molluscpaper

molluscpaper - Meredith Fulton Section 414 March 18, 2008...

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Meredith Fulton Section 414 March 18, 2008 Mollusc Evolution The chiton, belonging to the class polyplacophora and the squid, belonging to the class cephalopoda, have distinct visible and functional differences that have made them better suited for their different habitats even though they have a common ancestor. The chiton has a hard outer shell, secreted by the mantle, and has an overall flattened, elongated shape. The foot of the chiton is also large and elongated. The combination of a long, flat, hardened shell and large foot, allows the chiton to cling to rocks with great force while searching for food. In shallow habitats, the chiton is exposed to wave action which could knock it off the rock if it was not for the strong foot that developed. The chiton’s radula is strong and sharp so that it is able to scrape algae off of rocks. All of these characteristics are distinctly different from that of the squid. A squid has no external shell; instead the shell was internalized and the mantle is actually the
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molluscpaper - Meredith Fulton Section 414 March 18, 2008...

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