FISHERY BULLETIN: VOL. 83, NO. 3 



Pandalus platyceros Brandt 



Five larval stages. 



Stages I-V and Stages VI-X (juveniles), known 



parentage; figures 1-6 in Price and Chew (1972). 

 Stage I, known parentage; Stages II, IV?, and V?, 



from plankton; figures 9 and 10 in Berkeley 



(1930). 



In all described stages, rostrum with teeth, basi- 

 podite of maxillule without subterminal seta. In 

 Stages I-III, carapace flares laterally, lateral 

 margins with denticles; abdominal somites flare 

 laterally, lateral margins with spinules (Fig. 5). In 

 Stage I, pleopods present as buds; telson jointed with 

 abdominal somite 6. In Stages II and III, less flaring 

 of abdominal somites and smaller denticles and 

 spinules than in Stage I. Thoracic appendages devel- 

 oped in Stage I, except naked endopodites on pereo- 

 pods 1-3. Length: Stages I-V, 8.1-13.0 mm. Range: 

 Sea of Japan, Hokkaido; Unalaska Island, AK, to off 

 San Diego, CA; depth, intertidal to 487 m (Butler 

 1980). 



Key IX. — Larval and first juvenile stages of Pandalus 

 platyceros. 



1. Rostrum without ventral teeth (Fig. 6); eyes 

 sessile; pereopods with naked exopodites 



Stage I 



Rostrum with ventral teeth; eyes stalked; 

 pereopods with setose exopodites 2 



2. Antennal flagellum with 6 segments and 

 flagellum only slightly longer than plumose 



setae of scale; uropods enclosed Stage II 



Antennal flagellum with ^15 segments and 

 flagellum at least twice length of scale; 

 uropods free 3 



3. Antennal flagellum about twice length of 

 antennal scale; telson widens posteriorly; 

 telson with 1 pair of lateral spines .... Stage III 

 Antennal flagellum > 3 times length of 

 antennal scale; telson margins parallel or 

 converge posteriorly; telson with > 1 pair of 

 lateral spines 4 



4. Carapace with supraorbital spines; mandibles 

 without palps; pereopod 2 with unsegmented 

 carpopodite; telson with 2 pairs of lateral 



spines Stage IV 



Carapace without supraorbital spines; mandi- 

 bles with palps; pereopod 2 with segmented 



Figure 5. -Dorsal view of 

 body. Stage I zoea of Payi- 

 dalles platyceros. 



L 



1 . mm 



Figure 6. - Rostrum, Stage I zoea Pandalus platyceros. 



carpopodite; telson with > 3 pairs of lateral 

 spines 5 



5. Telson margins nearly parallel, distal margin 



concave Stage V 



(megalopa) 



272 



