Pollution Sensitive Organisms (require high levels of dissolved oxygen & found in good quality water)

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8 Terms

1
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Stonefly Nymph

  • ½ - 1 ½ inches in length (minus tails)

  • 2 sets of wing pads

  • Branched gills between legs on underside of body (helps distinguish from another type of fly)

  • Yellow or brown in color

  • TWO tails

  • Prominent antenna

  • Two claws at the end of each leg

<ul><li><p>½ - 1 ½ inches in length (minus tails)</p></li><li><p>2 sets of wing pads</p></li><li><p><strong>Branched gills between legs</strong> on underside of body (helps distinguish from another type of fly)</p></li><li><p>Yellow or brown in color</p></li><li><p><strong>TWO tails</strong></p></li><li><p>Prominent antenna</p></li><li><p><strong>Two claws</strong> at the end of each leg</p></li></ul>
2
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Mayfly Nymph

  • Up to 1 inch in length (excluding tails)

  • Noticeable gills on abdomen (distinguishing from other type of fly)

  • Two rows of long hairs present on inside of front legs

  • One claw on each foot

  • Slender antennae

  • May be minnow-like with a vertically oriented head and three tails (as pictured) or may be more flattened with a horizontally oriented head and two tails

<ul><li><p><strong>Up to 1 inch in length (excluding tails)</strong></p></li><li><p><strong>Noticeable gills on abdomen (</strong>distinguishing from other type of fly)</p></li><li><p>Two rows of long hairs present on inside of front legs</p></li><li><p><strong>One claw on each foot</strong></p></li><li><p>Slender antennae</p></li><li><p>May be minnow-like with a vertically oriented head and three tails (as pictured) or may be more flattened with a horizontally oriented head and two tails</p></li></ul>
3
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Case-Making Caddisfly Nymph

  • Up to 1 ½ inch in length

  • Antennae reduced and inconspicuous

  • Curls up slightly (not as tightly as the common net-spinning caddisfly)

  • Builds distinctive cases made of sticks, rocks, sand, plant material and/or other debris

<ul><li><p>Up to 1 ½ inch in length</p></li><li><p>Antennae reduced and inconspicuous</p></li><li><p>Curls up slightly (not as tightly as the common net-spinning caddisfly)</p></li><li><p><strong>Builds distinctive cases</strong> made of sticks, rocks, sand, plant material and/or other debris</p></li></ul>
4
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Free-living Caddisfly Nymph

  • Up to 1 ½ inch in length

  • Antennae reduced and inconspicuous

  • Curls up slightly (not as tightly as the common net-spinning caddisfly)

  • Well defined segments

  • Do not build a case and instead moves throughout their environment

  • Three pairs of legs

  • Two claws at posterior end

<ul><li><p>Up to 1 ½ inch in length</p></li><li><p>Antennae reduced and inconspicuous</p></li><li><p>Curls up slightly (not as tightly as the common net-spinning caddisfly)</p></li><li><p>Well defined segments</p></li><li><p>Do not build a case and instead moves throughout their environment</p></li><li><p><strong>Three pairs of legs</strong></p></li><li><p><strong>Two claws at posterior end</strong></p></li></ul>
5
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Aquatic Snipe Fly Larvae

  • ¼ to 1 inch in length

  • Mostly cylindrical, with the front tapering to a cone-shaped point

  • Body is pale brown to green color

  • Larva have several paired caterpillar-long prolegs

  • Two stout, pointed tails with feathered hairs at back end

<ul><li><p>¼ to 1 inch in length </p></li><li><p>Mostly cylindrical, with the <strong>front tapering to a cone-shaped point</strong></p></li><li><p>Body is pale brown to green color</p></li><li><p>Larva have several paired caterpillar-long prolegs</p></li><li><p><strong>Two stout, pointed tails</strong> with feathered hairs at back end</p></li></ul>
6
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Water Penny

  • ½ an inch in length

  • Flat disk-like body

  • Head and legs concealed from above

  • 6 legs and branched gills on underside

  • Usually found attached onto smooth rocks where they graze on algae

<ul><li><p>½ an inch in length</p></li><li><p><strong>Flat disk-like body</strong></p></li><li><p>Head and legs concealed from above</p></li><li><p><strong>6 legs and branched gills on underside</strong></p></li><li><p>Usually found attached onto smooth rocks where they graze on algae</p></li></ul>
7
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Riffle Beetle

  • 1/16 to 1/8 an inch

  • Body small, usually oval

  • Legs stare long

  • Slender antennae

  • Walk slowly underwater

    • They do not swim on the surface!

  • Larva look similar to caddisflies, but are much smaller

<ul><li><p>1/16 to 1/8 an inch</p></li><li><p><strong>Body small, usually oval</strong></p></li><li><p>Legs stare long</p></li><li><p>Slender antennae</p></li><li><p>Walk slowly underwater</p><ul><li><p>They do not swim on the surface!</p></li></ul></li><li><p><strong>Larva look similar to caddisflies, but are much smaller</strong></p></li></ul>
8
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Gilled Snail

  • ¼ to 1 inch

  • Shell opens on right

  • Shell opening covered by a thin plate (operculum)

  • When monitoring, do not count empty shells!

<ul><li><p><strong>¼ to 1 inch</strong></p></li><li><p>Shell <strong>opens on right</strong></p></li><li><p>Shell opening covered by a thin plate (operculum)</p></li><li><p>When monitoring, do not count empty shells!</p></li></ul>

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