Mollusks and Echinoderms

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Across
  1. 1. name for the overall shell of a sea urchin and sand dollar
  2. 3. innermost portion of a seastar
  3. 5. modified structure used for jet propulsion
  4. 7. mollusk with elongated mantle and tentacles/arms and eyes
  5. 8. sea slug
  6. 10. term used to describe the "arms" of sea stars
  7. 11. mouth appendage of a sea urchin containing teeth
  8. 14. meaning "spiny skin"
  9. 16. tissue found in mollusks typically used to create a shell
  10. 17. top surface of sea stars
  11. 19. used by many mollusks for burrowing, modified into arms/tentacles in cephalopods
  12. 20. structure that pumps water into the vascular system of starfish
  13. 21. elongated echinoderm with flexible body and respiratory trees
Down
  1. 2. echinoderm with elongated spines for locomotion and protection
  2. 4. modified antennae of nudibranchs
  3. 6. scraping tongue found in gastropods
  4. 9. specialized appendages found in feather stars and sea lilies for movement
  5. 12. skeletal plates found in sea urchins and sand dollars
  6. 13. radial symmetry made of 5 segments
  7. 15. original portion of bivalve shells
  8. 18. numerous appendages used by echinoderms for various purposes such as locomotion and feeding
  9. 22. mollusk with two shells such as a clam