Osteichthyes

Osteichthyes is a vertebrate clade defined by an endoskeleton that is at least partly ossified. It includes ray-finned fishes, lobe-finned fishes, and tetrapods.

Endochondral ossification: Bone formation in which bone tissue replaces a cartilage model. This process forms much of the internal skeleton in many osteichthyans.
Swim bladder: A gas-filled organ that regulates buoyancy in many bony fishes. In many ray-finned fishes, it is a buoyancy organ derived from the foregut.
Guiyu oneiros: An extinct Silurian lobe-finned fish known from fossils in China. Its fossils document early diversity near the base of the osteichthyan radiation.
Teleost: A highly diverse group of ray-finned fishes comprising most living fish species. Teleosts represent the dominant living radiation within Osteichthyes.
Chondrichthyes: The vertebrate clade of cartilaginous fishes, including sharks, rays, and chimaeras. Its members have predominantly cartilaginous skeletons rather than the bony skeleton typical of osteichthyans.
Dermal bone: Bone that develops directly in connective tissue rather than replacing cartilage. Osteichthyans also possess bones formed outside the cartilage skeleton.
Lung: An organ for gas exchange between air and blood. Lungs occur in several osteichthyan lineages and are central to air breathing.
Osteichthyes–Chondrichthyes divergence: The evolutionary split between the lineages of bony vertebrates and cartilaginous fishes. This divergence marks Osteichthyes as distinct from its closest major vertebrate counterpart.
Aquaculture: The farming of aquatic organisms, including fish, for food or other uses. Many farmed fish species are osteichthyans, especially teleosts.
Agnatha: A traditional grouping of jawless vertebrates, including lampreys and hagfishes. Jawless vertebrates fall outside Osteichthyes, though the traditional grouping is not a natural clade.

Linked from 22 pages