Mollusk Crossword Puzzle

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Across
  1. 6. Strong muscles which extend between the shells to tightly hold a bivalve’s shell closed
  2. 8. Organs that remove metabolic wastes from a mollusk’s body
  3. 9. Type of circulatory system found in cephalopods; blood moves to and from tissues within blood vessels
  4. 15. Modified gills present in many aquatic mollusks; feathery or comb-like structures used for respiration
  5. 16. Type of symmetry exhibited by most mollusks
  6. 18. The term Cephalopod means this
  7. 20. Structure that connects the two shells of a bivalve
  8. 21. Material which composes the inner layer of a mollusk shell
  9. 22. The oldest part of a bivalve shell
  10. 23. Part of the mollusk body that contains most of the organs
  11. 25. The large, muscular organ mollusks use for locomotion and prey capture
  12. 28. The term Mollusk means this
  13. 30. Name for the outer layer of a mollusk shell
  14. 31. Another term for a mollusk shell
  15. 32. A copper-containing pigment which causes mollusks to have blue blood
Down
  1. 1. Another name for bivalves, meaning “hatchet-footed animals” after their shape
  2. 2. Structure used by filter feeding bivalves to bring in water containing small food particles
  3. 3. Another name for the foregut; receives and prepares food for digestion
  4. 4. Name for the middle layer of a mollusk shell
  5. 5. The term Bivalve means this
  6. 6. The oldest and smallest whorl of a univalve shell
  7. 7. The free-swimming larva that emerges from the egg in many mollusks
  8. 10. A rasping, tongue-like organ that is found in all mollusks except bivalves
  9. 11. Animals found on rocky marine shorelines with 8 overlapping plates on their dorsal surface
  10. 12. A protective plate made of tanned protein that covers the shell aperture when the body is withdrawn into the shell
  11. 13. Material which composes the middle layer of a mollusk shell
  12. 14. A membranous sheath of skin extending from the visceral mass that hangs down on each side of the body, protecting the soft parts
  13. 17. type of circulatory system in which blood is not entirely contained within blood vessels; rather it flows through vessels in some parts of the body and enters open sinuses in other parts
  14. 19. Long, coiled organ used to absorb nutrients from digested food
  15. 24. The term Gastropod means this
  16. 26. The second larval stage of many mollusks; has large, ciliated lobes and the beginnings of a foot, shell, and mantle
  17. 27. Process in which the visceral mass of a gastropod rotates 180 degrees during development
  18. 29. Location of the eyes or eyespots on a snail