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Phylum Echinodermata (Means spiny skin)

Phylum Echinodermata (Means spiny skin). Echinodermata. Classes. Asteriodea(Stelleroids). Sea stars. Aka starfish. Echinodermata. Classes. Crinoidea/Crinoids. Feather stars. Sea lilies. Echinodermata. Classes. Echinoidea/Echinoids. Sea urchins, sand dollars.

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Phylum Echinodermata (Means spiny skin)

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  1. Phylum Echinodermata (Means spiny skin)

  2. Echinodermata Classes Asteriodea(Stelleroids) Sea stars Aka starfish

  3. Echinodermata Classes Crinoidea/Crinoids Feather stars Sea lilies

  4. Echinodermata Classes Echinoidea/Echinoids Sea urchins, sand dollars Compact body within a shell No arms, often spiny

  5. Echinodermata Classes Holothuroidea (Holothuriods) Sea cucumbers Elongated body Leathery body wall with embedded ossicles (bony plates)

  6. (Add this to your hand out!) Ophiunoidea Brittle stars, Basket stars

  7. Echinodermata Common Characteristics Radial Symmetry as opposed to bilateral Like spokes on a wheel

  8. Echinodermata Common Characteristics Body may be round Or Cylindrical Or star shaped With 5 or more ambulacra (radiating areas)

  9. Echinodermata Common Characteristics Endoskeleton with spines or spicules Can regenerate lost parts

  10. Echinodermata Common Characteristics No head or brain Few specialized sensory organs Simple Nervous system Nerve ring / radial nerves No excretory organs

  11. Echinodermata Common Characteristics Water Vascular System Water is taken in at the madreporite Helps with respiration, Circulation and movement

  12. Specialized structures… • Mouth and anus – ingestion and excretion of digestive • wastes • Madreporite – sieve like structure through which water is • taken in. • Some species - gills

  13. Tube feet for movement • Gonads - make gametes (sperm and eggs)

  14. Echinodermata Anatomy

  15. Echinodermata Reproduction May be hermaphrodites Or gonochoric (two distinct sexes) Usually release sperm / egg into the water column External fertilization Many species synchronize this, along the lunar cycle

  16. Echinodermata Nutrition Most sea urchins scrape algae off surfaces They have specialized mouthparts for this Called Aristotle’s lantern A few are scavengers or predators

  17. Echinodermata Nutrition Brittle stars are mostly scavengers They crawl about on the bottom looking for dead stuff Some are active filter feeders Or just lay about waiting for food to float by and stick to them

  18. Echinodermata Nutrition Sea stars are carnivores They tear open mollusks with their arms Then extrude their own stomach out of their mouths to release digestive juices into the clam’s body.

  19. Answer to #6 on the hand out They eat mollusks like clams and mussels, some eat coral (‘Crown of thorns’)

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