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

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)


As we learnt in

Class Cyclostomata -

All are ectoparasites on some fishes. Mouth is circular and jawless. Head and brain poorly developed.

- wherein

Eg. Petromyzon, Myxine.



Petromyzon(the lamprey) belongs to the section Agnatha of the sub-phylum-Vertebrata. They have long, greenish brown, cylindrical body with smooth scaleless, slimy skin, jawless mouth, etc. They lay eggs in freshwater but their ammocoete larvae(lower) after metamorphosis return to the ocean.


Posted by

Irshad Anwar

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