FISHERY BULLETIN: VOL. 71, NO. 1 



Mandibles larger than in zoea I and with 

 prominent palp bud. 



Maxilla I with unsegmented endopodite bear- 

 ing four or five terminal setae and a number of 

 fine hairs along anterior margin; basal endite 

 with 10 or 11 setae; coxal endite with 11 to 13 

 setae. 



Maxilla II with unsegmented endopodite bear- 

 ing nine setae grouped 3, 2, 4 progressing dis- 

 tally. Basal endite bilobed; both distal and prox- 

 imal lobes with 11 or 12 setae each. Coxal endite 

 bilobed: distal lobe with seven setae; proximal 

 lobe with 11 to 15 setae. Scaphognathite with 

 16 to 18 outer marginal setae, three apical setae 

 and one on internal margin of posterior lobe 

 (total 20 to 22 setae), all plumose. Fine hairs 

 occur on scaphognathite margin between plu- 

 mose setae and elsewhere on appendage as fig- 

 ured. 



Maxilliped I biramous. Coxopodite with one 

 or two distal setae. Basipodite with setae 

 grouped 2, 2, 3, 3 proximal to distal. Endopodite 

 four-segmented: segment 1 with three distal 

 setae, inner margin; segment 2 with three distal 

 setae, inner margin and one distal seta, outer 

 margin; segment 3 with two medial and three 

 distal setae, inner margin and one medial seta, 

 outer margin; segment 4 with five or six ter- 

 minal setae and one proximal seta, outer margin. 

 Exopodite two-segmented with 14 natatory setae 

 on distal segment. 



Maxilliped II biramous. Coxopodite lacks 

 setae. Basipodite with three setae grouped 1, 2 

 proximal to distal. Endopodite four-segmented: 

 segments 1 and 2 each with two distal setae, 

 inner margin and one distal, outer margin; seg- 

 ment 3 with one medial, two distal, inner margin 

 and one medial seta, outer margin ; segment 4 

 with four to six (usually five) terminal setae 

 and one proximal seta on outer margin. Ex- 

 opodite two-segmented with 14 natatory setae 

 on distal segment. 



Maxilliped III biramous, larger than in zoea I; 

 endopodite curved anteriad; appendage grows 

 and additional segments become defined during 

 stage. 



Pereiopods present as five pairs of limb buds, 

 pairs one and five distinctly chelate; buds ex- 

 pand in size throughout stage and become dis- 



tinctly segmented in a late zoea II. 



Abdominal somites larger but otherwise sim- 

 ilar to those in zoea I; pairs of pleopods, unequal 

 in length, occur ventrally on segments 2, 3, 4, and 

 5; pleopods increase in length throughout stage. 



Telson similar to form in zoea I but with single 

 median seta (Figures IE and 41) added to cen- 

 tral prominence and size increased; anal spine 

 present. 



Basic pattern of primary red chromatophores 

 same as in prezoea and zoea I; however, new 

 chromatophores appear in the late second stage 

 zoea on the growing pereiopods and on body be- 

 neath carapace. Carapace 1.72 to 1.98 mm in 

 length. Rostrum bears distinct ventral bulge 

 just anterior to eyes (Figure 2E). 



MEGALOPA 



(Figures 5 and 6) 



Antennule biramous with three-segmented 

 peduncle. Dorsal ramus with six segments; 

 segments 2, 3, and 4 each bear two tiers of 

 aesthetascs and segment 5 bears one tier; num- 

 bers of aesthetascs per tier are approximately 

 3-4, 2-3, 3, 2, 2-3, 2, 2 progressing distally (spec- 

 imens damaged) ; one long seta present on each 

 of segments 3 and 4 associated with the distal 

 aesthetasc tier. Ventral ramus with three dis- 

 tinct segments, the distal segment itself appear- 

 ing indistinctly divided; setation as figured. 



Antennal flagellum usually composed of 17 

 segments; peduncle three-segmented; hairs and 

 bristles associated with the distal end of each 

 segment along the length of the flagellum vary 

 in number and pattern of distribution. 



Mandible strongly sclerotized, partially cup- 

 shaped appendage with bladelike leading edge 

 which may be somewhat irregular but is not 

 strongly toothed as in the zoea; three-segmented 

 palp present with about six spinelike setae on 

 terminal segment. 



Maxilla I with probably two-segmented endop- 

 odite (specimens damaged) bearing one or 

 more setae; basal endite with a total of 21 or 22 

 spines and setae arranged predominantly along 

 the distal margin; coxal endite with approx- 

 imately 26 processes, most of them slender setae 

 in contrast to the spinelike processes of the basal 



198 



