Flatworm (Planaria)

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MACROINVERTEBRATES
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Group 1

• Intolerant to pollution

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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.
• 222
• Size 5-45 mm

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Two-tailed Mayfly

• Filamentous gills on abdomen
• One tarsal claw on thoracic legs
• One pair of wing pads
• Two caudal filaments

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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

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Casebuilding Caddisfly

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

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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

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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

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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

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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

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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

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Cranefly - Larvae

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

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Water Penny - Larvae

• Disc-shaped, flattened and segmented
• Six pairs of jointed legs
• Brown/tan in color
• Size 10 mm

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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

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Whirligig Beetles - Adult

• Shiny black, oval body
• Eyes divided into two pairs
• Three pairs of legs

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Scud

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

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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

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Biting Midge

• Segmented, tan worm
• Cant easily determine head from tail
• No special structures
• Cylindrical body which preserves straight
• Size 16-27 mm

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Clams and Mussels

• Two calcareous shells or valves
• Various sizes
• Various colors
• Various shapes
• 4-22 mm

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Group 2

• Moderately intolerant to pollution

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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

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Riffle Beetle - Adult

• Dark brown/black with long legs
• Two tarsal claws per leg
• No hair on legs
• Antenna
• Size 7-27 mm

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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

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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

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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

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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

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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

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Crayfish

• Two chelipeds
• Walking legs
• Swimmerets
• Antennae
• Size 10-150 mm

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Group 3

• Fairly tolerant to pollution

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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

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Operculate Snails

• Operculum (hard calcareous disc used to close
  aperture
• Gills
• Size 3-42 mm

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Midge

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

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Sowbug

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

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Flatworms

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

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Planorbid Snails

• Shell coiled in one plane
• Aperture does open to right or left
• Size 6-16 mm

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Limpets

• Small, cup-shaped shells
• Side view, looks triangular
• Size 4-5 mm

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Right-handed Snail (b)

• Aperture opens to the right, when held with spire
  on top
• Gills
• Size 4-16 mm

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Group 4

• Very tolerant to pollution

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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

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Left-handed Snail (c)

• Aperture opens to the left, when held with spire
  on top
• Lungs
• Size 9-18 mm

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Aquatic Worms

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

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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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