FISHERY BULLETIN: VOL. 80. NO. 2 



endopod segment 3 swelling in formation of 

 chela (Fig. 16a); exopods with 20-24, usually 22, 

 setae; endopods usually with setation of 3-4-5-4, 

 rarely 5 and 4 setae on segments 2 and 3; 

 bases with 3 or 4 setae. Leg 4 exopod with 18- 

 21 setae, endopod usually with setation of 3-3-4, 

 rarely with 2 and 4 setae on segments 1 and 2. 

 Leg 5 exopod with 16-19 setae, endopod usually 



with setation of 2-3-4, rarely with 3 setae on 

 segment 1. 



Pleopods (Fig. 15b) nonsetose but longer than 

 in preceding stage, exopods again decreasing in 

 length from anterior to posterior pairs; pleopods 

 2-5 with endopod which increases in size 

 posteriorly with variation in size within stage 

 with age. 



0. 1 mm 

 I 1 



c-d,f 



Figure 16.— Sergestes similis. Leg 2: a, zoea II; b, postlarva I. Leg 4: c, zoea I. Leg 5: d, zoea I. Legs 4 and 5: e-f, postlarva HI. 



236 



