Echinoderms
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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. Basic Features. Coelum Radial symmetry Larvae = bilateral Closest vertebrate relative

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Echinoderms

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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


Basic Features

  • Coelum

  • Radial symmetry

    • Larvae = bilateral

  • Closest vertebrate relative

    • Development similar to chordates (deuterostomes)

    • Endoskeleton


Larval Pictures (Bilateral Symmetry)


Closest Relative


Reproduction

  • Sexual

    • Most have separate male/female sexes

    • Gametes released into water

  • Asexual

    • Regeneration: regrowing lost body parts


Think about this the next time you swallow ocean water


Nice regeneration story


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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