Group IIIGroup IIIPollution-TolerantPollution-Tolerant

Benthic Benthic MacroinvertebratesMacroinvertebrates

Aquatic WormsAquatic Worms

Aquatic Aquatic earthwormsearthworms

Horsehair wormsHorsehair worms

MDC photos

Midge Fly LarvaeMidge Fly Larvae

No jointed legsNo jointed legs

Prolegs behind Prolegs behind head and end of head and end of abdomenabdomen

Very small Very small (<(<11//44”)”)

MDC photo

NABS photo

Black Fly LarvaeBlack Fly Larvae

Swollen abdomen Swollen abdomen (“fat butt”) for (“fat butt”) for attachmentattachment

Fan-like Fan-like projections on projections on head for filteringhead for filtering

Very smallVery small

MDC photo

Photo courtesy of J. Abbott – U. of Texas

Black Fly AdultBlack Fly Adult

NABS photo

LeechesLeeches

MuscularMuscular

Suction disks on Suction disks on both head and both head and end of abdomenend of abdomen

NABS photos

Pouch SnailsPouch Snails

When holding When holding the snail with the snail with the point up, the the point up, the shell opens to shell opens to the the leftleft

MDC photo

Other SnailsOther Snails

Has no spiral Has no spiral pointpoint

Flat/pond snailsFlat/pond snails

Thank you!Thank you!

"I fish because I love to, because I live the environs where trout are found, which

are invariably beautiful.” - Robert Travers