Leech
Segmented, suckers,
contracts and expands
Mayfly Larva
Flatworm
Not segmented, flat body,
eye-spots on top of head
expands
Mayfly Larva
Horsehair Worm
Tan to brown, long
Mayfly Larva
Bristle worm
Threadworm
No sucker, body with
bristle
Small, hair-like
Mayfly Larva
Crayfish
Midge Larva
Red, green and tan,
distinct head
Isopod
*
Gills on abdomen, long
tails (3 tails)
Water Mite
Four pairs of legs,
brightly coloured, very
small
* Non-native Invasive Species
Gills on abdomen, long
tails (3 tails)
Fishing Spider
Four pairs of legs, walks
on top of water layers
Fatherly gills, large legs
(3 tails)
No gills on abdomen,
plate-like tails (3 tails)
Dragonfly Larva
Caddisfly Larva
Hinged mouth, no
obvious tail, large body
Uncased green, tan,
orange or white body, no
obvious tail
10+ legs
Water Penny
Suction cup-like, no
obvious tail
10+ legs, walks on
bottom
Caddisfly Larva
Cased, no obvious tail
Freshwater Shrimp
Curved shape, pale
grey,20mm, two pairs
of legs
Limpet
Single shell, conical
shape
Pond Skater
Walk on water, 3 pairs of
legs (2 of which are long)
Water Slater
Two white spots on the
head
Freshwater Snails
Coiled, spiral opening,
single shell
Tubifex Worm
Segmented, red/brown
Stonefly Nymph
Two tails, tail long and
stiff
Clam
Double shell, 0.5-3.5
cm
Damselfly Nymph
Three tails, no gills on
abdomen
Rat-tailed Maggot
Larva
Three-segments, tubelike
Amphipod
Caddisfly Larva
10+ legs, shrimp like
Lives in house made of all
sort of materials, no
obvious tail
Water Boatmen
Black back, leathery
wings
Aquatic Beetles
Black hard exoskeleton,
hard wings
Fingernail Clam
Penny
Very small, white,
double shell
Water Flea
1-5mm , segmented,
head bent downwards
Water Scorpion
Long like a stick,
leathery wings
Alderfly Larva
Spines on the sides,
one tail, small