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Phylum Echinodermata

Phylum Echinodermata. “Spiny – skin” Radially symmetrical (Penta - 5 parts) Complete digestive tract, coelom, and an internal skeleton (endoskeleton). Water – vascular system Tube feet Ampullae (muscular sac) Madreporite (sieve plate) Bilaterally symmetrical larvae bipinnaria

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Phylum Echinodermata

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  1. Phylum Echinodermata • “Spiny – skin” • Radially symmetrical (Penta - 5 parts) • Complete digestive tract, coelom, and an internal skeleton (endoskeleton)

  2. Water – vascular system • Tube feet • Ampullae (muscular sac) • Madreporite (sieve plate) • Bilaterally symmetrical larvae • bipinnaria • Deuterostomes • Coelomates • Blastopore develops into anus

  3. Types of Echinoderms • Class Asteriodea (sea stars) • Class Ophiuroidea (brittle stars) • Class Echinoidea (sea urchins and sand dollars) • Class Holothuroidea (sea cucumbers) • Class Crinoidea (feather stars and sea lilies)

  4. Biology of Echinoderms • Feeding and Digestion • Cardiac stomach (invert into prey) • Pyloric stomach (digestive glands) • Nutrients transported by coelomic fluid • Nervous system • Little known about nervous system • Reminiscent of nerve net • Nerve ring and radial nerve

  5. Biology of Echinoderms • No circulatory, excretory, respiratory organ systems • Reproduction • Separate sexes • External fertilization • Regeneration

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