Osteichthyes
…28,000 species. The group is divided into two main clades, the ray-finned fish (Actinopterygii, which makes up the vast majority of extant fish) and the lobe-finned fish (Sarcopterygii, which gave rise to all land vertebrates). The oldest known fossils of bony fish are about 436 million years old from the early Silurian…