Fishes

Review Questions

Members of Chondrichthyes differ from members of Osteichthyes by having (a) ________.

  1. jaw
  2. bony skeleton
  3. cartilaginous skeleton
  4. two sets of paired fins

Hint:

C

Members of Chondrichthyes are thought to be descended from fishes that had ________.

  1. a cartilaginous skeleton
  2. a bony skeleton
  3. mucus glands
  4. slime glands

Hint:

B

A marine biologist catches a species of fish she has never seen before. Upon examination, she determines that the species has a predominantly cartilaginous skeleton and a swim bladder. If its pectoral fins are not fused with its head, to which category of fish does the specimen belong?

  1. Rays
  2. Osteichthyes
  3. Sharks
  4. Hagfish

Hint:

B