POTTHOFF: DEVELOPMENT AND STRUCTURE OF FINS IN CORYPHAENA 



and 8. The two pieces of the second distal radial 

 were sometimes partially fused; and in a few rare 

 the second distal radial was one piece of 



cases, 



Table 8. — Adult caudal fin ray counts for 117 Coryphaena 

 hippurus (19.6-172 mm SL) and 97 C. equiselis (19.6-230 mm 

 SL). Symbols: USCR, upper secondary caudal rays; LSCR, 

 lower secondary caudal rays; PCR, principal caudal rays. 



Number of specimens 



Total fin ray count USCR * PCR - LSCR C hippurus C equiselis 



37 

 38 

 39 

 39 

 40 

 40 

 41 

 41 

 42 

 43 

 44 

 45 



10+17-10 

 10+17*11 

 10+17+12 

 11+17+11 

 11+17+12 

 12+17+11 

 11+17+13 

 12+17+12 

 12+17+13 

 13+17+13 

 13*17+14 

 14+17*14 







2 







10 



12 



3 







36 



23 



26 



2 



3 



1 



1 



2 







28 







6 



17 



32 



8 



2 







bone. All following distal radials of the anal fin 

 were two pieces of bone in both species. The 

 posteriormost anal fin ray consisted of two closely 

 approximated rays with one distal radial. 



Caudal Fin 



The two species differed little in ray counts on 

 fully developed caudal fins. Coryphaena hippurus 

 had 38-45 (x = 41.4) caudal rays and C. equiselis 

 had 37-44 (x = 41.1) (Table 8). Coryphaena hip- 

 purus tended to have an equal number of upper 

 and lower secondary caudal rays whereas C 

 equiselis tended to have one or two more lower 

 than upper secondary caudal rays. Adult caudal 

 ray counts for C. hippurus were obtained between 

 15.6 and 19.6 mm SL and for C. equiselis between 

 11.6 and 12.5 mm SL (Tables 9, 10). A procur- 



TaBLE 9. — Caudal fin ray development in 201 Coryphaena hippurus (5.0 mm NL-172 mm SL) and 138 C. equiselis (6.5 mm NL- 

 230 mm SL). Symbols: SCR, secondary caudal rays; PCR, principal caudal rays. 



Length 

 mm NL or SL 



5.5 

 6.5 

 7.5 

 8.5 

 9.5 



4.6- 



5.6- 



6.6- 



7.6- 



8.6- 



96-10.5 

 10.6-11 5 

 11,6-12.5 

 12-6-13.5 

 13.6-14.5 

 14.6-15.5 

 15.6-16.5 

 16.6-17.5 

 17.6-18.5 

 18.6-19.5 

 >19.5 



Coryphaena hippurus 



Coryphaena equiselis 



Table lO. — Length (in millimeters NL or SL) at which parts of the caudal complex first appear in cartilage and then ossify in 

 41 Coryphaena hippurus (5.0 mm NL-110 mm SL) and 39 C. equiselis (6.5-85 mm SL). "First appearance in cartilage" does not pertaiin 

 to all specimens of that size but only indicates a first appearance. Symbol: Pu, preural centrum. 



Part 



Neural spine. PUj 

 Specialized neu- 

 ral arch, PUj 

 Large uroneural 

 Small uroneural 

 Epurals 

 Urostyle 

 Pu J centrum 

 PU3 centrum 

 Haemal spine. PUj 

 Haemal spine, Pu^ 

 Parhypural 

 Hypural 1 

 Hypural 2 

 Hypural 3 

 Hypural 4 

 Hypural 5 



Coryphaena hippurus 



First appearance 

 in cartilage 



First evidence 

 of ossification 



7.4 



7.4 



7.4-8.0 



6.0 



5.0 



<5.0 



<5.0 



<5.0 



<5.0 



6.0 



8.1-9.5 



9.5 



8.0- 



Ossifying in 

 all specimens 



Completely 

 fused 



119 



750- 

 40.0- 



850 

 47.0 



106 



106.0 



Coryphaena equiselis 



First appearance 

 in cartilage 



First evidence 

 of ossification 



Ossifying in 

 all specimens 



> 6.5 but 7.6 



■6.5 but < 7.6 



•6.5but 76 



•:^6.5 



<6.5 

 <6.5 

 <6.5 

 <6.5 

 <6.5 

 65 

 7.6 



7.6 



9.5 

 ■6.5but< 7.6 

 (9.5?) 10.8 

 10.8 

 7.6 

 7.6 

 7.6 

 7.6 

 7.6 

 7.6 

 7.6 

 7.6 

 7.6 

 7.6 

 9.5 



8 1 



9 5 

 7.6 



10.8 

 10.8 

 7.6 

 9.5 

 9,5 

 9.5 

 9.5 

 7.6 

 7,6 

 7.6 

 7.6 

 7.6 

 9.5 



Completely 

 fused 



75.0-800 

 34.0-39.0 



690 



69.0 



295 



