Lecture 5 Animal Evolution – The Invertebrates - PowerPoint PPT Presentation

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. Echinoderms • Means spiny-skinned. • Coelomate animals with spines, spicules/plates of calcium carbonate in the body wall-serve as defensive functions. • E.g Star fishes, sea urchins, sea cucumbers • Most have well-developed internal skeleton. • Adults are radial with some bilateral symmetry. • Active preadtors

  3. Echinoderms • Adults are brainless but with decentralized nervous system which responds to food, predators and so forth coming in any directions. • Have tube-feet. • Tube-feet: • fluid-filled, muscular structures & sucker-like adhesive disks. • used for walking, burrowing, clinging to rocks, gripping clams/snails. • components of a water-vascular system unique to echinoderms.

  4. Tube feet