Mollusca Terminology

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Across
  1. 3. This structure (style) is used in concert with a gastric shield in a “mortar & pestle” digestive method
  2. 4. These cells control cephalopods’ ability to alter the way light hits them
  3. 6. This type of gill structure is considered more primitive, and relies on a 3 chambered heart (water in 2 ways and out 1)
  4. 10. Indigestible grit excreted by filter feeding bivalves
  5. 14. Bivalves do not exhibit a clear “head”, the process that normally forms the head structure is called _____
  6. 15. Paired chemosensory organs in molluscs
  7. 17. Gland in Lamellibranch bivalves that produces a “beard” of threads to help anchor them to a substrate
  8. 18. Most common type of reproduction conducted by molluscs
  9. 19. This class is often found in deep benthic water
  10. 21. Ectoparasitic larvae of some freshwater mussels
  11. 23. Siphuncle, chromatophores, and iridocytes are all structures in what class
  12. 24. This member of the class Cephalopoda has an internal chambered shell
  13. 26. The external, feathery gills developed by Opisthobranchs
  14. 28. Aplacaphora has ________ in place of a shell
  15. 29. Free-swimming mollusc larvae with ciliated velum
  16. 30. The lateral folds of the foot that Opisthobranchs have used to modify that muscle
  17. 32. A specialized morphological feature in Protobranchia that aids them in deposit feeding
  18. 33. Means that the individual has a left-coiled shell
  19. 34. These cells control cephalopods’ color-changing ability
  20. 35. The function of the radula that is different for aplacophorans
  21. 36. Formed from muscular wavy muscles, used for locomotion in some clades
  22. 37. A set of light and dark colored bands of muscle fibers that relax and contract, aid in locomotion
  23. 40. The name of the protinacious shield that many gastropods have on their foot
Down
  1. 1. Type of flow (exchange) used to maximize flow of oxygen into the blood
  2. 2. The only member of cephalopoda that still has an external shell
  3. 5. Opisthobranchs use _____ for chemosensory purposes
  4. 7. Their shell forms as a series of 7 to 8 plates
  5. 8. Formal term for the synapomorphic structure used for gas exchange
  6. 9. Bioluminescent cells
  7. 11. Excretory system in molluscs
  8. 12. Structure in cephalopods that was modified from foot
  9. 13. Toothed, tongue-like organ used for rasping at food
  10. 16. This class has a tusk-like, conical shell that is open at both ends
  11. 20. Feeding tentacles of Scaphopods/Tusk Shells
  12. 22. Secretes calcareous compounds for structural and defensive use
  13. 25. Specialized arm for reproduction possessed by some male cephalopods
  14. 26. Basal to molluscs, yet reduced in all extant taxa
  15. 27. Fleshy skirt on chitons
  16. 31. Respiratory opening of pulmonate gastropods
  17. 38. Aplachophoran body plan
  18. 39. This large blood sinus is sometimes used in locomotion