POTTHOFF: DEVELOPMENT AND STRUCTURE OF FINS IN CORYPHAENA 



Table 3. — Adult and juvenile position of posteriormost dorsal 

 and anal fin pterygiophores in their intemeural and inter- 

 haemal spaces for 193 Coryphaena hippurus (9.0-176 mm SL) 

 and 186 C. equiselis 18.9-172, 314 mm SL). For numbering of 

 vertebrae and spaces, see Figure 3, 



Intemeural space numbers 

 Interhaemal space numbers 



28 28 29 29 

 28 29 28 29 



172 



without rays were first seen in the 22d-24th 

 myomeres at 5.9 mm NL in C. hippurus (Figure 2) 

 and with some rays in the 18th-27th myomeres at 

 6.5 mm NL in the smallest available but more 

 advanced C. equiselis. In both species of Cory- 

 phaena the pterygiophores appeared shortly be- 

 fore the fin rays developed. As pterygiophores 

 were added, anteriorly and posteriorly rays were 

 lacking for one or two anteriormost and posterior- 

 most additions (Figure 2). 



In both species, the posteriormost intemeural 

 spaces (numbers 26-28) were occupied with ptery- 

 giophores between 7 and 8.5 mm SL (Table 4). The 

 anteriormost intemeural space started to fill with 

 pterygiophores at 9.3 mm SL in C. equiselis and at 

 13.1 mm SL in C. hippurus (Figure 4, Table 4). 

 Adult counts in the anteriormost intemeural 

 space of 7-11 pterygiophores were obtained for C. 

 equiselis between 12.3 and 23.2 mm SL and for C. 

 hippurus of 10-14 pterygiophores between 18.7 

 and 30.8 mm SL (Figure 4, Table 4). 



Ossification of the pterygiophores started in the 

 same area and proceeded in the same directions as 

 the cartilaginous development (Figure 2). Ossifi- 

 cation of pterygiophores occurred first at 8.8 mm 

 SL in C. equiselis and at 9.7 mm SL in C. hippurus 

 (Table 4). The posteriormost intemeural space 

 number 28 of C. equiselis had ossifying pterygio- 

 phores at 8.9 mm SL, and posteriormost inter- 

 neural space number 26 of C. hippurus had 

 ossifying pterygiophores at 10.2 mm SL (Table 4). 

 Specimens 10.3-11.6 mm SL of C. equiselis, and 

 16.2-19.2 mm SL specimens of C. hippurus had one 

 or more ossifying pterygiophores in the first inter- 

 neural space (Figure 4, Table 5). All dorsal fin 

 pterygiophores were ossifying in both species at 

 about 45 mm SL when the count of ossifying 

 pterygiophores was in the adult range and the 

 first intemeural space did not have anterior 

 cartilaginous pterygiophores (Figures 4, 5). 



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