Oda: Egg and larval development of Paralichthys californicus and Xystreurys holepis 



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Figure 1 



Eggs of Paralichthys californicus (o 

 = oil globule): (A) stage II (LACM 

 44978), (B) stage IV (LACM 44978), 

 (C) stage VI (LACM 44978), (D) dor- 

 sal view of embryo, stage VI (LACM 

 44978), (E) stage VII (LACM 047 88 

 15 OB 02S), (F) dorsal view of em- 

 bryo.stage VII (LACM 047 88 15 OB 

 02S). 



The embryonic shield is first visible as a thickening 

 in the blastoderm when the germ ring encloses approx- 

 imately 70-80% of the yolk (stage IV, Fig. IB). The 

 eyes and 10-15 somites are visible at about the time 

 the blastopore closes (stage VI). At the end of stage 

 VI, the lateral and posterior margins of the tail are 

 defined, 15-20 somites are present, and pigment devel- 



ops on the dorsal surface of the embryo posterior to 

 the eyes and on the yolk near the oil globule and off 

 the lateral margins of the body (Figs. 1C,D). 



As the tail develops and separates from the yolk 

 (stage VII), a thin finfold becomes visible, the midbrain 

 shows definition, lens primordia form, and 20-25 

 somites are present. Pigment on the yolk, previously 



