Figure 1. Micrograph of a dorsal view of the polychaete Apistobranchus sp. (Spionida, Polychaeta) showing the head components and anterior segments of the body. This group of polychaetes has a pair of grooved palps originating from the head that are used for deposit feeding. The segments have well-developed parapodia with bundles of chaetae.

Figure 2. Micrograph of the polychaete Nereis sp. (Nereididae, Phyllodocida) showing its jaws retracted into the body. They can be everted for grabbing onto prey.

Figure 3. Micrograph of the polychaete Myrianida sp. (Syllidae, Phyllodocida) showing a series of schizogamous epitokes budding off from the back end. These fill with gametes and as they mature swim away to spawn with other epitokes. The bottom-dwelling form never develops gametes.

Figure 4. Photograph of a clump of feather-duster worms Demonax sp. (Sabellidae, Sabellida). These worms live in mucus and sediment tubes and project their feather palps into the water where they filter out passing plankton.

Figure 5. Photograph of a land leech (Hirudinea, Clitellata). This form is predatory on mammals.

Figure 6. Micrograph of a trochophore larva of a serpulid polychaete. This larva must feed on plankton for some weeks until it can settle as a young worm.