FISHERY tU'LLETIN: VOL. 83. NO. 3 



plankton; figures 6 (only Stage I figured) in 

 Berkeley (1930). 



In all described stages, carapace without denticles 

 on anteroventral margin; posterior margins of ab- 

 dominal somites without spinules. In Stage I, 

 thoracic appendages segmented, dactyli undevelop- 

 ed; naked exopodites on pereopods 1 and 2; telson 

 not jointed with abdominal somite 6. Beginning in 

 Stage III, basipodite of maxillule with subterminal 

 seta; anal spine present. Length: Stages I-VII, 

 5.5-12.8 mm. Range: Sea of Japan to western Ber- 

 ing Sea; Norton Sound to Puget Sound, WA; depth, 

 5-460 m (Butler 1980). 



Key VI. — Larval stages of Pandalus hypsinotus. 



1. Eyes sessile; naked exopodites on pereopods 



Stage I 



Eyes stalked; exopodites on pereopods with 

 natatory setae 2 



2. Rostrum without teeth; uropods enclosed . . . 



Stage II 



Rostrum with ^ 1 dorsal tooth at base; 

 uropods free 3 



3. Rostrum with dorsal tooth at base and no 

 ventral teeth; exopodites on maxilliped and 



pereopods with natatory setae Stage III 



Rostrum with ^11 dorsal teeth and ^ 2 

 small ventral teeth; naked, vestigial exopo- 

 dites on maxillipeds and pereopods 4 



4. Rostrum with 11-13 dorsal teeth and 2 or 3 

 small ventral teeth; tip of rostrum not bifid; 

 mandibular palps unsegmented; telson 

 margins nearly parallel but widen slightly 



posteriorly Stage IV 



Rostrum with > 13 dorsal teeth and > 3 ven- 

 tral teeth; tip of rostrum bifid; mandibular 

 palp with 3 segments; telson slightly wider 



at midlength or narrows posteriorly 5 



5. Bilobed pleopods without setae; telson slight- 

 ly wider at midlength Stage V 



Biramous pleopods with setae; telson nar- 

 rows posteriorly 6 



6. Carpopodite of left and right pereopods 2 

 with 19 and 7 or 8 joints, respectively; pleo- 

 pods with setae only at tip; telson with 3 



pairs of dorsolateral spines Stage VI 



Carpopodite of left and right pereopods 2 



with 24 or 25 and 10 joints, respectively; 

 pleopods setose; telson with ^ 4 pairs of 



dorsolateral spines Stage VII 



(megalopa) 



Pandalus jordani Rathbun 



Thirteen larval stages. 



Stages I-XIII, known parentage; figures 1-7 in 

 Modin and Cox (1967). 



Stages I-XIII, Stages XIV and XV (juveniles), all 

 from both known parentage and plankton; fig- 

 ures 1-15 in Rothlisberg(1980). 



Stages I-VIII, known parentage; figures 5-11 in 

 Lee (1969). 



In all described stages, carapace and abdominal 

 somites not flared laterally and lack denticles or 

 spinules; basipodite of maxillule without subterminal 

 seta (except possibly Stage I). Pereopods tucked 

 under carapace in Stage I. Rostrum without teeth in 

 Stage I; rostnun with undeveloped dorsal tooth in 

 Stage II; rostral tip bifid beginning at Stage VIII. 

 Length: Stages I-XIII, 5.1-16.3 mm. Range: Un- 

 alaska. AK, to San Nicolas Island, CA; depth, 36-457 

 m (Butler 1980). 



Key VII. — Larval and first juvenile stages of Pandalus 



jordani. 



1. Eyes sessile; telson and abdominal somite 6 



not jointed Stage I 



Eyes stalked; telson and abdominal somite 6 

 jointed 2 



2. Rostrum with precursor of first dorsal tooth; 



uropods enclosed Stage II 



Rostrum with ^ 1 movable dorsal tooth; 

 uropods free 3 



3. Rostrum with 1 movable dorsal tooth; endo- 

 podite of uropod a bud with only a few setae 



" Stage III 



Rostrum with > 1 movable tooth; endopodite 



of uropod > 1/2 length of exopodite and se- 

 tose 4 



4. Posterior width of telson about twice 



anterior width Stage IV 



Posterior width of telson noticeably less than 

 twice anterior width 5 



5. Lateral margins of telson widen slightly 

 posteriorly Stage V 



270 



