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Fascinating World of Echinoderms: Diversity and Characteristics

Echinoderms, with their spiny skin, internal skeleton, and unique water vascular system, exhibit 5-part radial symmetry. Discover their traits including reproduction, water vascular system, and diverse groups like Sea Urchins, Brittle Stars, Sea Cucumbers, Sea Stars, and Sea Lilies. Learn about their intriguing features and classification.

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Fascinating World of Echinoderms: Diversity and Characteristics

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  1. Phylum: Echinodermata

  2. Characteristics • “echino” = spiny • “derma” = skin • Spiny skin, internal skeleton, water vascular system, tube feet and 5 part radial symmetry • They are the most complex invertebrate phylum because they have skin, an anus and the larvae show bilateral symmetry. • Reproduction: Usually separate sexes. External fertilization.

  3. Water Vascular System – a system of internal tubes which aid in respiration, circulation and movement.

  4. 5 main groups of Echinoderms 1. Sea Urchins/Sand dollars • large internal plates that form a box around internal organs Live sand dollar Dead sand dollar Sea Urchin

  5. 2. Brittle Stars • Will shed an arm if attacked. Filter feeders and detritivores.

  6. 3. Sea Cucumbers • warty, moving, pickles. May eviscerate (vomit) up part of intestines/stomach if threatened.

  7. 4. Sea Stars • carnivores, can regenerate as long as central ring is present.

  8. 5. Sea Lilies/Feather Stars Sea lily Feather star

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