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Question

A group of researchers procured some fish like animals and upon investigation the following characters were observed:

A. Endoskeleton was made of cartilage.

B. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth.

C. Paired fins and scales were absent, but 7 pairs of gill slits were present.

Which of the following species of animals did they consider to fit best with these characters?

Options

A.Scoliodon sp.
B.Petromyzon sp.
C.Exocoetus sp.
D.Branchiostoma $sp$.

Solution

Sol. [Key Concept: Diagnostic features of the fish-like animal]

Petromyzon sp. has cartilaginous endoskeleton. They have circular sucking mouth. They are ectoparasites on some fishes. Their body is devoid of scales and paired fins. They have 7 pairs (6-15 pairs) of gill slits.

Scoliodon and Exocoetus are not parasites.

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