POTTHOFF ET AL.: DEVELOPMENT OF SCOMBROID FISHES 



Scombridae — Continued 



Scomberomorini Scomberomorini Sardini Thunnini Istiophoridae Xiphiidae Percichthyidae 



(Scomberomorus) (Acanthocybium) (Sarda) (Thunnus) (Istiophorus) (Xiphias) (Moroney 



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present 

 separate 



present 

 separate 



ossified 



ossifed 



no fusion 



no fusion 



absent 



absent 



absent 



absent 



absent 



absent 



present 



present 



present 



present 



present 



present 



present 



absent 



families and Morone, a primitive perciform fish. 



Sequence of fin and associ- 

 ated pterygiophore develop- 

 ment. 



First anteriormost dorsal and 

 anal pterygiophore develop 

 from one or two pieces of carti- 

 lage. 



Number of initial places of 

 ossification along vertebral 

 column; centra develop from 

 saddle-shaped ossifications at 

 bases of neural and haemal 

 arches. 



1. Second dorsal and anal 

 concurrently. 



2. First dorsal. First dorsal 

 separated from second 

 dorsal during part of devel- 

 opment. 



Dorsal from one piece, anal 

 from two pieces. 



1;Yes 



1 . First dorsal. 



2. Second dorsal and anal 

 concurrently. First dorsal 

 separated from second 

 dorsal during part of devel- 

 opment. 



1 . All dorsal rays and pteryg- 

 iophores dorsoanterior to 

 anal fin. 



2. All dorsal rays and pteryg- 

 iophores opposite future 

 anterior portion of anal fin. 



3. All anal rays and pterygio- 

 phores. 



Dorsal from one piece, anal 

 from two pieces. 



Dorsal and anal from one 

 piece. 



1;Yes 



1;No 



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