FISHERY BULLETIN: VOL. 82, NO. 4 



CERATOHYAL 



EPIHYAL 



HYPOHYALS 



a 



BRANCHIOSTEGAL RAYS 



HYOIDEAN GROOVE 



FIGURE 29. — Left hyoid complexes in lateral view. a. Scomberomorus commerson, New South Wales, 1,155 mm 

 FL,lx . b. Acanthocybium solandri, Miami, Fla., 1,403 mmFL, lx. c. Gramrnatorcynus bilineatus, Timor Sea, 

 453 mm FL, 2 x . 



guttatus, koreanus, lineolatus, and regalis. Both 

 large (S. commerson) and small (S. multiradia- 

 tus ) species have slits. Smaller specimens of a 

 species sometimes have slits (guttatus, pluriline- 

 atus, queenslandicus , regalis, and semifasciatus), 

 while larger specimens lack them; sometimes the 

 situation is reversed (koreanus, lineolatus, and 

 tritor). The dorsal margin of the ceratohyal is 



deeply concave and very much constricted in 

 Acanthocybium such that the dorsal margin of 

 the bone comes closer to the groove for the hy- 

 oidean artery. The margin is straight in Gramrna- 

 torcynus and varies in Scomberomorus. Devaraj 

 (1977:30-31) stated that the dorsal margin of the 

 ceratohyal is convex in some species (koreanus 

 and lineolatus), almost straight in others (gut- 



586 



