HAYNES: DESCRIPTION OF PANDALUS HYPSINOTUS ZOEAE 



MANDIBLES (FIGURE ID).— Mandibles with- 

 out palps. Incisor process of left mandible usually 

 bears four teeth in contrast to the distinctly 

 triserrate incisor process of right mandible. Left 

 mandible bears one premolar denticle and right 

 mandible bears two. Two subterminal processes 

 occur on truncated molar process of left mandible 

 but not on right mandible. 



MAXILLULE (FIGURE IE).— Maxillule (first 

 maxilla) bears coxal and basial endites and an 

 endopod. Proximal lobe (coxopodite) bears a stout 

 seta near base and 12 spinulose setae terminally 

 along with a series of extremely fine hairs. Me- 

 dian lobe (basipodite) bears 11 spinulose spines in 

 two rows on terminal margin and several fine 

 hairs subterminally. Endopodite originates from 

 lateral margin of basipodite and bears three 

 terminal and two subterminal setae; three of the 

 five spines are sparsely plumose, the remaining 

 two spinulose. There is no evidence of an outer 

 seta (representing a vestigial exopodite) on 

 maxillule. 



MAXILLA (FIGURE IF).— Maxilla bears plate- 

 like exopodite (scaphognathite) with 16 long, 

 approximately equal, evenly spaced plumose 

 setae along outer margin and one longer and 

 slightly thicker seta (at proximal end). Endopo- 

 dite has four partly fused segments and bears 

 nine large plumose setae. Basipodite bilobed; 

 each lobe bears eight setae. Bilobed coxopodite 

 bears 16 setae, 4 on distal lobe and 12 on proxi- 

 mal lobe. 



FIRST MAXILLIPED (FIGURE IG).— First 

 maxilliped most heavily setose of natatory ap- 

 pendages. Protopodite partially segmented; bears 

 7 setae on proximal segment and 18 slightly 

 smaller setae on distal segment; most setae on 

 protopodite plumose but some simple or spinu- 

 lose. Endopodite distinctly four segmented; seta- 

 tion formula— 4, 2, 1, 3. Exopodite a long slender 

 ramus segmented at base; has four terminal and 

 five or six lateral natatory setae. Epipodite a 

 single lobe. 



SECOND MAXILLIPED (FIGURE IH). —Pro- 

 topodite bisegmented; distal segment bears eight 

 sparsely plumose setae, and proximal segment 

 bears a simple seta. Endopodite distinctly five 

 segmented; fourth segment expanded laterally; 



terminal segment has at least two spinulose 

 setae; remaining setae on endopodite usually 

 sparsely plumose; setation formula — 7, 2, 1, 1, 3. 

 Exopodite similar to exopodite of first maxilliped 

 but slightly larger; has 4 terminal setae, 11 or 12 

 lateral natatory setae. No epipodite. 



THIRD MAXILLIPED (FIGURE II).— Proto- 

 podite bisegmented; distal segment bears four 

 setae. Endopodite distinctly five segmented and 

 nearly as long as exopodite, giving it more pedi- 

 form appearance than either of the two preceding 

 appendages; setation formula — 4, 8, 2, 2, 2. Ex- 

 opodite similar to second maxilliped but slightly 

 longer; has 3 or 4 terminal setae and 14 lateral 

 natatory setae. No epipodite. 



FIRST PEREOPOD (FIGURE IJ).— Endopo- 

 dite functionally developed and similar in form to 

 third maxilliped but slightly smaller Endopodite 

 distinctly five segmented; ends in simple conical 

 dactylopodite; setation formula — 3, 7, 2, 2, 2. Ex- 

 opodite naked. Protopodite bisegmented; has four 

 setae. Neither this nor remaining pereopods of 

 this stage have any evidence of epipodite. 



SECOND PEREOPOD (FIGURE IK).— Sec- 

 ond pereopod similar to first except that it has 

 fewer setae and fourth or propodal joint is 

 slightly extended to form beginning of chela. 



THIRD, FOURTH, AND FIFTH PEREOPODS 

 (FIGURE IL-N). — These three pereopods essen- 

 tially identical to each other except that they 

 decrease slightly in size from third to fifth. No 

 exopodites. 



PLEOPODS. — No pleopods evident, not even 

 as small buds. 



TELSON (FIGURE 10).— Telson not segmen- 

 ted from sixth abdominal segment; slightly 

 emarginate distally; bears 14 densely plumose 

 setae. Minute spinules at base of each seta; 

 larger spinules along terminal margin between 

 bases of four inner pairs and on the four inner 

 pairs of setae themselves. Enclosed uropods 

 visible. No anal spine. 



STAGE II ZOEA 



Total length of Stage II zoea (Figure 2A) 6.1 



325 



