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Cartilaginous Fishes
Cartilaginous fish.
They are members of cartilaginous class of fish.
They are members of cartilaginous class of fish.
Both jawless fish and cartilaginous fish have skeletons composed of cartilage and distinct brains. Also, some cartilaginous fish don't have scales, and all jawless fish don't have scales. Cartilaginous fish, however, have jaws, paired appendages, and a kind of vertebrae. Jawless fish do not have jaws, paired appendages, and often are without vertebrae.
they are vertibrates
bones
Bony fishHag fishLamprey(both of these are known as the jawless fish)Sharks and rays(both of these are known as cartilaginous fish)Lob-finned fishThis is a very simplified classification of something that is very complex. To see the full tree, try WikiSpieces.
they all have an inter skeleton, not an exoskeleton. most reptiles have hard scales on the outside, not bone.
jawless fishes
Ascarids don't have skeletons.
micefish!!