Fig. 20: Nasal openings of (A) 

 Phoxinus phoxinus (ZFMK, 

 Series b, 80.5 mm SL), and 

 (B) P. erythrogaster (KU 

 10629, 62.2 mm SL). Scale 

 bars = 60 urn. 



elongated, reaching middle of the organ, and the primary lamellae increase to eight by 

 51.8 mm standard length (Fig. 2 IE). As a rule, the number of the primary lamellae in- 

 creases ontogenetically until adult size is reached (Tab.l; Chen 1988b, Chen & Arratia 

 1994). 



