Section 2

objectives

• Describe the basic body plan of a cnidarian.

• Summarize how cnidarians feed.

• Describe the nervous system of cnidarians.

• Identify and give examples of the four classes of cnidarians.

• Describe the common characteristics of ctenophores.

vocabulary medusa polyp epidermis gastrodermis mesoglea gastrovascular cavity tentacle cnidocyte nematocyst nerve net planula coral reef colloblast apical organ bioluminescence figure 33-3

The contrasting forms of medusae and polyps result from different arrangements of the same body parts. Medusa forms are free-floating and jellylike. Jellyfish are medusae. Polyp forms, such as hydras and sea anemones, are usually attached to a rock or some other object.

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