1. Aquatic Insect Identification and Review

2. Mayfly Ephemeroptera Very Sensitive
Facts
About 700 species in North America
Develop in the stream over period of two weeks to two years
Live on exposed rock surfaces in fast current or buried in soft stream beds
Large numbers of flying adults may emerge from stream at the same time

3. Mayfly Ephemeroptera Very Sensitive
Description
Platelike or feathery gills along the side of the abdomen
Two or three long hairlike tails
Six segmented legs on middle section of body
Each leg has one claw on the end
The body can be up to one inch long
Body is usually flat

4. Mayfly

5. Mayfly

6. Trichoptera Caddisflies Very Sensitive
Some make houses or cases for themselves out of different materials such as rocks, sand, gravel, twigs or leaves using a glue-like substance secreted from their back end
Some spin webs to trap food from the flowing water
One generation hatches per year
Although most species are very sensitive to pollution, some are pollution tolerant

7. Trichoptera Caddisflies Very Sensitive
Up to 1 1/2 inches long
Very small or no antennae
Six segmented legs on upper middle section of body
Filamentous gills may be on the end of the body or on the underside
Two small, thick extensions at the end of the body and each has a single hook at the end

8. Caddis Fly

9. Caddis Fly

10. Plecoptera Stoneflies Very Sensitive
Facts
About 500 species in North America
Are found in cool, clean streams with high levels of dissolved oxygen
Develop in the stream for period of three months to three years
Are either predators or feed on fungi and bacteria from rotting leaves

11. Plecoptera Stoneflies Very Sensitive
Description
Two long antennae
Two hair-like tails
Gills often located on or behind each leg
Six segmented legs on middle section of body
Each leg has two hooks on the end

12. Stone Fly

13. Stone Fly

14. Odonata Damselflies Moderately Tolerant
Facts
Develop over one to four years

15. Odonata Damselflies Moderately Tolerant
Description
Large eyes
Large scoop-like lower lip
No gills on the sides or underneath the abdomen
Six long segmented legs on upper middle section of body
Long spindly legs
Narrow body with three oar-shaped tails (gills) that look like fans

16. Damselfly

17. Damselfly

18. Amphipoda Scud Moderately Tolerant
Facts
They swim rapidly on their sides and are nicknamed "side swimmers"
Usually found where there are plants in the water

19. Amphipoda Scud Moderately Tolerant
Description
Seven pairs of tiny segmented legs
Two pairs of antennae
Color is white to clear
Resembles a freshwater shrimp
Hard, platelike shell except over the head and upper body

20. Scud

21. Isopoda Sowbug Moderately Tolerant

22. Dobsonflies Megaloptera Very Sensitive
Facts
Develop from one to four years
Carnivorous and may bite
Description
One to four inches long

23. Dobsonflies Megaloptera Very Sensitive
Mouth has large, chewing pinchers
Six segmented legs on middle section of body with tiny pinchers at the end of each
Many fleshy, filamentous appendages on each side of the abdomen
Back end is forked with two short tails and two hooks on each tail
Gill tufts on the underside of the tail that look like "hairy armpits"

24. Dobsonfly

25. Dobsonfly

26. Odonata Dragonflies Moderately Tolerant
Facts
Develop over one to four year period

27. Odonata Dragonflies Moderately Tolerant
Description
Large eyes
Large scoop-like lower lip
Wide oval or round abdomen that may end in three wedge-shaped extensions
No gills on the sides or underneath
Six long segmented legs on upper middle section of body

28. Dragonfly

29. Dragonfly

30. Diptera (True Flies) Almost 2000 species in North America
Facts
Almost 2000 species in North America
Are found in all but the most polluted aquatic conditions
Presence in large numbers may indicate organic enrichment
Up to 1/2 inches long

31. Diptera (True Flies)
The back end sometimes has a tiny pair of extensions that look like brushes
A thin dark line (digestive tract) can be seen inside the body
Thin, slightly curved, segmented and inch-worm-like body

32. Crane fly Moderately Tolerant

33. Crane fly Moderately Tolerant

34. Diptera BlackFly Tolerant
a number of species of small humpbacked flies, the females of which are bloodsucking!
Black flies are typically dark in color with broad, transparent wings. Adults range in size from 2.5 to 3.5 mm (0.01 to 0.14 in).
Black flies are sometimes called buffalo gnats or (improperly) sand flies.

35. Diptera BlackFly Tolerant
Humans as well as domestic animals may be viciously attacked. The eyes, ears, nostrils, wrists, and all exposed parts of the body of man are subject to attack. The extreme pain, itching, and the resultant local swellings, together with occasional severe complications, indicate the presence of an active allergin.

36. Diptera BlackFly Tolerant

37. Diptera BlackFly Tolerant

38. Decapoda Crayfish Moderately Tolerant
They grow by shedding ("molting") their shells
Must hide while their new shell hardens to protect their soft bodies
Often found hiding under rocks during the day and foraging on the stream bed during the night
Females may be seen with eggs or young clinging to the underside of their abdomen.
Most live only two years, but some may live up to six or seven years

39. Decapoda Crayfish Moderately Tolerant
Description
Up to six inches long
Eyes stand out from the body
Two or four antennae
Body covered with hard, platelike shell
Ten legs, two of these are large claws
Color is red, orange, brown or dark-colored

40. Crayfish

41. Mosquito Diptera Tolerant
There are about 150 species of mosquitoes in North America.
Larvae are aquatic, most feeding on algae, protozoans, and organic debris; a few species are predaceous on other mosquito larvae.
Males and females feed on nectar and plant juices. Only females feed on blood.
Females vector pathogens of major diseases including malaria (protozoan), yellow fever (virus), filariasis (nematode), dengue (virus), and certain types of encephalitis (virus).

42. Mosquito Diptera Tolerant
Wings with scales on veins and along the margins.
Proboscis long.
Antennae with 6 or more segments, plumose on males and short-haired on females.

43. Mosquito Diptera Tolerant

44. Mosquito Diptera Tolerant