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What type of teeth do these animals have?

Options

  1. ASharp teeth
  2. BModified placoid scales that are backwardly directed
  3. CNo teeth
  4. DFlat teeth

Correct answer

B. Modified placoid scales that are backwardly directed

Step-by-step solution

All living members of the class Cyclostomata are ectoparasites on some fishes.Cyclostomes have a sucking and circular mouth without jaws. Cyclostomes have an elongated body bearing 6-15 pairs of gill slits for respiration. Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean. After spawning, within a few days, Cyclostomes die. The mouth is located ventrally on these animals.The skin is tough, containing mi

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