Definition

Noun: A class of fish (Chondrichthyes) whose internal skeleton is primarily composed of cartilage, which may be hardened by calcium deposits (calcified) but does not form true bone (ossified). This group includes sharks, rays, skates, and chimaeras.

Usage

The term is used in biological and zoological contexts to classify and describe this major group of aquatic vertebrates. - The museum's exhibit featured several species of cartilaginous fish, including a great white shark model. - Unlike bony fish, cartilaginous fish do not have swim bladders to control their buoyancy.

Advanced Usage

• In scientific taxonomy: The term precisely distinguishes Chondrichthyes from Osteichthyes (bony fish) and Agnatha (jawless fish).
  • The evolutionary history of cartilaginous fish is a key area of research in marine biology.

Variants and Related Words

• Chondrichthyes (n): The scientific class name for cartilaginous fish.
• Elasmobranch (n): A subclass of cartilaginous fish that includes sharks, rays, and skates.
• Chimaera (n): A member of the other subclass (Holocephali) of cartilaginous fish, also known as ghost sharks or ratfish.

Synonyms

• Chondrichthyan (n): A direct synonym, often used in technical writing.
• Shark/ray family (n): Informal, non-scientific terms referring to common members of this group.

Related Phrases

• Cartilaginous skeleton: The defining physical characteristic of these fish.
  • The cartilaginous skeleton is lighter and more flexible than bone.

Noun

1. fishes in which the skeleton may be calcified but not ossified