HAYNES DESCRIPTION OF PANDALUS BOREALIS LARVAP; 



ANTENNA (Figure 2C).— Flagellum two- 

 segmented, still shorter than scale, styliform, and 

 tipped by two small simple setae and short spine. 

 Antennal scale fringed with 25 or 26 long, thin, 

 plumose setae along terminal and inner margins; 

 still has six joints distally but only the three most 

 distal joints complete. Protopodite bears minute 

 spine at base of scale in addition to conspicuous 

 spine at base of flagellum. 



MANDIBLES (Figure 2Dl.— More massive 

 than in Stage I. Incisor processes of both mandi- 

 bles bear additional tooth. Both mandibles bear 

 additional denticles and molar processes more de- 

 veloped. Lacinia mobilis of left mandible consists 

 of single spinous denticle. Curved lip of trun- 

 cated end of molar process of right mandible more 

 developed than in Stage I. 



MAXILLULE (Figure 2E).— Coxopodite bears 

 12-15 spines and row of fine hairs proximally; 

 spinules on two of the terminal spines of coxopo- 

 dite resemble a row of teeth. Basipodite and en- 

 dopodite essentially unchanged from Stage I, ex- 

 cept basipodite bears two additional spinulose 

 spines. 



MAXILLA (Figure 2F, exopodite and 

 endopodite). — Exopodite similar in shape to Stage 

 I except more distinctly expanded proximally; 

 bears 17-19 marginal plumose setae in addition to 

 plumose seta at proximal end. Endopodite un- 

 changed from Stage I. Coxopodite bears 3 setae on 

 distal lobe and 17-19 on proximal lobe. Each lobe 

 of basipodite bears additional seta. 



MAXILLIPEDS.— Essentially identical to 

 Stage I but bear additional setae as follows. On 

 first maxilliped, protopodite bears 8-10 setae on 

 proximal segment and 19-21 on distal segment; 

 endopodite bears 4, rarely 5, setae on proximal 

 segment; exopodite bears 7 or 8 natatory setae 

 rather than 5 or 6 as in Stage I; no change in 

 epipodite. On second maxilliped, protopodite bears 

 seta on proximal segment and 8-10 setae on distal 

 segment; exopodite bears 14 lateral natatory setae 

 in addition to the 2 terminal setae. On third maxil- 

 liped, endopodite bears additional seta terminally 

 on dactylopodite, 2 additional setae on propodite, 

 and additional seta on carpopodite, setation for- 

 mula 5, 7, 3, 1, 2; exopodite bears 16 lateral nata- 

 tory setae in addition to 2 terminal setae. No gill 

 buds on second or third maxillipeds. 



FIRST PEREOPOD (Figure 2G).— Protopodite 

 bears three setae. Endopodite functionally de- 

 veloped; five-segmented, terminating in simple 

 conical dactylopodite; setation formula 5, 3, 2. 2, 2. 

 Exopodite, longest among pereopods, bears 2 ter- 

 minal and 14 lateral natatory setae. 



SECOND PEREOPOD (Figure 2H),— 

 Protopodite bears two setae. Endopodite similar to 

 first pereopod except shorter; setation formula 4, 

 3, 1, 1, 2. Exopodite bears 2 terminal and 13 or 14 

 lateral natatory setae. 



THIRD PEREOPOD (Figure 21).— Protopodite 

 bears two setae. Endopodite one-fourth to one- 

 third longer than exopodite; dactylopodite slightly 

 longer than in first two pereopods; setation for- 

 mula 3, 4, 2, 1, 2. Exopodite noticeably shorter 

 than exopodites of first and second pereopods and 

 bears 2 terminal and 9 or 10 lateral natatory setae. 



FOURTH PEREOPOD (Figure 2J).— 

 Endopodite five-segmented but still poorly de- 

 veloped and directed under body somewhat an- 

 teriorly as in Stage I (Figure 2A); dactylopodite 

 and propodite bear two setae and three setae, re- 

 spectively. No exopodite. 



FIFTH PEREOPOD (Figure 2K).— Similar to 

 fourth pereopod but shorter and dactylopodite 

 tipped with single seta. No exopodite. 



PLEOPODS (Figure 2A).— Present as distinct 

 buds. 



TELSON (Figure 2L).— Similar in shape to 

 Stage I but distinctly jointed from sixth abdominal 

 somite; bears 8 4-8 densely plumose setae. 

 Uropods still enclosed. Anal spine present but mi- 

 nute. 



STAGE III ZOEA 



Mean total length of Stage III 9.5 mm (range 

 9.0-10.0 mm; 10 specimens). From this stage on, 

 zoeae gradually become more orange and color 

 pattern not useful in identifying a given stage. 

 Rostrum (Figure 3A) projects horizontally but 

 curves slightly downward at tip; bears one or two 

 teeth at base. Epipodite of first maxilliped bilobed; 

 pleurobranchiae present as small buds. 



ANTENNULE (Figure 3B, inner and outer 



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