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MACROINVERTEBRATES

MACROINVERTEBRATES. Group 1. Intolerant to pollution. 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. Two-tailed Mayfly. Filamentous gills on abdomen

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MACROINVERTEBRATES

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  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

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