FISHERY BULLETIN: VOL. 80, NO. 2 



L 



1 .0 mm 



J 



0.5 mm 



0.25 mm 



Figure 4.— Stage IV zoea of Lithodes aequispina: A, carapace, lateral; B, antenna, ventral; C, third maxilliped, lateral; D, pereopod 



1, lateral; E, pereopod 2, lateral; F, pereopod 5 (terminal segments), lateral. 



Terminal spine of antennal scale somewhat 

 curved. 



Maxillule and mandibles. — Essentially identical 

 to Stage III. 



Pleopods. — Pleopods 2-5 about 1.4 times height 

 of somites. Pleopods without setae; pleopod 6 

 unsegmented, about one-third length of telson, 

 with two (sometimes three) short setae terminal- 



ly. 



Maxilla.— Scaphognathite with about 45 plu- 

 mose setae along inner and outer margins. 



Maxillipeds (Fig. 4C, third maxilliped).— No 

 change in maxillipeds from Stage II except 

 endopodite of third maxilliped with four simple 

 setae on penultimate segment. Exopodite with 

 eight or nine natatory setae. 



Pereopods (Fig. 4D, pereopod 1; E, pereopod 2; F, 

 pereopod 5).— Dactylopodite of chela of pereopod 

 1 with teeth. Pereopods 2-5 adult in shape. 

 Propodite of pereopod 5 setose. 



Abdomen and telson. — Dorsoposterior spines on 

 somites 2-5 reduced in size, often absent on 

 somite 2. Telson jointed with somite 6; with 11 + 

 11 plumose setae (rarely 12 + 12). 



STAGE V (GLAUCOTHOE) 



Mean total length of Stage V larvae, 5.9 mm 

 (range 5.2-6.3 mm, eight specimens). Glaucothoe 

 characteristically spinous (Fig. 5A, J, K). Eye 

 stalk with one anterior spine, three dorsal spines. 



Antennule (Fig. 5B).— Adult in form. 



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