Annelid Groups

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Marine Worms

- Members of the class Polychaeta

- Have parapodia which increase surface area of the worm making gas exchange easier between the worm and the water



Earthworms

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- Members of the class Oligarchaeta

- Lack a distinctive head region and have no eyes
                  * Compensate with light-sensitive and touch-sensitive organs

Leeches

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- Members of the class Hirudinea 

- Contain bloodsuckers at both ends of their body