FISHERY BULLETIN: VOL. 82, NO. 2 



aesthetascs and two simple setae (one terminal 

 and one lateral). 



Antenna (Fig. 2D). — Antenna with inner flagel- 

 lum and outer antennal scale; flagellum without 

 setae and shorter than scale. Antennal scale un- 

 jointed distally, fringed with six heavily plumose 

 setae along terminal and inner margins, and 

 prominent spine distally on outer margin. Ventral 

 surface of protopodite with spinulose spine at base 

 of flagellum and smaller naked spine at base of 

 scale. 



Mandible (Fig. 2E). — Incisor processes of left and 

 right mandibles a single tooth. Anterior margins 

 of each mandible with premolar denticles. No sub- 

 terminal processes or movable premolar denticles. 



Maxillule (Fig. 2F). — Similar to Stage I Placetron 

 wosnessenskii except spines of basipodite less 

 spinulose and proximal segment of endopodite 

 with two simple setae terminally instead of one. 



Maxilla (Fig. 2G). — Scaphognathite with seven 

 long plumose setae on outer margin, no proximal 

 expansion, setation formulae of endopodite, basi- 

 podite, and coxopodite same as in Stage I Place- 

 tron wosnessenskii. Fine hairs on margins of basi- 

 podite and coxopodite. 



Maxillipeds 1-3 and pereopods 1-5. — Nearly iden- 

 tical in shape and number of setae to those of Stage 

 I Placetron wosnessenskii. 



Pleopods. — Absent. 



Abdomen and telson (Fig. 2A, H). — Short blunt 

 spines on abdominal somites 2-5; length of outer 

 pair on somite 5 about 0.8 times maximum width 

 of somite. Telson with medial invagination and 7 

 + 7 posterior spines. Third pair of telsonic spines 

 longest, about 3/4 maximum telson width; minute 

 seta between spinal pairs 1 and 2 sometimes with- 

 out setules; spinules on spinal pairs 2-6. No uro- 

 pods or anal spine. 



Stage II Zoeae 



Mean carapace length, 1.30 mm (range 1.21-1.34 

 mm, 10 specimens); mean total length, 4.81 mm 

 (range 4.02-5.03 mm, 10 specimens). No supra- 

 orbital spine. Eyes stalked. Characters not men- 

 tioned are nearly identical to characters of Stage 

 I. 



Antennule. — Distal conical projection segmented 

 from peduncle. 



Antenna. — Tip of flagellum may have small 

 spine. Antennal scale with seven plumose setae 

 along terminal and inner margins. 



Mandible. — Right mandible with five teeth be- 

 tween incisor and molar processes. 



Maxillule. — Basipodite with five terminal spines 

 (four slightly spinulose). 



Maxilla. — Scaphognathite with 11 plumose setae 

 on outer margin; no proximal expansion. Setation 

 formulae of endopodite 4, 1, 3. 



First and second maxillipeds. — Exopodite with 

 seven natatory setae terminally. 



Third maxilliped (Fig. 3). — Exopodite with six 

 plumose setae terminally. Endopodite with two 

 plumose setae terminally. 



Pleopods. — May be present as minute buds. 



Abdomen and telson. — Identical to Stage I except 

 joint between somite 6 and telson indicated by 

 small indentation in lateral margins. 



0.5 mm 



FIGURE 3.— Stage II zoea of Rhinolithodes 

 wosnessenskii: third maxilliped, lateral. 



320 



