Content Outline for Teaching - Potosi School District - Home

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17 Section 2 Content Outline for Teaching Invertebrate Animals Sponges, Cnidarians, Flatworms, and Roundworms Underlined words and phrases are to be filled in by students on the Note-taking Worksheet. A. Sponges—don’t move to find food since adults are sessile or stuck in one place 1. Filter feeders—filter food out of water that flows through body a. Pores let water into central cavity. b. Flagella keep water moving through sponge. 2. Soft sponge bodies are protected by sharp spicules or rubbery spongin. 3. Sponges reproduce sexually and asexually. a. In asexual reproduction a new sponge grows from pieces of an old sponge. b. Most sexually reproducing sponges are hermaphrodites,producing both eggs and sperm. B. Cnidarians—have tentacles and hollow bodies 1. Two body shapes a. Polyp cnidarians are usually sessile and have vase-shaped bodies. b. A medusa body is free-swimming and bell-shaped. 2. Cnidarians reproduce both sexually and asexually. a. Polyp forms reproduce asexually by budding. b. Some polyps also reproduce sexually by releasing sperm or eggs. c. Medusa forms have a two-stage life cycle in which they reproduce both sexually and asexually. C. Flatworms—search for their food 1. Have long, flattened bodies with organs and systems 2. Most are parasites living off or in a host. 3. Tapeworms—a type of flatworm a. Lack a digestive system and absorb nutrients from the host’s intestines b. Tapeworms reproduce sexually. Invertebrate Animals 54
17 Content Outline for Teaching Invertebrate Animals (continued) D. Roundworms—very common animals 1. Body is a tube within a tube. 2. Digestive tract has both a mouth and an anus. 3. Diets vary with some roundworms being decomposers, some predators, and some parasites. Discussion Question What are some differences between sponges and roundworms? Mobility, digestion, reproduction, symmetry Invertebrate Animals 55
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Content Outline for Teaching - Potosi School District - Home

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