Phylum: Annelida

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Class: Clitellata - worms with a clitellum (has 2 clades: Oligochaeta & Hirundea combined to 1 class) Class: Polychaeta - traveling worms

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What characteristic is responsible for the branching off of the segmented worms from earlier animals?

eucoelomates

What level of organization do these organisms demonstrate?

organ level system

How many tissue layers do these organisms have?

triploblastic

What is the name of the bristles seen on some of these animals?

satae

What is the name of the side feet seen in some animals?

parapodia

When do they appear in the evolutionary history?

516 mya early Cambrian

What habitats are they found in?

ocean and freshwater

Type of Digestive System

Alimentary Canal

Type of Excretory system

Metanephridia

Type of Circulatory System

no true heart

Type of Respiratory System

Parapodia

Type of Nervous System

pair of cerebral ganglia

Type of Body Cavity

Eucoelomate