The chondrosteans are one group of the most primitive of the ray-finned fishes.

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Chondrosteans are a group of ray-finned fishes that are considered to be among the most primitive. They are characterized by their cartilaginous skeletons and a heterocercal tail (a tail in which the upper lobe is longer than the lower), which is a feature they share with many of their closest relatives, the cartilaginous fishes (sharks, rays, and chimaeras).

The Chondrosteans Are One Group of the Most Primitive of the Ray-Finned