NEET BIOLOGY

Detailed explanation-1: -Chondrichthyes is a class of jawed fishes having a cartilaginous skeleton. The class includes a diverse group of fishes including sharks, rays, skates and chimaeras. They are mostly marine fishes. The other group of fishes are bony fishes, which are included in the class Osteichthyes.

Detailed explanation-2: -chondrichthyan, (class Chondrichthyes), also called chondrichthian, any member of the diverse group of cartilaginous fishes that includes the sharks, skates, rays, and chimaeras.

Detailed explanation-3: -Cartilaginous fishes (phylum Chordata, subphylum Vertebrata, class Chondrichthyes) are vertebrates (animals with a backbone and a hollow tube of nervous tissue called a spinal cord) characterised by having a skeleton made up of cartilage instead of bones.

Detailed explanation-4: -Phylum Chordata, Class Chondrichthyes (sharks, rays and skates, chimaeras) Chondrichthyes are jawed fish with skeletons made of cartilage rather than bone.

Detailed explanation-5: -Cartilaginous fishes (chondrichthyes) represent the oldest surviving jawed vertebrates and, as the name suggests, have a skeleton made out of cartilage. They include sharks, rays, and skates (elasmobranchii) and chimeras (holocephali).