Primary tabs

Here are some more critters without backbones.
Invertebrates
Sea Lamprey
Sea lampreys are members of an ancient family of "jawless fishes" that were around before the dinosaurs.
Read More
Zebra Mussel
These critters remove incredible amounts of food from the water.
Read More
Aquatic Sowbug or Isopod
The isopod is a scavenger that uses its seven pairs of legs to move around.
Read More
Backswimmer illustration
The name of this critter describes it perfectly.
Read More
Bristle worms, Photo Credit: Prilfish
These tiny, uncommon animals have pairs of bristles on each segment.
Read More
Caddisfly illustration
The caddisfly lives only a short time as an adult but may spend several years as a larva.
Read More
Crawling Water Beetle, Photo Credit: Robert Webster
This beetle lives among plants in shallow water.
Read More
Crawfish illustration
One of the most interesting of the aquatic animals.
Read More
Cyclops or Copepod illustration
The copepod is a small crustacean that looks like a swimming apostrophe mark (').
Read More
Damselfly illustration
The damselfly is closely related to the dragonfly.
Read More
Alderfly nymph illustration
Trout and other fish find the young of these insects delicious.
Read More
Earthworm
Want to watch an earth-moving, dirt munching, soil making machine?
Read More
Fairy shrimp, Photo Credit: Distant Hill Gardens
This graceful animal lives only in temporary ponds, never in pond
Read More
Fingernail Clam
This pale tiny clam never gets bigger than a fingernail.
Read More
Fisher Spider, Photo Credit: Dave Houston\Department of Conservation
This water spider has eight legs, no wings and a body which is di
Read More
Mussels
How would you like to have a shell, no eyes and catch your food with your nose? No?
Read More
Giant Water Bug eating a minnow
This huge insect sometimes grows to be two or more inches in length.
Read More
Horsehair Worm
This unsegmented worm looks just like a horsehair.
Read More
Hydra
The amazing hydra is related to the jellyfish.
Read More
Leech
Can you imagine one of your friends clinging onto you, sucking your blood?
Read More
Mayfly Nymph
The mayfly and damselfly nymphs look almost like twins.
Read More
Midge or Bloodworm larva
Young midges can be found in all sorts of water; some live in hot springs at temperatures of 124°
Read More
Mosquito biting skin illustration
This interesting insect goes through four distinct stages.
Read More
Freshwater mussels on rock in water
Winged mapleleaf, rock-pocketbook, monkeyface—sounds like World Wrestling Federation wrestlers?
Read More
Orb, Gilled, and Pouch Snails illustration
Think how hard it would be to carry your house on your back! That's what a snail does.
Read More
Phantom Midge larva
The phantom midge larva is so clear it's nearly invisible.
Read More
Planaria
The planaria or flatworm looks a lot like a garden worm.
Read More
Predaceous Diving Beetle
This beetle is one of the most common of all aquatic beetles.
Read More
Sign that says mandatory watercraft inspection ahead
A quagga mussel feeds all year, even in winter.
Read More
Person holding Rusty Crayfish
Most alien invaders come from another country, but not this one.
Read More
Graphic of salamander life cycle
A tadpole with gills!
Read More
Scud
Can you tell why the scud is often called the sideswimmer?
Read More
Seed shrimp, Photo Credit: Dann Thombs
This almost microscopic member of the freshwater plankton is a scavenger.
Read More
Spider web with dew
Are you afraid of spiders? There's a name for that fear—Arachnophobia.
Read More
Springtail
Just like people at a mall, these tiny wingless insects mill around in huge numbers.
Read More
Stonefly on rock
Can you imagine living your whole adult life and not eating anything!
Read More
Frog Life Cycle
Baby frogs or toads are called tadpoles.
Read More
Nematode
The threadworm is commonly found in bottom muck or sand throughout the world.
Read More
Tubifex Worm
This aquatic angleworm is right at home in mucky water.
Read More
Water Boatman illustration
This insect's body is shaped like a boat, perfect for swimming.
Read More
Water flea or daphnia
Did you ever itch to catch a water flea?
Read More
Water mite
The water mite is a round critter with eight legs and one eye.
Read More
Water Scavenger Beetle
Just as you would expect from its name, this large beetle feeds on dead stuff.
Read More
Water Scorpion Nepa
How long can you stand without moving?
Read More
Water Strider
The water strider is sometimes called the "Jesus Bug" because it can walk on water.
Read More
Whirligig Beetle
This beetle zips in wild patterns all around the surface of quiet water.
Read More
Crawfish illustration
Lake life is plentiful and not all lake creatures are easy to see.
Read More

At a Glance