After reading this chapter and analyzing the content, it is assumed that you can: - Explain why radial symmetry is ideally suited for sessile and free–floating animals.
- Describe the characteristics of the Cnidaria phylum.
- List the classes in phylum Cnidaria.
- Contrast between polyp and medusa forms.
- Explain the discharging mechanism of a nematocyst.
- Describe the unusual features of cnidarians nervous system.
- Explain in what ways hydra is different from typical hydrozoans.
- List the cell types found in the epidermis and gastrodermis of hydra and include each cell type's function.
- Describe the feeding behavior of hydra.
- Define hydrorhiza, hydrocaulus, coensosarc, perisarc, hydranth, gonangium, and manubrium.
- Contrast statocyst with rhopalium, scyphomedusae with hydromedusae, scyphistoma with strobila and ephyrae, velum with velarium and pedalium, and Hexacorallia with Octocorallia.
- Define siphonoglyph, primary septa or mesenteries, incomplete septa, septal filaments, acontia thread, and pedal laceration.
- Describe the different types of interactions anemones have with nonprey organisms.
- Distinguish the skeletons of hexacorallians with alcyonarian corals.
- Explain why corals are geographically limited to shallow marine waters.
- Distinguish between the several types of recognized coral reefs.
- Explain the role of zooxanthellae to the well–being of hermatypic corals.
- Describe the characteristics of Ctenophore.
- Describe ctenophores swimming and feeding habits.
- Compare and contrast cnidarians with ctenophores.
- Explain why some biologists consider ctenophores and cnidarians triploblastic.
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