COLLETTE and CHAO: SYSTEMATICS AND MORPHOLOGY OF THE BONITOS (SARDINI) 



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Figure 64.-Left first postcleithra of six species of Sardini. a. 

 Cybiosarda elegans, New South Wales, 360 mm FL. b. Orcynop- 

 sis unicolor, Tunisia, 645 mm FL. c. Sarda australis, New South 

 Wales, 407 mm FL. d. Sarda sarda, Tunisia, 504 mm FL. e. 

 Gymnosarda unicolor, Truk Islands, 774 mm FL. f. Allothunnus 

 fallai, California, 680 mm FL. 



and broader in the midanterior portion. Tiie por- 

 tion above the internal wing is even better 

 developed in Allothunnus than in Thunnus (de 

 Sylva 1955, fig. 51). The internal and external 

 wings of Allothunnus are less prominent than in 

 the other bonitos. Among the species of Sarda, S. 

 orientalis has a narrower and longer vertical wing. 



Figure 65.— Left second postcleithra of six species of Sardini, 

 external lateral view. a. Cybiosarda elegans. New South Wales, 

 355 mm FL. b. Orcynopsis unicolor, Tunisia, 545 mm FL. c. 

 Sarda sarda, New Jersey, 375 mm FL. d. Sarda orientalis, 

 Jalisco, Mexico, 434 mm FL. e. Gymnosarda unicolor, Truk 

 Islands, 607 mm FL. f. Allothunnus fallai, California, 680 mm 

 FL. 



The anterior process of the basipterygium extends 

 anteriorly to about the middle of the anterodorsal 

 plate. The posterior styliform process is shorter 

 and stronger than the anterior process in the 

 bonitos. Except for Gymnosarda, no differences 

 were found among the bonitos in the fleshy bifid 

 interpelvic process that is supported by the paired 

 posterior styliform process of the basipterygia 



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