difference between two super classes of gmathostomata

Dear student,
The correct word is gnathostomata. It includes two clades chondrichthyes and osteichthyes.
Difference between them is given below:-
 

Chondrichthyes	Osteichthyes
Endoskeleton is cartilaginous	Endoskeleton is bony
Internal fertilization	External fertilization
Swim bladder absent	Swim bladder is present

Regards