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Fascinating World of Echinoderms: Traits and Biology

Explore the diverse traits and biology of echinoderms, marine creatures with spiny skin and radial symmetry. Learn about their complete digestive tract, internal skeleton, water vascular system, and unique tube feet. Discover the different classes of echinoderms and their reproductive processes. Delve into their feeding habits, nervous system, and regeneration capabilities. Uncover the fascinating world of these coelomates with bilaterally symmetrical larvae.

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Fascinating World of Echinoderms: Traits and Biology

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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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