JACKSON ET AL.: KEY TO GENERA OF PENAEID LARVAE 



at most 1 dorsal tooth; small hepatic spine some- 

 times present (Fig. 11a, b). Epipod of 2nd 

 maxilla (Fig. llg) more enlarged than that of A. 

 formosus at same substage. Mysis II (Fig. 12) 

 with 2 dorsal rostral teeth, hepatic spine always 

 present (Fig. 12a). In contrast to A. formosiis, 

 still no statocyst in 1st antenna (Fig. 12b), but 

 2nd antennal flagellum already as long as blade 

 (Fig. 12c). Posterior border of telson with only 



slight cleft, and small median spine (telson for- 

 mula now 1+1 + 7) (Fig. 12k). Mysis III (Fig. 13) 

 with 2 or 3 dorsal rostral teeth and an epigastric 

 tooth. First antenna now usually with a small 

 statocyst (Fig. 13b); 2nd antennal flagellum 

 longer than blade (Fig. 13c). Mandibles with un- 

 segmented palp (Fig. 13d). Telson notch absent, 

 posterior margin slightly rounded. Median spine 

 still very short (Fig. 13k). 



(b) (c) 



(J) 



Figure 12. — Metapenaeopsis palmensis mysis II. (a) whole animal (lateral view), (b) 1st antenna, (c) 2nd antenna, (d) 

 mandibles, (e) 1st maxilla, (f) 2nd maxilla, (g) 1st maxilliped, (h) 2nd maxilliped, (i) 3rd maxilliped, (j) 1st pereopod, (k) 

 telson. Scale = 0. 1 mm. 



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