Bony Fishes (Osteichthyes)
As their name indicates, the skeleton in this group is made of bone. The group is subdivided into the
ray-finned fishes (Actinopterygii) and
lobe-finned fishes (Sarcopterygii) ...
bony fish A term applied collectively to all groups of fish with bony (as opposed to cartilaginous) skeletons.
Bony fish (class Osteichthyes): The vertebrate Class evolved after jawless and cartilaginous fishes. They have jaws, their skeleton is made up of bone and their body is covered with overlapping scales.
bony fishes Fishes with a skeleton made mostly of bone; they also have gill covers.
Bony fishes depend on color vision to detect both rivals and mates. Sperm and eggs are released into the water, with not much parental care for the newborn. Most fish have fertilization and embryonic development taking place outside the female's body.
(3) Bony fish with lobe fins: And then the fish with real bones came along. No longer was cartilage the skeleton of choice. Bony fish were able to out-compete most of the fish that had cartilage for skeletons.
Osteichthyes, bony fish, are paraphyletic[1] because they include Actinopterygii (ray-finned fish) and Sarcopterygii (lungfish, etc).
Transitions from primitive fish to bony fish
Transition from fishes to first amphibians
Transitions among amphibians
Transition from amphibians to first reptiles
Transitions among reptiles
Transition from reptiles to first mammals (long) ...
This includes the bony fish (Osteichthyes), the cartilaginous fish (Chondrichthyes) such as sharks and rays, and the jawless fish (Agnatha).
Bony fish (teleosts) have an operculum over their gills and they swallow water and force it over their gills and out the operculum. As we said, frogs swallow air.
 See also: Organ, Animal, Animals, Species, Plant
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