Question

What is the major difference between Hippocampus and Trygon?

• A. Hippocampus lived in sea water while Trygon in fresh water
• B. Trygon swims continuously, whereas Hippocampus does not
• C. Hippocampus is an Osteichthyes fish, while Trygon is a Chondrichthyes fish
• D. B & C both correct

Hint:

Remember: \[ \boxed{\text{Hippocampus} \rightarrow \text{Osteichthyes (Bony fish)}} \] \[ \boxed{\text{Trygon} \rightarrow \text{Chondrichthyes (Cartilaginous fish)}} \] Bony fishes possess a swim bladder, whereas cartilaginous fishes do not.

Answer 1

The Correct Option is D

Hippocampus (seahorse) belongs to class Osteichthyes and possesses a bony endoskeleton, while Trygon (stingray) belongs to class Chondrichthyes and has a cartilaginous skeleton. This fundamental difference in skeletal composition is the major distinction between them despite both being aquatic vertebrates.