FISHERY BULLETIN; VOL. 87, NO. 3. 1989 



Figure 3. — Atypopenaeus formosus protozoea III. (a) whole animal, (b) 1st antenna, (c) 2nd antenna, (d) mandibles, (e) 

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



bearing a dorsal spine, lack of lateral abdominal 

 spines. 



Mysis I (Table 1, Fig. 4) without rostral teeth. 

 First antenna biramous, bearing a strong ven- 

 tral spine on first segment (Fig. 4c). Second 

 antenna devoid of segmentation on both endopod 

 and exopod (Fig. 4d). Mandibles similar to those 

 of protozoea III, although stronger and with 



more teeth (Fig. 4e). Structure of 1st maxilla 

 (Fig. 4f) similar, but epipod on 2nd maxilla, the 

 formative scaphognathite, is beginning to in- 

 crease in size (Fig. 4g). First 2 maxillipeds sim- 

 ilar to previous substage but 3rd much more 

 elongate (Fig. 4h, i, j). Rudiments of chelae ap- 

 pearing on 1st 3 pereopods (Fig. 4k). Usually a 

 small dorsal spine on 5th abdominal segment, 



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