • One pair of wing pads • Three caudal filaments • No hair on forelegs • Laterally flattened • Size: 5-15 mm

22. Riffle Beetle - Adult • Dark brown/black with long legs • Two tarsal claws per leg • No hair on legs • Antenna • Size: 7-27 mm

23. Riffle Beetle - Larvae • Elongated, torpedo shape body • Brown/tan in color • Last abdominal segment has tuft of gills • Three pairs of • Size: 11-18 mm

24. Burrowing Mayfly • Filamentous gills on abdomen • One tarsal claw on thoracic legs • One pair of wing pads • Three caudal tails; • Mandibles resemble tusks • Size: 11-32 mm

25. Hydropsychid Caddisfly • Three hardened dorsal plates • Three pairs of thoracic legs • Abdomen lacks lateral appendages • Anal proleg on abdomen which terminates in a claw • Size: 7-33 mm

26. Crawling Mayfly • Filamentous gills on abdomen • One tarsal claw on thoracic legs • One pair of wing pads • Three caudal tails • Plate gills on abdomen • Flattened, dorso-ventrally • Size: 5-14 mm

27. Narrow-winged Damselfly • Slender bodies with long legs • Three leaf-like caudal gills similar in size • Antenna segments similar in size • Eversible mouthparts • Wing pads • Size: 8-45 mm

28. Crayfish • Two chelipeds • Walking legs • Swimmerets • Antennae • Size: 10-150 mm

29. Group 3 • Fairly tolerant to pollution

30. Black Fly - Larvae • Gray/Brown in color • Swollen abdomen • Conspicuous head • Fan-like antennae collect algae • Looks seed-like, with two antennae protruding • Size: 3-8 mm

31. Operculate Snails • Operculum (hard calcareous disc used to close aperture • Gills • Size: 3-42 mm

32. Midge • Conspicuous head • No tubules on abdomen • No tuft of gills • No colon eyespots • White in color • Size: 5-21 mm

33. Sowbug • Aquatic “Pillbug” • Segmented, armored brownish-gray body • Flattened ventrally • One antennae, one pair of jointed legs per segment • Size: 5-21 mm

34. Flatworms • Two eyespots • Soft-bodied • Non-segmented • Flat • Easily destroyed when handled

35. Planorbid Snails • Shell coiled in one plane • Aperture does open to right or left • Size: 6-16 mm

36. Limpets • Small, cup-shaped shells • Side view, looks triangular • Size: 4-5 mm

37. Right-handed Snail (b) • Aperture opens to the right, when held with spire on top • Gills • Size: 4-16 mm

38. Group 4 • Very tolerant to pollution

39. Leech • Flattened body, long or oval in shape • Two “cup-cake” suckers, on each end of body • Curls into C-shape • Head not readily identified • Size: 6-41 mm

40. Left-handed Snail (c) • Aperture opens to the left, when held with spire on top • Lungs • Size: 9-18 mm

41. Aquatic Worms • Thin, elongated body, truly segmented • Brown but turns to tan on preservation • Head not easily identified • Size: 2-33 mm

42. Blood Worm • Blood red when collected • Lose color turning tan/beige • Two pairs of tubules located ventrally • Eyespots resemble a colon: • Pair of prolegs which possess a tuft of hairs