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KEY CONCEPT Flatworms, mollusks, and annelids belong to closely related phyla.

Explore the distinct characteristics and classifications of flatworms, mollusks, and annelids. Learn about their reproductive systems, body structures, and unique traits that set them apart within their phyla.

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KEY CONCEPT Flatworms, mollusks, and annelids belong to closely related phyla.

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  1. KEY CONCEPTFlatworms, mollusks, and annelids belong to closely related phyla.

  2. reproductive system eyespot head pharynx mouth sucker gut cavity Flatworms are simple bilateral animals. • Flatworms have a solid body and incomplete or absent gut. • There are three classes of flatworms. • planarians

  3. Flatworms are simple bilateral animals. • Flatworms have a solid body and incomplete or absent gut. • There are three classes of flatworms. • planarians • flukes

  4. Flatworms are simple bilateral animals. • Flatworms have a solid body and incomplete or absent gut. • There are three classes of flatworms. • planarians • flukes • tapeworms

  5. Mollusks and other bilateral animals have a complete digestive tract. A complete digestive tract has two openings: a mouth and an anus. Flatworms are the only bilateral animals without a complete digestive tract. Mollusks are diverse animals.

  6. heart intestine mantle cavity mantle stomach digestive gland radula foot salivary gland mouth anus crop • radula • mantle • ctenidia • Mollusks share at least one of three features.

  7. gastropods • pelecypods (also called bivalves) • cephalopods • Most mollusks are classified into three (of seven) classes.

  8. Mollusks have a variety of reproductive strategies. • Most strategies involve sexual reproduction. • Some species are hermaphrodites.

  9. brain blood vessels hearts muscle mouth digestive tract segment nerve cord Annelids have segmented bodies. • Segmentation refers to the repeated sections of an annelid’s body. • The coelom is a fluid-filled space completely surrounded by muscle.

  10. There are three groups of annelids. • earthworms • marine worms • leeches

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