COLLETTE and RUSSO: SPANISH MACKERELS 



All the species of Scomberomorus and Gramma- 

 torcynus have a notch on the anteroventral mar- 

 gin of the dentary. This notch is absent in Acan- 

 thocybium. The notch seems to vary as much 

 between specimens of a species of Scomberomo- 

 rus as between species of the genus. Acanthocyb- 

 ium has a prominent notch on the anterior mar- 

 gin of the dentary (Fig. 24b) which is indistinct or 

 absent in Scomberomorus and Grammatorcynus. 



Devaraj (1977) stated that the anterior notch was 

 distinct in S. cavalla and S. commerson. The 

 notch may be a little more prominent in S. 

 commerson than in the other species, but we 

 cannot confirm this for S. cavalla. 



Angular. — The triangular anterior end of the 

 angular (frequently called articular) fits into the 

 dentary anteriorly (Fig. 25). The posterior end of 



ANGULAR 



RETROARTICULAR 



FIGURE 25. — Left angulars and retroarticulars in lateral view. a. Scomberomorus semifasciatus, Port 

 Moresby, New Guinea, 510 mm FL, 3.5x. b. Acanthocybium solandri, Miami, Fla., 1,403 mm FL, lx. 

 c. Grammatorcynus bilineatus, New Guinea, 382 mm FL, 4.5 x. 



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