Fish are a complex group of animals that are not all simply lumped into once class. There are four basic groups; Bony Fish, Lobe finned fish, Cartelagenous fish and jawless fish, but they are all separate classes, all they have in common is the fact that they are in the phylum Chordata. This strange system stems from the fact that the word fish is a common name for swimming animals that have a certain look to them, but doesnt nessesarily represent any real genetic similarities.
Bony fish belong to the Class Sarcopterygii (if lobe-finned) and the Class Actinopterygii (if ray-finned). Coelacanths and lungfish are lobefinned and about all other bony fish are ray-finned. The two classes used to be combined as Class Osteichthyes. There are many superorders and orders in the bony fish classes.
Sharks belong to cartilaginous fish. (Chondrichthyes)
Sturgeon belongs to the class Actinopterygii, which includes ray-finned fish.
Jawless fish are the oldest group of fish, belonging to the class Agnatha. Within this class, they are further divided into two orders: the Petromyzontiformes (lampreys) and the Myxiniformes (hagfish).
Jawless fish belong to the class Agnatha within the phylum Chordata. They are primitive fish lacking jaws, and include groups like lampreys and hagfish.
A Sturgeon fish is class Actinopterygii or a ray-finned fish. A lobe finned fish is a class Sarcopterygii.
"Flying fish" are a family of fish of Class Actinopterygii, Order Beloniformes, Family Exocoetidae
Chondrichthyes is the Class of fish that has Cartilage Rather than bone.
The class pieces
Starfish are echinoderms of the class Asteridea not fish.
I have just been learning about the phylum 'Chordata' in class. Most fish are in the class called 'Fish'. Pretty simple, and i hope you find this useful!
school
school
The Bony Fish
Most of the fish belong to the class called class Chrodata. Examples of this type of fish include tilapia, Nile perch and the cat fish.
The Betta splendens is in the Class "Actinopterygii"
They are members of cartilaginous class of fish.