MORGAN and PROVENZANO DEVELOPMENT OF SQUILLA EMPUSA LARVAE AND POSTLARVA 



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FIGURE 14.—Sqmlla empusa. A-C: stage IV. first to third pereiopods respectively; D-F: stage V, 

 first to third pereiopods respectively; G-I: stage VI. first to third pereiopods respectively; J-L: stage 

 VII, first to third pereiopods respectively; M-0: stage VIII, first to third pereiopods respectively; 

 P-R: stage IX, first to third pereiopods respectively. 



Fourth maxilliped (Figure 13K) with dactylus 

 armed with spinules and partially reflected 

 against propodus, latter armed with four to eight 

 spinules, carpus with four to six spinules, epipod 

 present. 



Fifth maxilliped (Figure 13L) segmented, dac- 

 tylus unarmed and not reflected against unarmed 

 propodus, carpus with zero to three spinules. 



Pereiopods (Figure 14J to 14L) with, clearly dif- 

 ferentiated endopods and exopods. though seg- 

 mentation not yet distinct. 



Pleopods (Figure 18A to 18E) with bilobed 

 rudimentary gills. 



Sixth pleomere partially separated from telson. 

 Uropods (Figure lOG) with basal prolongation 

 acute. Exopod with one or two spines on outer 

 margin, armed with zero to five plumose setae. 

 Endopod with zero to two plumose setae. 



Pleotelson (Figure lOG) with 9 or 10 pairs of 

 intermediate denticles, 32 to 35 submedian denti- 

 cles. 



Stage VIII (Figure 19) 



Measurements (mm): RL, 3.25 to 3.45; tL, 2.30 

 to 2.50; TL, 13.90 to 15.30; CL, 3.90 to 4.35; TW, 

 2.25 to 2.65. 



Antennule (Figure 2H) with inner flagellum 

 bearing 9 to 11 distinctly articulated segments. 

 Median flagellum with five to seven distinct seg- 

 ments. Outer flagellum with 21 to 23 aesthetascs 

 arranged in six or seven groups of 2 or 3, each 

 group with a seta in addition. 



Antenna (Figure 3H) with 40 to 55 plumose 

 seta. 



Mandible (Figure 4H) essentially unchanged. 



Maxillule ( Figure 5H) with coxal endite bearing 

 15 to 19 marginal teeth and 2 to 4 medial setae, 

 distal margin of basis with 1 median seta. 



Maxilla ( Figure 6H) armed with 40 to 58 setae. 



First maxilliped (Figure 7H) with 29 to 31 

 strong setae on propodus arranged in eight groups 

 of 2 to 5, carpus with 37 to 44 setae. 



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