TUCKER: LARVAL DEVELOPMENT OF CITHAKICHTHYS AND ETROPUS 



Table 6.— Measurements (mm) of larvae of Citharickthys gymnorhinus. Pref = preflexion, ECF = early 

 caudal formation, Early = early flexion, Mid = midflexion, Late = late flexion, Post = postflexion. S = sym- 

 metrical, 1 = to one-third of the way to the dorsal ridge, 2 = one-third to two-thirds of the way to the dorsal 

 ridge, 3 = two-thirds to all the way to the dorsal ridge. 



'Measurement does not include dorsal or anal pterygiophores 



mens in each stage are as follows: Preflexion, 4.5- 

 5.4 mm NL; early caudal formation, 4.4-5.3 mm 

 NL; early flexion, 5.3-6.0 mm NL; midflexion, 

 6.0-6.6 mm NL; late flexion, 6.7-7.7 mm NL; 

 postflexion, 7.9-12.9 mm SL. Caudal rays be- 

 come calcified between early flexion (5.9 mm 

 NL) and late flexion (7.2 mm NL). 



All precaudal neural spines stain with alizarin 

 by about 6.0 mm NL. Some caudal neural spines 

 and hemal spines stain with alizarin at 4.6 mm 

 NL, and all do by 6.0 mm NL. All precaudal 

 centra stain with alizarin by about 6.7 mm NL. 

 All caudal centra, including the urostyle, stain 

 with alizarin by about 7.2 mm NL. The smallest 

 specimen in which caudal centra could be 

 counted was 6.1 mm NL (early flexion). The sec- 



ond, third, and fourth dorsal rays are elongate 

 and widely separated at the bases from preflex- 

 ion (4.4 mm NL) through postflexion (12.9 mm 

 SL). During early caudal formation (5.0 mm NL) 

 rays near the middle of the fin begin to calcify. 



Calcification proceeds anteriorly and posteri- 

 orly. Adult counts are present from late flexion 

 (about 7.0 mm NL) onward. The first ray and the 

 most posterior rays are probably calcified prior 

 to transformation. 



During early caudal formation (5.0 mm NL), 

 anal rays near the middle of the fin begin to cal- 

 cify. Calcification proceeds anteriorly and pos- 

 teriorly. Adult counts are present from mid- 

 flexion (about 6.6 mm NL) onward. The most 



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