MORGAN and PROVENZANO: DEVELOPMENT OF SQUILLA EMPUSA LARVAE AND POSTLARVA 



Figure 12. — Squilla empusa, stage IV, ventral view. 



Stage VI (Figure 17 A) 



Measurements (mm): RL, 3.00 to 3.50; PL, 

 1.65 to 2.00; TL, 9.80 to 10.60; CL, 2.65 to 2.95; 

 PW, 1.45 to 1.75. 



Antennule (Figure 2F) with four-segmented 

 inner flagellum. Median flagellum with three 

 segments. Outer flagellum with 12 to 14 aes- 

 thetascs arranged in four groups of 2 or 3, each 

 group with a seta. 



Antenna (Figure 3F) with 22 to 25 plumose 

 setae, endopod now two-segmented. 



Mandible (Figure 4F) essentially unchanged. 



Maxillule (Figure 5F) with coxal endite bearing 

 10 to 12 marginal teeth and 1 or 2 very short 

 medial setae, palp well developed, armed with 2 

 setae. 



Maxilla (Figure 6F) five-segmented, subproxi- 

 mal segment with endite bearing 14 to 19 setae. 

 Palp articulated. 



First maxilliped ( Figure 7Fi with 18 to 22 strong 

 setae arranged in six or seven groups of 2 to 4 on 

 propodus, carpus with 8 to 12 distal setae, con- 

 spicuous epipod present. 



Second maxilliped (Figure 8F) with 33 to 47 

 denticles along inner margin of propodus. 



Third maxilliped (Figure 13G) with endopod 

 four-segmented, dactylus not reflected against 

 propodus. 



Fifth maxilliped (Figure 131) with endopod un- 

 segmented. 



Pereiopods (Figure 14G to 151) unsegmented, 

 distally bifurcate, increased in length. 



Pleopods one through five (Figure 16F to 16J) 

 with gills present as buds on inner proximal mar- 

 gin of exopod. 



Uropods (Figure lOF) with basal prolongation 

 half length of endopod. exopod with or without one 

 spine on outer margin. 



Pleotelson (Figure lOF) with 8 to 10 pairs of 

 intermediate denticles. 29 to 33 submedian denti- 

 cles. 



Stage VII (Figure 17B) 



Measurements (mm): RL. 3.20 to 3.70; PL, 

 2.00 to 2.20; TL, 11.60 to 13.60; CL. 2.85 to 3.55; 

 PW, 1.85 to 2.30. 



Antennule (Figure 2G) with seven-segmented 

 inner flagellum, median flagellum five- 

 segmented, outer flagellum with 18 or 19 aes- 

 thetascs arranged in five or six groups of 2 or 3, 

 each with a seta. 



Antenna (Figure 30) with 32 to 39 plumose 

 setae, endopod with three segments. 



Mandible (Figure 40) essentially unchanged. 



Maxillule (Figure 5G) with coxal endite bearing 

 13 marginal teeth and 2 medial setae, endite with 

 spine flanked by 1 strong seta. Palp unchanged. 



Maxilla (Figure 60) four-segmented, the two 

 more proximal segments each with one endite. 

 Maxilla armed with 32 to 34 setae. 



First maxilliped (Figure 70) with 23 to 26 

 strong setae on propodus, in seven or eight groups 

 of 2 to 4. carpus with 21 to 27 setae. 



Second maxilliped (Figure 80) with 52 to 60 

 denticles along inner margin of propodus. 



Third, fourth, and fifth maxillipeds (Figure 13J 

 to 13L) fully articulated. 



Third maxilliped (Figure 13J) with dactylus 

 armed with spinules and reflected against prop- 

 odus, latter armed with 10 or 11 spinules. carpus 

 with 4 to 6 spinules. 



75 



