TUCKER: LARVAL DEVELOPMENT OF CITHARICHTHYS AND ETROPUS 



A 



B 



D 



Figure 2.— Development of the caudal skeleton of Citharichthys cornutus: A. Preflexion (early caudal formation), 5.7 mm NL; 

 B. Early flexion, 6.0 mm NL; C. Midflexion,6.4mmNL; D. Late flexion, 8.2 mm NL;E. Postflexion, 13.7 mm SL. NS = neural spine, 

 HS = hemal spine, H Yl = hypural 1, HY2+3 = hypurals 2 and 3, 4+5 = hypurals 4 and 5, H Y6 = hypural 6, EP =epural, PV = penulti- 

 mate centrum, UR = urostyle. Scale = 1 mm. 



centrum (according to Hensley 1977, in the 

 bothid Engyophrys senta this bone consists of the 

 first and second ural centra and the first preural 

 centrum); a penultimate, or second preural, cen- 

 trum (see Hensley 1977); an enlarged hemal 



spine from the second preural centrum support- 

 ing hypural 1; autogenous, proximally free, 

 hypural 1 which supports three unbranched and 

 one branched ray (equivalent to "parhypural" of 

 some authors— e.g., Futch 1977; Hensley 1977— 



45 



