Other other major characters of gnathostomes:
intrinsic eye muscles attached to lens
sperm ducts linked to urinary system
spiral valve in intestine (lost in more ěadvancedî gnathostomes)
large, distinct cerebellum
a whole bunch more, which can be viewed conveniently on p. 178 (Table 6.2) of your textbook, because I donít feel like typing them all out. So nyah.