Osteichthyes //, also called bony fish, are a taxonomic groop o fish that hae bone, as opponed tae cartilaginous, skeletons. The vast majority o fish are osteichthyes, which is an extremely diverse an abundant groop consistin o 45 orders, an ower 435 faimilies an 28,000 species. It is the lairgest class o vertebrates in existence the day. Osteichthyes is dividit intae the ray-finned fish (Actinopterygii) an lobe-finned fish (Sarcopterygii). The auldest kent fossils o bony fish are aboot 420 million years ago, which are an aa transeetional fossils, shawin a tuith pattern that is in atween the tuith rows o sharks an bony fishes.