A) Eptatretus
B) Myxine
C) Neomyxine
D) Petromyzon
Correct Answer: A
Solution :
[a] Petromyzon (the lamprey) belongs to the section Agnatha of the sub-phylum-Vertebrata. They have long, greenish brown, cylindrical body with smooth scale less, slimy skin, jawless mouth, etc. |
They lay eggs in freshwater but their ammocoete larvae (lower) after metamorphosis return to the ocean. |
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