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| Exercise 9: Porifera Exercise 9 is a study of representative of members of the phylum Porifera, the sponges. Students study sponge cell types and all three sponge body forms: ascon, sycon, and leucon. They are asked to think about the correlation between sponge body size and canal organization. Exercise 10: Cnidaria (Coelenterata) Exercise 10 is a study of three classes of cnidarians: Hydrozoa, Scyphozoa, and Anthozoa. It begins with a discussion of radiate, tissue-level organization and phylum characteristics. Slide and preserved specimens are used to study representatives of the three classes. Students study the relationships among the classes using a cladogram in worksheet 10.1. |