Phylum Mollusca Vocabulary

12345678910
Across
  1. 5. A respiratory organ used to extract dissolved oxygen from water and, in some mollusks, to filter food particles.
  2. 6. A respiratory structure that extracts oxygen from water; in bivalves, it also helps filter food.
  3. 7. The concentration of sense organs and nerve cells at the anterior (front) end of the body, essentially forming a head.
  4. 8. A specialized layer of tissue that covers the internal organs and, in many species, secretes the calcium carbonate used to create a shell.
  5. 9. A tube-like structure through which water enters or leaves the body, used for breathing, feeding, or "jet propulsion" movement.
  6. 10. A group of highly intelligent, "head-footed" marine mollusks with tentacles, such as squids, octopuses, and nautiluses.
Down
  1. 1. A flexible, tongue-like organ covered in tiny teeth that mollusks use to scrape, tear, or drill for food.
  2. 2. A type of body plan where the right and left sides are mirror images of each other.
  3. 3. A class of mollusks (like snails and slugs) typically characterized by a single shell or no shell and a large, muscular "stomach-foot."
  4. 4. A group of aquatic mollusks, such as clams and oysters, that have a compressed body enclosed within a hinged, two-part shell.
  5. 9. The hard, protective outer layer of many mollusks, often made of calcium carbonate.