Guess The Chordates and Fishes

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Across
  1. 4. Fin -situated on either side just behind a fish's head
  2. 9. Finned Fish - class of bony fish that comprise over 50% of living vertebrate species
  3. 10. (shark) - fish belonging to the family Rajidae in the superorder Batoidea of rays
  4. 14. that relies heavily on external heat sources to maintain its body temperature
  5. 15. (heart) - one of the two upper chambers in the heart
  6. 16. Scales -spiny, tooth-like projections found on cartilaginous fish
  7. 19. Fin- a flat, thin body part that extends from the back of many marine and freshwater vertebrates
Down
  1. 1. - a stiff structure resembling a lid or a small door that opens and closes
  2. 2. - one of two large chambers located toward the bottom of the heart
  3. 3. Squirt- commonly known as the ascidians
  4. 5. ( shark) -also known as the bowmouth guitarfish
  5. 6. Line System - a sensory system in fish and some amphibians that helps them detect movement
  6. 7. living animals that have a skull but no vertebral column
  7. 8. a cartilaginous skeletal rod supporting the body
  8. 11. - serves as the opening for the digestive, reproductive tracts of many animals
  9. 12. Bladder- internal gas-filled organ that contributes to the ability of many bony fish
  10. 13. Finned Fish - sometimes considered synonymous with Crossopterygii
  11. 17. group of jawless fish comprising the order Petromyzontiformes
  12. 18. fin -located at the end of a fish