Which class includes bony fish?

Which class includes bony fish?

• A. Chondrichthyes
• B. Amphibia
• C. Agnatha
• D. Osteichthyes

Answer: (D)

Bony fish have a skeleton made of bone rather than cartilage. In vertebrate classification, fish are grouped by the material of their skeleton, and the group that uses bone is Osteichthyes. This includes the vast majority of fish, such as goldfish, salmon, and tuna, and encompasses both ray-finned and lobe-finned lineages. In contrast, chondrichthyes are cartilaginous fishes like sharks and rays, agnatha are jawless fishes such as lampreys, and amphibia are not fish at all but tetrapods that typically live on land or in water during life. Therefore, the class that includes bony fish is Osteichthyes.

Bony fish have a skeleton made of bone rather than cartilage. In vertebrate classification, fish are grouped by the material of their skeleton, and the group that uses bone is Osteichthyes. This includes the vast majority of fish, such as goldfish, salmon, and tuna, and encompasses both ray-finned and lobe-finned lineages. In contrast, chondrichthyes are cartilaginous fishes like sharks and rays, agnatha are jawless fishes such as lampreys, and amphibia are not fish at all but tetrapods that typically live on land or in water during life. Therefore, the class that includes bony fish is Osteichthyes.