JACKSON ET AL.: KEY TO GENERA OF PENAEID LARVAE 



Figure 2. — Atypapenaeus formosus protozoea II. (a) whole animal, (b) 1st antenna, (c) 2nd antenna, (d) mandibles, (e) 1st 

 maxilla, (f) 2nd maxilla, (g) 1st maxiUiped, (h) 2nd maxiUiped, (i) 3rd maxiUiped. Scale = 0.1 mm. 



Protozoea III (Table 1, Fig. 3a) retaining long 

 rostrum and supraorbital spines. Some setae in 

 2nd antennal fonnula of H-2+2 are small but 

 always present (Fig. 3c). Maxillae (Fig. 3e, f), 

 maxillipeds (Fig. 3g, h, i) similar to previous 

 substage, although generally more robust and 

 more setose. Dorsal spines occasionally on 4th 

 abdominal segment and always on 5th; lateral 



spines on 5th and 6th segments (Fig. 3a). 

 Uropods present (Fig. 3a). 



MYSIS. Chai'acteristics that ai-e invaiiant in the 

 mysis stage of A. fonnosus are rostrum extend- 

 ing beyond eye, lack of supraorbital and hepatic 

 spines, presence of pterygostomial spine, 7+7 

 telson spines, 6th abdominal segment always 



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