COLLETTE and RUSSO: SPANISH MACKERELS 





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FIGURE 22. — Left premaxillae in lateral view. a. Scomberomorus semifasciatus , Port Moresby, New Guinea, 510 mm FL, 

 2 x . b. Scomberomorus lineolatus, Cochin, India, 786 mm FL, 2 x . c. Acanthocybium solandri, Miami, Fla., 1,403 mm FL, 

 1 x . d. Grammatorcynus bilineatus, Marshall Is., 424 mm FL, 2 x . 



merson and S. cavalla also fall into this inter- 

 mediate group with angles of 41°- 54°. Acantho- 

 cybium (Fig. 22c) has a sharp angle (34°-37° ), like 

 S. lineolatus. Grammatorcynus (Fig. 22d) has a 

 very large angle, 64°- 67°, even greater than S. 

 guttatus. The ascending process is longest in S. 

 lineolatus, 46-48% of the length of the premaxilla 

 (41-45% according to Devaraj) and S. sinensis, 

 43-46% . The process is shortest in S. guttatus and 



S. cavalla, 31-32%. Acanthocybium has a longer 

 process than any of the species of Scomberomo- 

 rus, 50% (according to our data and Devaraj 1977). 



Maxilla. — The maxilla (Fig. 23) is a long, 

 curved bone surmounting the premaxilla dorso- 

 lateral^ by means of an anterior head and ven- 

 tral sulcus. The head consists of a thick massive 

 inner condyle and a small lateral process (see S. 



a 



FIGURE 23. — Left maxillae in lateral view. a. Scomberomorus semifasciatus, Port Moresby, New Guinea, 510 mm FL, 2 x . b. Scom- 

 beromorus munroi, New Guinea, 512 mm FL, 2 x . c. Acanthocybium solandri, Miami, Fla., 1,403 mm FL, 1 x . d. Grammatorcynus 

 bilineatus, Timor Sea, 453 mm FL, 2 x . 



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