Echinoderms

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Across
  1. 4. canals that branch from the ring canal
  2. 6. opening into the water-vascular system, is a sievelike plate in sea stars
  3. 7. class which includes sand dollars and urchins
  4. 9. skeletal plates made of calcium carbonate
  5. 11. superclass of that includes Asteroidea and Ophiuroidea
  6. 14. class that includes sea cucumbers
  7. 16. bulblike, muscular structure that creates suction in tube feet
  8. 17. type of radial symmetry exhibited by echinoderms
  9. 18. series of canals (two words)
Down
  1. 1. _______ groove: runs the length of the oral surface of each arm
  2. 2. also called dermal branchiae, used to exchange gasses
  3. 3. class that includes brittle stars
  4. 5. extensions of the canal system used for locomotion and feeding (two words)
  5. 8. class that includes sea lilies and feather stars
  6. 10. canal that surrounds the mouth, foun in the c
  7. 12. phylum name; means "bears spiny skin"
  8. 13. pincherlike structures that clean the body surface
  9. 15. class that includes true sea stars