TUCKER: LARVAL DEVELOPMENT OF C1THAR1CHTHYS AND ETROPUS 



Figure 11.— Larval stages of Etropus crossotus: A. Transforming, 10.5 mm; B. Nearly transformed, 10.3 mm. Scale = 1 mm. 



rics given in the following discussion are from 

 Gutherz (1967). 



The larval mouth is relatively small. During 

 flexion and postflexion relative mouth size is 

 similar to that of C. spilopterus. The adult mouth 

 is the smallest of known western North Atlantic 



Etropus and Citharichthys species. Larval upper 

 jaw length/BL is fairly constant at 7.0-7.2%. Lar- 

 val upper jaw length/HL decreases from 30% to 

 27% (preflexion to postflexion). Adult upper jaw 

 length/HL is 21-27%. Larval lower jaw length/ 

 BL is fairly constant at 9.6-9.8%. Larval lower 



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