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Phylum: Echinodermata

Phylum: Echinodermata. 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.

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Phylum: Echinodermata

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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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