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No shell
Unsegmented
body
No legs
Flatworms
Legs
Segmented
body
Shell
Short, stubby legs (prolegs)
Long, thin
body
Suckers on both
ends
Snails
Worms
Leeches
True flies
Clearly defined legs
Uncased caddisflies
4 plus pairs of legs
Tufted
tail
3 pairs of legs
Pincer-like front legs
No wings
Yes
No
Tail
Elongated
tail
Wings
Stoneflies
No Tail
Crabs
Shrimp
Generally 3 tails
Hard, leathery front wings
(NB. Wings may be folded)
2 tails
Feathery or plate-like
gills on abdomen
Bugs and beetles
Beetle larvae
Portable shelter/
covering (made of
sand, leaves,
sticks)
Bulging eyes
Humped back, fish like
way of swimming
Dragonflies
Cased caddisflies
No feathery gills on abdomen
Long body
Other mayflies
Minnow
mayflies
Damselflies
Side view
Side view