i 'r^— ^55»5?-^-Trr-,- 



'•^■^v 



139 



'Mf ' ' ''' 



Fig. 31. - Sexual dimorphism of the anal fin and external genitalia of 

 Tetranematichthys quadrifilis (ANSP 135821). Above: female, 

 ,,^ ' 164 mm SL. Below: nuptial male, 130 mm SL. Gonopore indicated 

 by solid arrow. Scale = 10 mm. 



