FISHERY BULLETIN: VOL. 79, NO. 3 



or present on one furca while absent from the other 

 on the same individual. 



Color. Similar to that of first zoea, but noticeably 

 intensified. Pale orange highlights distal three- 

 fourths of rostrum, dorsal spine, antennae, and 

 antennules. Gut color more burnt orange, extend- 

 ing through abdominal somite 4. Mandibles most 

 pronounced in burnt orange, outer surfaces 

 scarlet. 



Third Zoea 



Carapace length: 0.76 mm. 

 Number of specimens examined: 8. 



Carapace (Figure 4A, B). Rostrum preorbital 

 protuberances pronounced, angular. Dorsal spine 

 with 3 (occasionally 2 or 4) small, scattered proxi- 

 mal setae with some scattered distal setae and 

 minute tubercles. Lateral spines with 3 or 4 mi- 

 nute dorsal tubercles. Carapace ventral margin 

 with 2 or 3 setae. Mediodorsal knob with 2 or 3 

 additional smaller integumental sensillae located 

 within rectangular region previously demarcated 

 by 4 sensillae of second zoea; 6 setae anterior, 4 

 setae posterior to mediodorsal knob. 



Antennule (Figure 4C). With 3 aesthetascs and 1 

 naked seta at tip, 1 subterminal budlike projec- 

 tion. 



Antenna (Figure 4D). Similar to earlier stage, 

 endopodite more developed, with pointed tip 

 slightly exceeding exopodite length. 



Mandibles (Figure 4E). As illustrated, without 

 palp. 



Maxillule (Figure 4F). Coxal endite with 8 thick, 

 plumose setae. Basal endite with 5 pectinate 

 spines, 3 long sparsely plumose setae, 1 subtermi- 

 nal plumose seta, almost no minute hairs. En- 

 dopodite as in first zoea. Protopodite with 1 distal 

 plumose seta. 



Maxilla (Figure 4G). Coxal endite bilobed with 5 

 proximal, 4 distal plumose setae. Basal endite 

 bilobed with 5 proximal, 4 distal plumose setae. 

 Endopodite as in first zoea except all setae naked. 

 Scaphognathite with 17 to 20 marginal plumose 

 setae. 



Maxilliped 1 (Figure 4H). Coxopodite with 1 

 (rarely 2) seta. Five-segmented endopodite seta- 

 tion now 2, 2, 1, 2, 5+1. Exopodite with 8 terminal 

 natatory setae. 



Maxilliped 2 (Figure 41). Coxopodite without 

 setae. Three-segmented endopodite setation now 

 1, 1, 6. Exopodite with 9 terminal natatory setae. 



Maxilliped 3. Present as small, unbranched 

 lobe. 



Pereiopods (Figure 4B). Apparent as small rud- 

 iments beneath carapace. 



Abdomen (Figure 4A, B). Sixth somite present, 

 lacking posterolateral spines and posterodorsal 

 setae. Somite 1 with 2 or 3 posterodorsal setae; 

 somites 2-5 as in second zoea, but with posterolat- 

 eral spines of somites 3-5 progressively longer; 

 somites 2-6 developing small pleopod buds; those 

 of somite 6 barely apparent. 



Telson (Figure 4A, B). Median sinus with 2 

 small plumose setae. Secondary minute lateral 

 furcal spines may or may not be present as in 

 second zoea. 



Color Rostrum, dorsal spine, antennules, an- 

 tennae nearly colorless. Maxillipeds with pale 

 orange spreading through much of basipodites. 

 Mandibles slightly darker burnt orange. Orbits 

 pale mint green blending into faint sky blue at 

 interorbital region. Sky-blue stellate chromato- 

 phore at dorsal spine base. Vandyke-brown stel- 

 late chromatophore fringed in olive, mint green, 

 sky blue at lateral spine bases. Pereiopod buds 

 light orange. Gut burnt orange through somite 3, 

 with small spots of pale orange highlighting 

 pleopod buds on somites 3-5. 



Fourth Zoea 



Carapace length: 0.84 mm. 



Number of specimens examined: 9. 



Carapace (Figure 5A, B). Rostrum preorbital 

 protuberances recurved into anteriorly directed 

 hooks. Dorsal spine with 4 small proximal setae, 

 few scattered minute tubercles. Lateral spines as 

 in third zoea. Carapace ventral margin with 6-11 

 (usually 9) setae. Mediodorsal knob with 4 outer 

 sensillae (arranged as rectangle) surrounding 4 

 smaller inner sensillae; 10 setae anterior, 4 setae 

 posterior to knob. 



Antennule (Figure 5C). Biramous. Endopodite 

 half exopodite length, naked, pointed at tip. 

 Exopodite two-segmented with 12 aesthetascs ar- 

 ranged proximally to distally (2, 6) (1, 3 apical) 

 plus 1 naked seta at tip. Protopodite swollen prox- 

 imoventrally, supporting 2 minute plumose setae. 



Antenna (Figure 5D). Endopodite at least one- 

 half protopodite length. 



Mandibles (Figure 5E). As illustrated; palp 

 present. 



Maxillule (Figure 5F). Coxal endite with 11 or 12 

 setae (small proximal seta occasionally absent). 



494 



