Collette and Gillis. Osteological differences between two species of Grammatorcynus 



25 



'0mv^ 



Figure 1 1 



Left premaxillae in lateral view, (a.) Scomberomorus lineolatus, Cochin, India, 786mm FL, 2x; (b) Acanthocybium solandri, 

 Miami, FL, 1403mm FL, 1 x ; (c) Grammatorcynus bilineatus, Marshall Is., 424mm FL, 2 x ; (d) G. bicarinatus, Great Barrier 

 Reef, 563mm FL. 



a 



Figure 12 



Left maxillae in lateral view, (a) Scomber<ynwrus munroi, New Guinea, 512 mm FL, 2 x ; (b) Acanthocybium solandri, Miami, FL, 1403 mm 

 FL, Ix; (c) Grammatorcynus bilineatus. Timor Sea, 453mm FL, 2x; (d) G. bicarinatus, Great Barrier Reef, 563mm FL. 



ilia. This is a small percentage relative to Acantho- 

 cybium (50%, Fig. lib). ScomberoTnorus is intermediate 

 (31-48%, Fig. 11a). 



Maxilla The maxilla (Fig. 12) is a long, curved 

 bone surmounting the premaxilla dorsolaterally by 



means of an anterior head and ventral sulcus. The head 

 consists of a thick, massive inner condyle and a small 

 lateral process. The inner condyle possesses a promi- 

 nent knob at its dorsolateral aspect that fits into the 

 articular surface of the vomer, and an anterior, deep 



