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Aquatic Macroinvertebrates Characteristics Chart This chart was designed to aid in the identification of aquatic macroinvertebrates and is a supplement to the dichotomous key in Chapter 4 of your Introductory Notebook, Stream Insects & Crustaceans “blue bug card” and the Key to Macroinvertebrate Life in the River. Key: = present = sometimes present Flattened body Shell Caterpillar-like Distinct head Large eyes Obvious antennae Obvious mouth parts Mask-like lower lip No legs Prolegs Six segmented legs More than six segmented legs Gills Hard plate(s) Wings/Wing pads Gills Hard plate(s) Lateral filaments Prolegs Hooked prolegs Suction pad(s) Tail(s) Abdomen Thorax Head 1. Stonefly Nymph 2. Caddisfly Larva 3. Mayfly Nymph 4a. Riffle Beetle Larva 4b. Riffle Beetle Adult 5. Water Penny Larva 6. Gilled Snail (right-handed) 7. Dobsonfly Larva (hellgrammite) 8. Dragonfly Nymph 9. Sowbug 10. Alderfly Larva 11. Fishfly Larva 12. Damselfly Nymph 13. Clam/Mussel 14. Scud 15. Other Beetle Larva 16. Watersnipe Fly Larva 17. Crane Fly Larva 18. Crayfish 19. Aquatic Worm 20. Black Fly Larva 21. Midge Fly Larva 22. Leech 23. Pouch Snail (left-handed) 24. Other Snails Other macroinvertebrates you may encounter that are not included in our count/protocol. 25. Planaria 26. Deer Fly/Horse Fly 02/10 STR 423 Images by Bouchard, R.W., Jr. 2004. Guide to Aquatic Macroinvertebrates of the Upper Midwest, except where otherwise noted.

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Page 1: Aquatic Macroinvertebrates Characteristics Chart › assets › bugchart.pdf · 2019-11-05 · Aquatic Macroinvertebrates Characteristics Chart This chart was designed to aid in the

Aquatic Macroinvertebrates Characteristics Chart

This chart was designed to aid in the identification of aquatic macroinvertebrates and is a supplement to the dichotomous key in Chapter 4 of your Introductory Notebook, Stream Insects & Crustaceans “blue bug card” and the

Key to Macroinvertebrate Life in the River.

Key: = present = sometimes present

Flat

tene

d bo

dySh

ell

Cat

erpi

llar-

like

Dis

tinct

hea

dL

arge

eye

sO

bvio

us a

nten

nae

Obv

ious

mou

th p

arts

Mas

k-lik

e lo

wer

lip

No

legs

Prol

egs

Six

segm

ente

d le

gs M

ore

than

six

seg

men

ted

legs

Gill

s H

ard

plat

e(s)

Win

gs/W

ing

pads

Gill

s H

ard

plat

e(s)

Lat

eral

fi la

men

ts

Prol

egs

Hoo

ked

prol

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Suct

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pad(

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il(s)

AbdomenThoraxHead

1. Stonefly Nymph

2. Caddisfly Larva

3. Mayfly Nymph

4a. Riffle Beetle Larva

4b. Riffle Beetle Adult

5. Water Penny Larva

6. Gilled Snail (right-handed)

7. Dobsonfly Larva (hellgrammite)

8. Dragonfly Nymph

9. Sowbug

10. Alderfly Larva

11. Fishfly Larva

12. Damselfly Nymph

13. Clam/Mussel

14. Scud

15. Other Beetle Larva

16. Watersnipe Fly Larva

17. Crane Fly Larva

18. Crayfish

19. Aquatic Worm

20. Black Fly Larva

21. Midge Fly Larva

22. Leech

23. Pouch Snail (left-handed)

24. Other Snails

Other macroinvertebrates you may encounter that are not included in our count/protocol.

25. Planaria

26. Deer Fly/Horse Fly

02/10STR 423 Images by Bouchard, R.W., Jr. 2004. Guide to Aquatic Macroinvertebrates of the Upper Midwest, except where otherwise noted.

Page 2: Aquatic Macroinvertebrates Characteristics Chart › assets › bugchart.pdf · 2019-11-05 · Aquatic Macroinvertebrates Characteristics Chart This chart was designed to aid in the

1. Stonefly Nymph 2. Caddisfly Larva 3. Mayfly Nymph

4a. Riffle Beetle Larva

4b. Riffle Beetle Adult

5. Water Penny Larva 6. Gilled Snail (right-handed) 7. Dobsonfly Larva (hellgrammite)

8. Dragonfly Nymph 9. Sowbug 10. Alderfly Larva

11. Fishfly Larva

12. Damselfly Nymph

13. Clams/Mussels 14. Scud 15. Other Beetle Larva

16. Watersnipe Fly Larva

17. Crane Fly Larva

18. Crayfish 19. Aquatic Worm 20. Black Fly Larva

21. Midge Fly Larva

22. Leech 23. Pouch Snail (left-handed)

24. Other Snail 25. Planaria 26. Deer Fly/Horse Fly

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