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A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is:

  1. A
    Petromyzon
  2. B
    Eptatretus
  3. C
    Myxine
  4. D
    Neomyxine

Solution & Step-by-step Explanation

Petromyzon (Lamprey) is a jawless vertebrate that is anadromous—it lives in the ocean but migrates to freshwater to spawn. Its larvae (ammocoetes) undergo metamorphosis before returning to the sea.

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A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is:
A
Petromyzon
B
Eptatretus
C
Myxine
D
Neomyxine

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