COLLETTE and RUSSO: SPANISH MACKERELS 



omorus. No other scombrid has such a spatulate 

 anterior extension of the vomer. In fact, the 

 vomer is either not visible in dorsal view or 

 protrudes anteriorly slightly beyond the ethmoid 

 in other scombrid genera. 



Nasal. — The nasal bones (Fig. 20) are flat, 

 roughly triangular bones with thickened lateral 

 edges. The mesial edges are irregular and almost 

 serrate in some species to form a firm immovable 

 articulation with the lateral edge of the frontals. 



PTEROSPHENOID 



LATERAL ETHMOID 



ETHMOID 



VOMER 



FRONTAL 



PROOTIC > PTEROTIC 



TERCALAR 



PARASPHENOID 



SPHENOTIC 



a 



BASIOCCIPITAL 



FIRST VERTEBRA 



EXOCCIPITAL 



FIGURE 17. — Skulls in ventral view. a. Scomberomorus commerson, Coffs Harbour, New South Wales, 1,155 mm FL. b. Scom- 



beromorus munroi, Cairns, Queensland, 800 mm FL, USNM 219372, paratype. 



567 



