Chapter 15 Marine Science

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Across
  1. 2. Spiny-skinned animals with radial symmetry, internal skeleton, but no body segments
  2. 4. Extensions of an echinoderm's water vascular system that stick out from the body and function in movement and obtaining food.
  3. 6. bulblike structure at the top of each tube foot, used in movement
  4. 8. Solitary, nocturnal echinoderm, with long, skinny arms for moving
  5. 9. Echinodermata means?
  6. 11. In sea stars, tiny light receptors located at the end of each arm
  7. 13. echinoderm having many feathery arms, usually atop a jointed stalk
  8. 14. structure that secretes enzymes to digest food
  9. 16. in sea stars, a network of water-filled canals that enables movement
  10. 19. In sea star, small filter on dorsal surface through which water enters
  11. 21. plates made up of calcium carbonate
  12. 22. In sea stars, small, ciliated projections on the skin, used for breathing
  13. 23. light- receptor at tip of each arm
Down
  1. 1. in sea urchins, five-toothed mouth part for eating algae
  2. 3. Round echinoderm, with no arms and long spines covering skin
  3. 5. Crinoids that move by means of flapping their feathery arms
  4. 7. hollow space in the central disk and in each arm
  5. 10. Round echinoderm, with no arms and short spines covering skin
  6. 11. an internal skeleton; first seen in echinoderms
  7. 12. what kind of radial symmerty do they usually have?
  8. 15. sessile crinoids with feathery arms; live attached by a stalk to the seafloor
  9. 17. Zone Sea stars live in?
  10. 18. echinoderms that usually have five arms radiating from a central body
  11. 20. cilitated fingerlike projection on dorsal surface