HAYNES: PANDALUS GONIURUS LARVAE 



THIRD MAXILLIPED (Figure II).— Protopodite 

 bears four setae. Endopodite distinctly five-seg- 

 mented; nearly as long as exopodite; setation for- 

 mula 5, 2, 1, 0, 2. Exopodite with 2 terminal, 10 

 lateral natatory setae. No epipodite. 



PEREOPODS.— Poorly developed, directed under 

 body somewhat anteriorly. First three pairs 

 biramous (second pereopod shown in Figure IJ), 

 last two pairs uniramous and slightly smaller 

 than pairs 1-3. 



PLEOPODS.— Not evident. 



TELSON (Figure IK).— Not segmented from 

 sixth abdominal somite; slightly emarginate dis- 

 tally; bears seven pairs of densely plumose setae. 

 Fourth pair of setae longest, length about one-half 

 width of telson. Minute spinules at base of each 

 seta except possibly last pair. Larger spinules 

 along terminal margin between bases of four inner 

 pairs and on setae themselves. Enclosed uropods 

 visible. No anal spine. 



STAGE II ZOEA 



Total length of Stage II (Figure 2 A) 4.9 mm 

 (range 4.5-5.3 mm; 10 specimens). Chromatophore 

 color and pattern essentially identical to Stage I 

 except chromatophores larger and color more pro- 

 nounced, especially in mouth parts. From this 

 stage on, zoeae become increasingly more orange 

 and color pattern is not useful as an aid to specific 

 identification. Rostrum still without teeth but not 

 curved downward as strongly as in Stage I. 

 Carapace has prominent supraorbital spine; an- 

 tennal and pterygostomian spines clearly visible. 

 These spines persist throughout all zoeal stages. 

 Epipodite still not bilobed; pleurobranchiae not 

 yet present. 



ANTENNULE (Figure 2B).— Three-segmented; 

 bears on terminal margin a large outer and a 

 smaller inner flagellum. Inner flagellum not seg- 

 mented, conical, and bears one long spine termi- 

 nally. Outer flagellum bears two groups of aes- 

 thetascs, one group terminally consisting of seven 

 aesthetascs, two of them larger than remaining 

 five, and a second group of two aesthetascs on 

 inner margin. A small budlike projection (not 

 shown in Figure 2B) originates at base of the two 

 flagella and bears three simple setae. Joint of 

 proximal segment faint and may not be complete; 



bears about five dorsally projecting small plumose 

 setae. Second segment has one lateral plumose 

 seta and about five dorsally projecting plumose 

 setae ringing terminal margin. Third segment has 

 five lateral plumose setae. 



ANTENNA (Figure 2C).— Flagellum unseg- 

 mented, still shorter than scale, styliform, and 

 tipped by a short spine. Antennal scale fringed 

 with 19 long, thin, plumose setae along terminal 

 and inner margins; small seta on outer margin 

 near base of terminal segments; has four joints 

 distally but only the three most distal joints are 

 complete. Protopodite bears minute spine at base 

 of scale in addition to spine at base of flagellum. 



MANDIBLES (Figure 2D).— More massive than 

 in Stage I. Both mandibles bear additional denti- 

 cles and molar processes more developed. Curved 

 lip of truncated end of molar process of right man- 

 dible more developed. 



MAXILLULE. — Unchanged from Stage I except 

 basipodite now bears two additional spinulose 

 spines. 



MAXILLA. — Shape similar to Stage I except 

 exopodite slightly longer proximally and now 

 bears nine marginal plumose setae in addition to 

 plumose seta at proximal end. No change in 

 number of setae on basipodite or coxopodite. 



MAXILLIPEDS.— Essentially identical to Stage I 

 but bear additional setae as follows. First maxil- 

 liped bears 17-20 setae on protopodite; exopodite 

 bears 6 natatory setae rather than 4 as in Stage I; 

 no change in epipodite. Second maxilliped bears 7 

 setae on protopodite; exopodite bears 10 lateral 

 natatory setae in addition to the 2 terminal setae; 

 endopodite five-segmented, setation formula 5, 2, 



1, 1, 3. Third maxilliped bears 2 setae on protopo- 

 dite; exopodite bears 10 lateral natatory setae in 

 addition to the 2 terminal setae; segments of en- 

 dopodite may or may not bear an additional seta or 



2, setation formula usually 5, 4, 0, 1, 2. 



FIRST PEREOPOD (Figure 2E).— Endopodite 

 functionally developed; five-segmented and ter- 

 minating in a simple conical dactylopodite; seta- 

 tion formula 4, 2, 1, 0, 0. Protopodite bears no 

 setae. Exopodite, longest among pereopods, has 2 

 terminal and 10 lateral natatory setae. 



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