Collette and Gillis: Osteological differences between two species of Orammatorcynus 



41 



Figure 24 



Left second postcleithra in lateral view, (a) Scomheromorus 

 queenslandieus, Great Barrier Reef, 641 mm FL, 1 x ; (b) S. 

 koreanus, Indonesia, 480mm FL, L5x; {c) Acanthocybium 

 solandri, Revillagigedos Is.. 1068mm FL, Ix; (d) Gram- 

 matorcynus bilineatus, Queensland, 382 mm FL, 2 x . 



Grammatorcynus differs from most other 

 scombrids in having a single fleshy interpelvic 

 process. Auxis and Gymnosarda also have a 

 single interpelvic process; very large in the 

 former, moderate-sized in the latter. 



Part 2: Systematics and biology 



Grammatorcynus Gill 1862 



Grammatorcynus Gill 1862: 125 (original 

 description; type-species Thynnus biline- 

 atus Riippell 1836 by original designation). 



Nesogrammu^ Evermann and Seale 1907: 61 

 (original description; type-species Neso- 

 gramm.us piersoni Evermann and Seale 

 1907 by original designation, = Gram- 

 matorcynus bilineatus). 



Figure 25 (below) 



Right basipterygia of the pelvic girdle in mesial view, (a) 

 Scomheromorus regalis, Miami, FL, 469 mm FL, 1.5 x; (b) 

 S. lineolatus, Palk Strait, India, 428mm FL, 2x; {c)Acan- 

 ttiocybium solandri, Miami, FL, 1403 mm FL, 1 x ; (d) Gram- 

 maiorcynus bilineatus, Queensland, 521mm FL, 1.5 x. 



anterodorsal plate 



posterior process 



anterior process 



