1A. With a Shell

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1B. Without a Shell

Go To 3

2A. Shell made of two parts held together by a hinge

CLAM

2B. Shell made of only one part

SNAIL

3A. Body flat, oval, and brown

WATER PENNY

3B. Body not exactly like this

4

4A. With six legs

5

4B. With more than six legs

12

4C. With less than six legs; body often worm-like

14

5A. With two or three thin, hair-like tails

6

5B. Without thin, hair-like tails

7

6A. With one hook at the end of each leg; usually with three tails,occasionally only two tails

MAYFLY

6B. With two hooks at the end of each leg; two tails

STONEFLY

7A. Body with many long, pointed parts

8

7B. Body no exactly like this

9

8A. Body brown or black,often very large

HELLGRAMMITE

8B. Body white, yellow, or tan; not so large

BEETLE LARVA

9A. Body with hook-like claws at tail end; animal sometimes protected with bits or sand, pebbles,or twigs

CADDISFLY

9B. Body without hook-like claws

10

10A. Body small, dark, hard, and beetle-like

RIFFLE BEETLE

10B. Body not exactly like this

11

11A. With three wide tails

DAMSELFLY

11B. Without tails, but with three short points

DRAGONFLY

12A. With two large claws and eight legs; large

CRAYFISH

12B. Without large claws; smaller

13

13A. Body flattened side to side; usually white

SCUD

13B. Body flattened top to bottom; usually gray

SOWBUG

14A. Body with very small legs; usually with a head

15

14B. Body without any legs or head

16

15A. Tail-end of body wider than the other

BLACK FLY LARVA

15B. Tail-end of body not wider

MIDGE

16A. Body brown, plump, caterpillar-like

CRANE FLY LARVA

16B. Body not exactly like this

17

17A. Body with suckers at each end

LEECH

17B. Body without suckers; small, thin and worm-like

AQUATIC WORM