Echinoderms

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Across
  1. 5. canals that extend through the sea star arms
  2. 7. system of canals unique to echinoderms
  3. 10. the main diet of a sea star
  4. 11. class of feather stars
  5. 15. opening that pulls in water, also known as sieve plate
  6. 18. canal that attaches to sieve plate
  7. 19. class of sea cucumbers
  8. 20. class of sea stars
  9. 22. projections for gas exchange, also called papulea
Down
  1. 1. grooves that line the bottom of sea star and contain podia
  2. 2. class of sea urchins
  3. 3. class of brittle stars
  4. 4. type of symmetry in most echinoderms
  5. 6. number of stomach parts in sea star
  6. 8. appendages used for locomotion, also called podia
  7. 9. bony calcereous plates under the skin
  8. 12. bulb-like structures that hold water and attach to podia
  9. 13. top surface of sea star
  10. 14. process of ejecting the stomach
  11. 16. round canal in the central disc
  12. 17. shell of sea urchin
  13. 21. bottom surface of sea star with mouth