Sharks have no bones. They have an internal skeleton composed of cartilage, a lightweight material. The upper jaw is not attached to their skull. Teleost has an internal skeleton composed of calcified bones. The upper jaw is connected to the skull.
Jawless fish have no ribs whereas most advanced fish have two sets of rib for each centrum, the dorsal and the ventral ribs. The ventral ribs are located next to the coelomic cavity and the dorsal ribs lie in the myosepta between the epaxial and hypaxial muscles.
Tetrapod has bicipital ribs. The ventral ribs are lost and the dorsal ribs become the trunk ribs. Tetrapod’s ribs usually articulate with the vertebrae in moveable joints, known as capitulum and tuberculum. The ribs in a tetrapod are essential
Jawless fish have no ribs whereas most advanced fish have two sets of rib for each centrum, the dorsal and the ventral ribs. The ventral ribs are located next to the coelomic cavity and the dorsal ribs lie in the myosepta between the epaxial and hypaxial muscles.
Tetrapod has bicipital ribs. The ventral ribs are lost and the dorsal ribs become the trunk ribs. Tetrapod’s ribs usually articulate with the vertebrae in moveable joints, known as capitulum and tuberculum. The ribs in a tetrapod are essential