HAYNKS: I'AiNDAI^lDAK, HM'POLYTIDAK, ANDCKANCONIDAK l.AKVAK 



with subterminal seta. Carapace usually with denti- 

 cles on anteroventral margins in Stages I-V. 

 Rostrum without teeth until Stage III; rostral tip 

 bifid in Stage V. In Stage I, exopodites of maxillipeds 

 1, 2, and 3 with 5 or 6, 13 or 14, and 16 natatory 

 setae, respectively; pereopods tucked under cara- 

 pace; left mandible with a lacinia mobilis; basipodite 

 of maxillule with 9 spinulose spines terminally; sca- 

 phognathite of maxilla with 12 setae along outer 

 margin. Length: Stages I-VI, 6.5-20.2 mm. Range: 

 Sea of Japan to Chukchi Sea to Columbia River 

 mouth (northwestern United States); Barents Sea to 

 North Sea; western Greenland to Gulf of Maine; 

 depth, 16-1,380 m (Butler 1980). 



Key HI. — Larval and first juvenile stages of Pandalus 

 borealis (see footnote 7 and Table 4). 



1. Eyes sessile; pleopods absent; telson with 7 



+ 7 setae Stage I 



Eyes stalked; pleopods present as minute 

 buds; telson with 8 + 8 setae 2 



2. Rostrum without teeth; pereopods 4 and 5 

 tucked under cephalothorax; uropods 



enclosed Stage II 



Rostrum with ^ 1 dorsal tooth at base; pereo- 

 pods 4 and 5 extend ventrally; uropods free ... 3 



3. Rostrum with 1 or 2 dorsal teeth at base; 

 antenna] flagellum with 8 segments and 

 same length as scale; endopodite of uropod 



about 1/3 length of exopodite Stage III 



Rostrum with ^ 4 dorsal teeth; antennal 

 flagellum with > 15 segments and longer 

 than scale; endopodite of uropod > 1/2 length 



of exopodite 4 



4. Rostrum with 4-8 dorsal teeth (usually 6), 

 without ventral teeth; tip of rostrum styli- 

 form; pleopods with a few small setae at tip; 

 endopodite of uropod about 2/3 length of 



exopodite Stage IV 



Rostrum with > 8 dorsal teeth and ^ 4 ven- 

 tral teeth; tip of rostrum bifid; pleopods 

 setose; endopodite of uropod nearly as long 

 as expodite 5 



5. Rostrum with 9-12 dorsal teeth and 4 or 5 

 small ventral teeth; carapace with supra- 

 orbital spine; telson with 2 spines on each 

 lateral margin; lateral margins of telson 



nearly parallel Stage V 



Rostrum with > 12 dorsal teeth and ^ 6 



distinct ventral teeth; carapace without 

 supraorbital spine; telson with ^ 4 spines on 

 each lateral margin; lateral margins of telson 

 taper posteriorly 6 



6. Mandibles without palps; exopodites on max- 

 illipeds and pereopods reduced in size; lateral 

 margins of telson converge posteriorly but 

 widen slightly at junction with posterior 



margin Stage VI 



(megalopa) 

 Mandibles with palps; vestigial exopodites on 

 maxillipeds and pereopods; telson with lat- 

 eral margins converging to narrow tip, as in 



adult Stage VII 



(first juvenile) 



Pandalus danae Stimpson 



Six larval stages. 



Stage I, known parentage; Stages II-VI, from 

 plankton; figures 3-5 in Berkeley (1930). 



In all described stages, carapace without denticles 

 on anteroventral margin; basipodite of maxillule 

 without subterminal seta; posterior margins of ab- 

 dominal somites without spinules. In Stage I, 

 thoracic appendages developed; naked exopodites on 

 pereopods 1 and 2; telson jointed with abdominal 

 somite 6. Length: Stages I-VI, 5.7-17.0 mm. 

 Range: Resurrection Bay, AK, to Point Loma, CA; 

 depth, intertidal to 185 m (Butler 1980). 



Key IV. — Larval stages of Pandalus danae. 



1. Eyes sessile; carapace without supraorbital 

 spine; exopodites on pereopods 1 and 2 with- 

 out natatory setae Stage I 



Eyes stalked; carapace with supraorbital 

 spines; exopodites on pereopods 1 and 2 with 

 natatory setae 2 



2. Rostrum without teeth; uropods enclosed . . . 



Stage II 



Rostrum with teeth; uropods free 3 



3. Rostrum with 2 or 3 minute dorsal teeth at 

 base; endopodite of uropods noticeably 



shorter than exopodite Stage III 



Rostrum with ^ 8 teeth dorsally; endopodite 



of uropods same length as exopodite 4 



4. Pleopods small, slightly cleft buds; telson 

 widens slightly posteriorly Stage IV 



267 



