FISHERY BULLETIN: VOL. 83, NO. 3 



Table 4— Morphological characteristics for distinguishing between larvae of Pandalus 

 borealis and P. goniurus reared in situ in Kachemak Bay, Alasl<a (from Haynes 1979). 



Stage and characteristic 



Pandalus borealis 



Pandalus goniurus 



Stage I zoea: 



Mean total length 



Number of plumose setae 

 fringing antennal scale 

 Number of spines 

 terminally on basipodite 

 of maxillule 

 Number of plumose setae 

 on scaphognathite (in 

 addition to single 

 proximal seta) 

 Number of natatory setae 

 on each exopodite: 

 maxilliped 1 

 maxilliped 2 

 maxilliped 3 

 Stage II zoea: 



Mean total length 



Rostrum 



Antennal flagellum 

 Antennal scale 

 Stage IV zoea: 

 Mean total length 



Rostrum 

 Antennal flagellum 



Propodite of pereopod 2 



Pleopods 



Stage V zoea: 



Mean total length 



Rostrum 



Chela of pereopod 2 



Pleopods 



Stage VI (megalopa): 

 Mean total length 



Rostrum 



6.7 mm (range 6.5-7.3 mm; 

 25 specimens) 



19 



11 



5-6 

 13-14 

 16 



7.5 mm (range 6.7-8.2 mm; 

 25 specimens) 



10 specimens) 

 1-2 conspicuous teeth 

 8-segmented 

 about 30 setae 



13.0 mm (range 12.6-13.2 

 mm; 10 specimens) 

 6-7 dorsal teeth 



about 1 Vz times length of 

 scale, extending past 

 tips of plumose setae 



projected anteriorly about 

 1/2 length of 

 dactylopodite 



segmented, pleopod 2 

 about 1/2 height of 

 abdominal somite 



16.0 mm (range 15.2-17.1 

 mm; 10 specimens) 

 9-12 dorsal teeth; tip bifid; 

 45 partially developed 

 ventral teeth 



fully formed 



with appendix interna; 

 fringed with plumose 

 setae; 2 as long or 

 longer than height of 

 abdominal somite 



18.5 mm (range 17.4-20.2 

 mm; 5 specimens) 



13-15 dorsal teeth, 

 6-7 ventral teeth 



4.0 mm (range 3.7-4.2 mm; 

 10 specimens) 



4 



8 



12 



5.9 mm (range 4.5-5.3 mm; 

 10 specimens) 



about 19 



6 

 12 



14 



12, 8, 8 



6.2 mm (range 6.0-6.6 mm; 



10 specimens) 

 1 inconspicuous tooth 

 3-segmented 

 about 20 setae 



7.7 mm (range 6.8-8.3 mm; 



10 specimens) 

 2 dorsal teeth 

 longer than scale but not 

 extending past tips of 

 plumose setae 

 projected anteriorly only 

 slightly 



unsegmented, pleopod 2 

 about 1/3 height of 

 abdominal somite 



10.3 mm (range 8.2-11.3 mm; 



10 specimens) 

 5-6 dorsal teeth; tip not 

 bifid (but may show 

 slight protuberance); 

 no ventral teeth 



not fully formed, propodite 

 extension about 1/2 

 length of dactylopodite 



without appendix interna; 

 2-4 simple setae 

 terminally; pleopod 2 

 about 2/3 height of 

 abdominal somite 



13.8 mm (range 11,1-15.8 



mm; 6 specimens) 

 8-9 dorsal teeth, 

 4-5 ventral teeth 



268 



