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?
- A
Scoliodon sp.
- B
Petromyzon sp.
- C
Exocoetus sp.
- D
Branchiostoma sp.
Petromyzon (lamprey) is a cyclostome with a cartilaginous endoskeleton, a circular sucking mouth, ectoparasitic habit on fishes, no paired fins or scales, and 6–15 pairs of gill slits.
Scoliodon is a cartilaginous fish but not parasitic, and Exocoetus is a bony flying fish; neither matches the description.
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