FISHERY BULLETIN VOL 77. NO 2 



globose, enlarged, posterolateral border with 1 1 or 

 12 setae; three pairs of minute interocular setae; 

 other setae as in stage III. Bud of third maxilliped 

 and thoracic appendages enlarged, more evident 

 under carapace. 



Abdomen (Figure 4A, B). Pleopod buds now 

 present on second through sixth somites, but much 

 reduced on sixth. First somite with 5-7 setae on 

 dorsal posterior margin; sixth with a pair of small 

 posterolateral spines or knobs. Posterolateral 

 spines on third, fourth, and dorsolateral spines on 

 fifth somites more elongate than in previous stage. 



Telson (Figure 4C). Similar in form to third 

 stage; 4 setae on posterior telsonal margin. Dorsal 

 and lateral spines on median portion of furcae 

 miniscule as in previous stage. 



Antennule (Figure 4D). Similar in form to third 

 stage aesthetascs increased to 7 or 8, arranged in 

 three tiers progressing distally: 2 small, 1 small, 3 

 large plus 1 or 2 small. 



Antenna (Figure 4E). Exopodal spine usually ex- 

 tending 0.1 X beyond protopodal process and only 

 0.75 X length of exopodite. Terminal tip of en- 

 dopodal bud extending to base of lateral spinules 

 of protopodal process and about 0.4 x its length. 



Mandible (Figure 4F). Left molar process un- 

 changed, right molar process with 2 or 3 irregu- 

 larly rounded prominences which join margin of 

 incisor process. 



MaxUlulc (Figure 4G). Endopodal setation un- 

 changed; basal endite with 12 setae (6 or 7 strong, 

 5 or 6 thinner) plus a long plumose lateral seta as 

 in previous stage; coxal endite with 8 setae (5 

 strong plus 3 thinner). 



Maxilla (Figure 4H). Endopodite unchanged; 

 setae on each basal endite usually 6,5 (5-7, 5-6); 

 coxal endite setae 6,4 (uncommonly 7,4). 

 Scaphognathite with 25-29 plumose setae. 



Maxilliped 1 (Figure 41). Coxopodite now with 2 

 setae; basi- and endopodite setae unchanged. 

 Exopodite with 10 natatory setae. 



McLxilliped 2 (Figure 4J). Coxo-, basi-, and en- 

 dopodal setae unchanged. Exopodite with 10 

 natatory .setae. 



Maxilliped 3 (Figure 4K). Bilobed, rudimentary 

 process, without setae, visible through cara- 

 pace. 



Color. Zoeae similar in color to third stage. 

 Basipodite of first and second maxillipeds now 

 orange-yellow. In lateral view, abdomen gold dor- 

 sally, brown medially, deep orange-rose ventrally. 

 Ommatidia more evenly rose colored, cornea 

 emerald green. Other chromatophore placement 

 and color unchanged. 



Fifth Zoeac (ultimate) 



Carapace length; 1.55 mm. 

 Number of specimens examined: 11. 

 Remarks: Ultimate fifth stage zoeae molted 



directly to megalopae without an intercalated 



molt to sixth stage. 



Carapace ( Figure 5A, B). Distinctly increased in 

 size from fourth stage. Carapace length, as in pre- 

 vious stages, about 1.2-1.3* longer than dorsal 

 and rostral spines. Posterolateral margin witli 

 15-20 setae. Other carapacial setae as described 

 and illustrated for fourth stage. Third maxilliped 

 and pereiopods increased in size, visibly extended 

 from beneath carapace, segmentation evident. 



Abdomen (Figure 5A, B). First somite usually 

 with 10 (8-10) dorsal setae. Setae on second 

 through fifth somites unchanged, each bearing 2 

 on posterodorsal margin. Small lateral spines on 

 second and third, posteroventral spines on third 

 and fourth, and dorsolateral spines on fifth somite 

 elongate. Posteroventral prominence of sixth so- 

 mite broad, unlike slender spines of preceding so- 

 mites. Pleopods on second to fifth somites, each 

 with well-developed exopodite and a rudimentary 

 endopodite; sixth rudimentary. 



Telson (Figure 5C). An additional fifth seta may 

 occur on the posterior margin of the telson. When 

 exopodite of the second maxilliped has 12 plus 1 

 setae, telson exhibits 2 small medial setae dorsally 

 near telsonal posterior margin as shown; if there 

 are only 12 natatory exopodal setae, telson is 

 naked. 



Antennule (Figure 5D). Endopodal bud now 

 present below tiers of aesthetascs, latter progress- 

 ing distally 7,7,1,5; basal region swollen but un- 

 segmented, with 2 small basal setae. 



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