HAYNES: LEBBEUS GROENLANDICUS LARVAE 



MAXILLULE (FIGURE IE).— First maxilla, or 

 maxillule, bears coxal and basial endites and an 

 endopodite. Proximal lobe (coxopodite) bears 15 

 setae, most of them spinulose. Median lobe 

 (basipodite) bears 24 spines terminally, 9 of them 

 spinulose; and 2 spines subterminally, 1 of them 

 plumose and the other simple. A series of fine hairs 

 occurs in vicinity of the simple spine. Endopodite 

 originates from lateral margin of basipodite and 

 bears three terminal and two subterminal 

 spinulose setae. No evidence of outer seta on 

 maxillule. 



MAXILLA (FIGURE IF).— Bears platelike 

 exopodite (scaphognathite) with 33 long, plumose 

 setae along outer margin, and a longer, thick seta 

 at the proximal end. Endopodite not segmented; 

 setae spinous, setation formula 2, 2, 1, 2, 3. Both 

 basipodite and coxopodite bilobed. Basipodite 

 bears 29 setae, 14 on distal lobe and 15 on proxi- 

 mal lobe. Coxopodite bears 23 setae, 5 on distal 

 lobe and 18 on proximal lobe. 



FIRST MAXILLIPED (FIGURE IG).— 

 Protopodite segmented; bears 27 setae on distal 

 segment and 8 on proximal segment, most of them 

 spinulose. Endopodite four-segmented; setation 

 formula 4, 3, 3, 7. Basal segment of endopodite 

 bears conspicuous setulose spine. Exopodite seg- 

 mented at base; bears four natatory setae. Epipo- 

 dite distinctly bilobed. 



SECOND MAXILLIPED (FIGURE IH).— 

 Protopodite not segmented; bears nine setae, five 

 of them spinulose. Endopodite five-segmented; 

 fourth segment expanded somewhat laterally; 

 terminal segment tipped by five setae and bears 

 single seta subterminally; basal segment bears 

 conspicuous setulose spine like that on basal seg- 

 ment of endopodite of first maxilliped; setation 

 formula 6, 4, 2, 3, 4. Exopodite about three times 

 longer than endopodite; bears five natatory setae. 

 Epipodite present but not bilobed. 



THIRD MAXILLIPED (FIGURE II).— 

 Protopodite not segmented; bears three setae. En- 

 dopodite five-segmented; as long as exopodite; 

 number of setae somewhat variable. Exopodite 

 bears five natatory setae. No epipodite. 



FIRST PEREOPOD (FIGURE IJ).— Endopodite 

 relatively short, wide, and partially segmented; 

 chela partially formed; dactylopodite bears three 

 simple spines. Exopodite a small lobe. 



SECOND PEREOPOD.— Similar in shape to first 

 pereopod except narrower, exopodite smaller, and 

 chela more deeply cleft. 



THIRD (FIGURE IK) TO FIFTH PEREO- 

 PODS. — Each pair essentially identical except 

 that they decrease slightly in size from third to 

 fifth. No exopodites. 



PLEOPODS.— First pleopod (Figure IL) slightly 

 cleft, without joints or setae. Second pleopod (Fig- 

 ure IM) bilobed; outer lamella segmented; inner 

 lamella usually only partially segmented but 

 bears bud of appendix interna. Third to fifth 

 pleopods essentially identical to second pleopod 

 except both lamellae distinctly segmented. 



ABDOMEN AND TELSON (FIGURES lA, 

 IN). — Abdomen consists of five segments and tel- 

 son (somite six is fused with telson in Stage I). 

 Fourth and fifth abdominal segments each with 

 pair of posterolateral spines nearly as long as 

 segments themselves. Telson slightly emar- 

 ginated distally; bears 19-21 densely plumose 

 setae; small spinules occur between bases of all 

 setae except two outermost pairs. Enclosed 

 uropods visible. Anal spine present. 



STAGE II ZOEA 



Total length of Stage II 8.3 mm (range 8.1-8.7 

 mm; 8 specimens). Color similar to Stage I zoea but 

 more diffuse. Rostrum (Figure 2 A) arched upward; 

 slightly blunter than in Stage I; without teeth. 

 Carapace bears supraorbital, antennal, and 

 pterygostomian spines in addition to several 

 spinules along anteroventral margin. 



ANTENNULE (FIGURE 2B).— Shows considera- 

 ble change from Stage I. Largest conical projection 

 segmented at tip; terminal segment bears three 

 setae of different lengths; proximal segment bears 

 six groups of five aesthetascs each in addition to 

 row of four aesthetascs laterally and single seta 

 distally. Smallest conical projection bears three 

 nonplumose setae, one long and two short. Pedun- 

 cle of antennule rounded laterally, not segmented, 

 and bears five plumose setae that originate ven- 

 trally. 



ANTENNA (FIGURE 2C).— Flagellum of an- 

 tenna still two-segmented, but slightly stouter 

 and projection at tip smaller than in Stage I; a few 



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