POTTHOFF: DEVELOPMENT AND STRUCTURE OF FINS IN CORYPHAENA 



Figure 14. — Second anteriormost dorsal fin pterygiophore with 

 secondarily and serially associated rays from a 230 mm SL 

 Coryphaena equiselis. Left: anterodorsal view, secondarily asso- 

 ciated ray has been moved to right of proximal radial; right: left 

 lateral view, secondarily associated ray has been moved dorsally. 

 For explanation of symbols, see Figure 7. 



1.0 mm 



For Trachurus symmetricus, Ahlstrom and Ball 

 (1954) reported an anterior to posterior anal fin 

 development. 



Anal Fin Pter^giophores 



Q)unts 



The description for dorsal fin pterygiophores 

 in the foregoing section may be applied to anal 

 fin pterygiophores because of the similarities 

 between the two fins and their supports. Pterygio- 

 phores of the anal fin are inserted in the in- 

 terhaemal spaces. The anteriormost (first) in- 



terhaemal space is bounded anteriorly by the 

 stomach, intestine, and anus and posteriorly by 

 the first haemal spine. The first haemal spine was 

 of variable length, and in many cases did not reach 

 the anal fin pterygiophores. The anal fin pterygio- 

 phores in the two anteriormost interhaemal spaces 

 were therefore summed (Table 5, Figure 3). 



Fully developed specimens of Coryphaena spp. 

 differed in their numbers and arrangement of anal 

 fin pterygiophores. The total number of pterygio- 

 phores closely approximated the anal fin ray 

 count. For both species the pterygiophore count 

 was equal to or one to two less than the anal fin ray 

 count. The sum of the pterygiophores found in the 



291 



