Lecture 32: Echinoderms

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4 Terms

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deuterostome groups

  1. echinoderms

  2. chordata

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diagnostic features of echinodermatas

  1. pentaradial symmetry

  2. water vascular system (for locomotion, feeding, waste/nutrient transport, and respiration)

  3. calcareous endoskeleton with catch collagen under neutral control

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echinoderm diversity

  1. crinoids (feather stars) with dorsal oral surface

  2. asteroids (sea stars) feed on bivalves

  3. ophiuroids include fast-moving predators (brittle stars) and filter feeders (basket stars)

  4. echinoids (sea urchins and sand dollars) are slow-moving algal grazers

  5. holothuroids (sea cucumbers)

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where did bilateral symmetry evolve

secondarily in the MRCA of echinoids and holothuroids