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Unformatted text preview: reef-builders since the Triassic period (some 230 million years ago), have symbiotic photosynthetic dinoflagellates living within the coral body. These dinoflagellates are in the genus Symbiodinium , and are termed collectively zooxanthellae, shown in Figure 13a. Figure 13b illustrates several living coral tyypes. Cells are organized into tissues. The adult in most species of cnidarian is radially symmetrical. The typical cnidarian life cycle involves both sexual and asexual reproduction. A bilaterally symmetrical larva known as a planula (shown in Figure 11), develops from a zygote . The planula moves around and eventually settles down in an appropriate location and grows into the adult polyp . The polyp grows and may eventually reproduce asexually to form medusae . Each medusa develops gonads and uses meiosis to form gametes ....
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- Fall '10
- Biology, Cnidaria, 100 mm, 230 million years, Sea anemone, zooxanthellae, 200 mm