Park et al.: Larval development of Pandalopsis dispar 



123 



Maxilla (Fig. 5E) General shape 

 unchanged. 



First maxilliped (Fig. 5F) Exo- 

 pod with 16 plumose natatory 

 setae. 



Second maxilliped (Fig. 5G) 

 Exopod with 31-33 plumose 

 natatory setae. 



Third maxilliped (Fig. 5H) Exo- 

 pod with 46-48 plumose nata- 

 tory setae. 



Pereiopods (Fig. 5, l-M) Is- 

 chium slightly expanded in first 

 pereipod. 



Pleopods (Fig. 5N) Much more 

 developed than pleopods of 4 th 

 stage; exopod with 13, 1 setae; 

 endopod with 6 setae and ves- 

 tiges of appendix interna. 

 Uropod (Fig. 50) Exopod with 

 numerous minute spines on 

 outer margin 



Telson (Fig. 50) Both lateral 

 margins parallel; 19 termi- 

 nal spines; 2 pairs of lateral 

 spines. 



Sixth stage 



Carapace (Fig. 6A) CL, 4.0 mm 

 (SD: 0.21, n=48); adult-like. 

 Antennule (Fig. 6B) Inner 

 flagellum as long as outer fla- 

 gellum; inner flagellum with 

 multisegments; outer flagellum 

 with numerous segments. 

 Mandible (Fig. 6C) Incisor part 

 separated from molar process 

 and extended anteriorly. 

 Maxillule (Fig. 6D) 9 terminal 

 spines on basal endite. 

 Maxilla (Fig. 6E) Palp with 2, 2, 

 2, 1+2 spines; broad scaphogna- 

 thite with narrow posterior lobe 

 bearing 3 long setae. 

 First maxilliped (Fig. 6F) Exop- 

 odite with 4+2, 2, 2 3 long and 

 1 short spines. 



Second maxilliped (Fig. 6G) 

 spines; vestigial dactylus. 



Third maxilliped (Fig. 6H) Propodus armed with many 

 spines; dactylus with 2 spines. 



Pereiopods (Fig. 6, l-M) 1 st pereipods with subchelated 

 terminal segment; 1 st pereiopod with slightly expanded 

 ischium. 



Pleopods (Fig. 6N) Endopod and exopod with numer- 

 ous plumose natatory setae; endopod with epipod almost 

 adult-like. 



Uropods (Fig. 60) Biramous; larger than those of fifth 

 stage; adult-like. 



Measurement bars represent 1 mm. 



Figure 5 



Basal endite with 2 long 



Telson (Fig. 60) Telson with 20 terminal spines and 4 

 pairs of lateral spines. 



Discussion 



The first stage larva of Pandalopsis dispar described by 

 Berkeley (1930) is identical to the larva described in the 

 present study. However, we found that she overlooked 

 some important characteristics. She described the first 

 stage larva as having 24 setae on the margin of the telson. 

 We found, however, that the number of setae is variable, 

 and that the larvae have 11+12, 12+12, or 11+11 marginal 



