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

Explore the unique characteristics and classifications of flatworms, mollusks, and annelids, their reproductive systems, and interrelated phyla. Understand their anatomy, digestive systems, and diverse reproductive strategies. Discover the differences between these fascinating creatures and their place in the animal kingdom.

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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. The intermediate host in the tapeworm life cycle is the flea.

  6. 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.

  7. heart intestine mantle cavity mantle stomach digestive gland radula foot salivary gland mouth anus crop • radula (scraping “teeth”) • mantle (skin-like tissue, may form a shell) • Ctenidia (flat gills, also called book lungs) • Mollusks share at least one of three features.

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

  9. Mollusks have a variety of reproductive strategies. • Most strategies involve sexual reproduction. • Some species are hermaphrodites. • Have both male and female sex organs • (But don’t reproduce with themselves) • Examples: tapeworms, snails, earthworms

  10. 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.

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

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