48 
Fishery Bulletin 108(1) 
Spotfin tonguefish ( Symphurus oligomerus ): (A) preflexion larva (2.5 mm notochord length, NL); 
(B) preflexion larva (3.4 mm NL); and (C) flexion larva (7.8 mm body length) showing two internal 
cartilaginous struts (ICS). Morphometric measurements are HL=head length; BL=body length; 
CRL = caudal region length; SAL = snout-anus length; LIL=loop intestinal length; APL = abdominal 
projection length; CAL = conical appendix length; ED = eye diameter; BD=body depth at pelvic fin 
base; BDA=body depth at anus. Drawings by R. Saldierna. 
