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Echinoderms

Echinoderms. Basic Features. Spiny skinned animals Spines project through thin skin Well developed organ systems Water pumping system w/ internal canals Tube feet at ends. Tube Feet. Tube Feet. Basic Features. Coelum Radial symmetry Exception: sea cucumber Larvae = bilateral

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Echinoderms

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  1. Echinoderms

  2. Basic Features • Spiny skinned animals • Spines project through thin skin • Well developed organ systems • Water pumping system w/ internal canals • Tube feet at ends

  3. Tube Feet

  4. Tube Feet

  5. Basic Features • Coelum • Radial symmetry • Exception: sea cucumber • Larvae = bilateral • Closest to vertebrate relative • Development similar to chordates • Endoskeleton

  6. Larval Pictures (Bilateral Symmetry)

  7. Closest Relative

  8. Reproduction • Sexual • Most have separate male/female sexes • Gametes released into water • Asexual • Regeneration (fragmentation): regrowing lost body parts

  9. Feeding • Some filter feed • Some active predators • Pry open shells using tube feet • Stomach releases enzymes to liquify the prey • Fluid is sucked up

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