HAYNES: PANDAI.IDAK. IIII'I'OLVTIDAK. ANnCKANCONII'AK LAKVAK 



Pleopods distinct and biramous; sides of tel- 

 son parallel or narrow posteriorly 5 



5. Carapace with supraorbital spine; exopodites 

 on maxillipeds and pereopods have natatory 



setae Stage V 



Carapace without supraorbital spine; exopo- 

 dites on maxillipeds and pereopods naked 



and vestigal Stage VI 



(megalopa) 



Pandalus goniurus Stimpson 

 (see footnote 7) 



Six larval stages. 



Stages I-V, VI (megalopa), and VII (first juvenile), 



all from both known parentage and plankton; 



figures 1-7 in Haynes (1978a). 

 Stages I-VII from plankton; figure 2 in Makarov 



(1967). 

 Stage I, known parentage; figure 1 in Ivanov 



(1965). 



In all stages, carapace and abdominal somites not 

 flared laterally; subterminal seta on basipodite of 

 maxillule. In Stages I-V, carapace usually with den- 

 ticles on anteroventral margin. In Stage I, pereopods 

 1 -5 tucked under carapace; exopodites of maxillipeds 

 1-3 with 4, 8, and 12 natatory setae, respectively; 

 lacinia mobilis on left mandible; 5 spinulose spines 

 terminally on basipodite of the maxillule; 5 setae 

 along outer margin of scaphognathite of maxilla. 

 Rostrum without teeth until Stage IV (in Stage 

 III. rostrum with beginning of a tooth at base); 

 rostral tip becomes bifid in Stage VI. Length: 

 Stages I-VI, 3.7-15.8 mm. Range: Sea of Japan to 

 Chukchi Sea to Puget Sound, WA; 5-450 m (Butler 

 1980). 



Key v.— Larval and first juvenile stages of Pandalus 

 goniurus (see footnote 6 and Table 4). 



1. Eyes sessile; pleopods absent; telson with 7 



-t- 7 setae Stage I 



Eyes stalked; pleopods present as minute 

 buds; telson with 8-1-8 setae 2 



2. Rostrum without teeth; pereopods 3-5 tucked 



under cephalothorax; uropods enclosed 



Stage II 



Rostrum either with undeveloped or devel- 

 oped teeth; all pereopods extended ventrally; 

 uropods free 3 



3. Rostrum with undeveloped tooth at its base; 

 antennal flagellum 3 segmented and about 

 2/3 length of scale; endopodite of uropod 



about 1/3 length of exopodite Stage III 



Rostrum with ^ 2 dorsal teeth; antennal fla- 

 gellum with ^ 6 segments and longer than 

 scale (not including setae); endopodite of 

 uropod nearly same length as exopodite 4 



4. Rostrum with 2 dorsal teeth; antennal flagel- 

 lum does not extend beyond plumose setae of 

 antennal scale; chela of pereopod 2 not form- 

 ed; width of telson increases posteriorly .... 



Stage IV 



Rostrum with > 2 dorsal teeth; antennal 

 flagellum extends beyond plumose setae of 

 antennal scale; chela of pereopod 2 nearly or 

 fully formed; lateral margins of telson nearly 

 parallel or narrow posteriorly 5 



5. Carapace with supraorbital spine; rostrum 

 with 5 or 6 dorsal teeth, no ventral teeth; tip 

 of rostrum styliform (may have undeveloped 

 bifid tip); lateral margins of telson nearly 



parallel Stage V 



Carapace without supraorbital spine; 

 rostrum with dorsal and ventral teeth; tip of 

 rostrum bifid; lateral margins of telson 

 narrow posteriorly 6 



6. One or two setae betw^een several posterior 

 dorsal teeth of rostrum; 2-segmented mandi- 

 bular palp without setae; exopodites of maxil- 

 liped 3 and pereopods present but reduced; 

 carpopodite of left and right pereopods 2 



with 20-25 and 7-9 joints, respectively 



Stage VI 



(megalopa) 

 One or two setae between most, if not all, 

 rostral teeth; 3-segmented mandibular palp 

 with spiniform setae; no exopodites on maxil- 

 liped 3 and pereopods; carpopodites of left 

 and right pereopods 2 with 29 and 1 1 joints, 

 respectively Stage VII 



Pandalus hypsinotus Brandt 



Seven larval stages. 



Stages I-VI, VII (megalopa), and VIII-IX (juven- 

 iles), known parentage; figures 1-6 in Haynes 

 (1976). 



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

 plankton; figures 5-6 in Kurata (1964a). 



Stage I, known parentage; Stages II and III, from 



269 



