Question

Cartilaginous fishes are grouped under ______.

Answer 1

Cartilaginous fishes:

1. They are the oldest living jawed vertebrates.
2. Like their name, their skeleton is composed of cartilage.
3. Sharks, Rays, Skates, and Chimeras are examples of cartilaginous fishes.

Chondrichthyes:

1. It comprises those fishes that are mostly non-bony and cartilaginous.
2. The main characteristics of these fishes are that their skin is covered by placoid scales.
3. Other characters are the structure of their fin rays.
4. Bony operculum, lungs, and swim bladder are absent.

Final answer: Cartilaginous fish are grouped under Chondrichthyes.