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  •  A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after  metamorphosis return to 

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

Option: 1

Myxine


Option: 2

Neomyxine


Option: 3

Petromyzon


Option: 4

Eptatretus


Answers (1)

best_answer

 

 

Class Cyclostomata - Characteristics Features -

  • This class includes the most primitive vertebrates, the lampreys and hagfishes.
  • Hagfishes are scavengers and lampreys are ectoparasite.
  • They have a sharp, circular jawless mouth with horny teeth.
  • They have a slender eel-like body.
  • They do not have paired fins.
  • The cranium and vertebral column are made up of cartilage.
  • They have closed circulatory system with two-chambered heart.
     

-

 

 

 Petromyzon (the lamprey) belongs to the section Agnatha of the subphylum­Vertebrata.  They lay eggs in freshwater but their ammocoete larvae (lower) after metamorphosis return to  the ocean.

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