Class Oligochaeta ex. Earthworm
Class Polychaeta ex. Bristleworm
Class Hirudnea ex. Leeches
This shows the internal structure of an earthworm.

Like the other image, this shows the internal structure of an earthworm. However. these parts are narrowed down in order to relate more to the digestive system.

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The clitellum, the girdle-like structure near the head of the worm, produces cocoons. Here, eggs are fertilized by sperm cells and the cocoon is deposited in the soil. Click here to see a baby earthworm hatching from its cocoon!

An earthworm has five hearts! Watch them beat in this video!

This is the internal structure of a bristleworm.
This is the external structure of a bristleworm.

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A bristleworm uses its parapodia, the muscular bristle appendages along its side, to move. Watch a bristleworm move up close.

This is a type of bristleworm known as a bearded fireworm.

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Watch a type of bristleworm, a fireworm, move rapidly about the ocean.

Lumbricus terrestris (Earthworms)

by Chelsea
Fierce Frogs

General Structure
This image shows the internal structure of an earthworm.

It might be hard to see, but this is an actual earthworm that has been dissected!

Click here to see a video clip on how an earthworm's digestive track works.

Want to learn some more facts? Click here to read more about earthworms.

Go to this video to see how an earthworm moves through its habitat. You can also go to the links below to check out other videos of earthworms.

Bristle Worms

Want to see a close up of a bristle worm's digestive track? Click here. Look closely though, because the movement of food is very slow.

Go here to see pictures of bristle worms and other marine worms.

This picture is of a bristle worm in its natural habitat

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Be careful where you swim or you will end up with a rash that comes from the poison in the bristle worms parapodias!

By Abigail Smith

The external structure of an earthworm from anterior to posterior

like the picture above in chelsea's section, this picture shows the internal structure...this shows the path in which the food enters the body of the earthworm

Want to watch how an earthworm processes its food? It's really cool, I promise. Just for fun, see if you can identify the clitellum, and then, as the video zooms in see if you can find the pharynx, the esophagus, then the crop, the gizzard and then the intestine. Before you click though, look at the above diagrams and get the main idea of where these parts are. If you have to watch the video more than once, great! More practice!

For locomotion, this video shows the movement of the earthworm, and also has labels for you to click on for better understanding. Click on all of them and see if you can eventually point out the parts without the labels!


this is the bristleworm's internal structure

Earthworms and bristle wormsby asa ardenwacky woodchucks
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This is a picture of a cross section of an earthworm.
This is a picture of the bottom of a bristle worm and the top.

To see earthworms mating go here
to see the earthworms move and the egg ball go here


Natalie Salmon - Punishers

This is an image of the structure of an earthworm, including both external and internal sections.
This picture shows the parts of the digestive system of an earthworm.

Learn how an earthworm moves, or watch a live one move around!
(First website: Click "now", then navigate using right hand bar)
(Second website: Click "video clips", then choose one of the videos. This site also provides other information!)

Join Ernie the earthworm as he shows teaches you about himself.
(Click "virtual worm tour")

Learn some fun facts about the contributions earthworms make for soil.

Test your new knowledge about earthworms with this short quiz!


This is an image of a bristleworm, otherwise known as a fire worm because the hairs on its body are filled with poison.

Watch this video to see a bristleworm eating a coral polyp.
(The bristleworm is hard to see, but it's in the center)


Leeches suck on blood
This picture shows a carefully dissected leech with all its internal organs visible and intact.

Click here to watch how leeches move!!

Check out this great link for more information on leeches, also if you're up to it check out this link to some fun facts about leeches!
To see real leeches being used in medicine! Click this link.