FISHERY BULLETIN: VOL. 73, NO. 3 



f 



Figure 59.— Left supratemporals of six species of Sardini, ex- 

 ternal lateral view. a. Cybiosarda ekgans, New South Wales, 365 

 mm FL. b. Orcynopsis unicolor, Tunisia, 503 mm FL. c. Sarda 

 sarda, New Jersey, 375 mm FL. d. Sarda chiliensis, Peru, 473 

 mm FL. e. Gymnosarda unicolor, Truk Islands, 607 mm FL. f. 

 Allothunnus fallal, Tasmania, 778 mm FL. 



supratemporal bones in all bonitos. Orcynopsis, 

 Cybiosarda, and Gymnosarda have a shorter 

 posterior body than do Sarda and Allothunnus. 

 The thin edges of the supratemporal vary slightly 

 among species of Sarda (Figure 59) and within 

 each species of bonito. Allothunnus has the most 

 elongate posterior body. 



Supracleithrum 



The supracleithrum lies in between the post- 

 temporal and the cleithrum. Cybiosarda, Or- 

 cynopsis, and Sarda have relatively narrow and 

 elongate supracleithra compared to Gymnosarda 

 and Allothunnus. A dorsally projecting process is 

 set off from the main body of the supracleithrum 

 by a notch or angle on the anterodorsal part of the 

 outer surface of the bone. Sarda australis and 

 Allothunnus have the notch almost right-angled 

 (Figure 60f , h). The other species of Sarda have a 

 more poorly developed notch with a wider angle. 



584 



Figure 60.-Left supracleithra of eight species of Sardini, ex- 

 ternal view. a. Cybiosarda elegans. New South Wales, 355 mm 

 FL. b. Orcynopsis unicolor, Tunisia, 645 mm FL. c. Sarda 

 chiliensis, Callao, Peru, 549 mm FL. d. Sarda orientalis, 

 Panama, 415 mm FL. e. Sarda sarda, Tunisia, 504 mm FL. f. 

 Sarda australis. New South Wales, 495 mm FL. g. Gymnosarda 

 unicolor, Amirante Islands, 713 mm FL. h. Allothunnus fallai, 

 California, 680 mm FL. a drawn twice as large as other figures. 



I 



