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Mollusks: Expanding Evolution - Understanding the Coelom

Dive into the world of mollusks and their evolutionary advancements. Learn how the presence of a true body cavity, the coelom, enhances muscle functioning and circulatory systems. Uncover the defining characteristics of the classes Gastropoda, Bivalvia, and Cephalopoda with a focus on shells, mobility, and feeding mechanisms.

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Mollusks: Expanding Evolution - Understanding the Coelom

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  1. Mollusks

  2. Evolutionary Advancement: The Coelom (true body cavity) Enables the muscles to be separated from the gut so that digestion of food is not hindered by muscle contraction for movement A coelom provides a space where the circulatory system can transport blood Definition: Mollusks are invertebrates with a soft, unsegmented body often enclosed in a hard shell

  3. Class: Gastropoda

  4. Characteristics: Most gastropods have a single shell, a head, and are motile.

  5. Class: Bivalvia

  6. Characteristics: Most bivalves have two shells, no head, and are sessile.

  7. Bivalves use siphons to feed

  8. Class: Cephalopoda

  9. Characteristics: Most cephalopods have no shell, a head, and are rapid swimmers.

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