48 



S. KARAYTUG AND G.A. BOXSHALL 



100 



\jvi 



Fig. 6 P.fimbriatus. Urosome of female copepodids, dorsal. A, Copepodid I; B, Copepodid II; C, Copepodid III; D, Copepodid IV; E, Copepodid 

 V. Scale bar in |im. 



First segment of antennule (Fig. 2E) with spinular row on 

 outer margin. Third segment acquiring 3 small naked setae. 

 Endopod of antenna (Fig. 3E) with additional small naked seta 

 distally. Basis of mandible (Fig. 4E) with 4 setae. Maxillule (Fig. 

 IE) with 1 new naked seta on inner lobe. 



Nauplius VI 



Body length : mean ± standard deviation = 241 ± 8.49 um (range 

 255 to 224 um, n= 1 6), mean body width 1 52 ± 7.28 (range 143 to 

 162 um). Body (Fig. IF) similar to nauplius V, differing as 

 follows: innermost pair of caudal setae longest, middle pair of 

 setae plumose, shortest setae naked and laterally located. 



Third segment of antennule (Fig. 2F) with total of 13 setae, 

 including 5 new setae, plus ornamentation of several long 

 spinules. Endopod of antenna with 9 setae (Fig. 3F), with 1 extra 

 seta in proximal group. Mandible (Fig. 4F) with minor changes 

 in ornamentation of basal setae. 



Maxillule with 1 new seta on inner lobe, and with 3 spinules on 

 outer margin. Anlagen of post-maxillulary limb pairs apparent 

 on ventral surface of body (Fig. IF). 



Description of Copepodid Stages 



Copepodid I 



Body length : mean ± standard deviation = 382 ±11.5 um (range 

 373 to 404 um, n=10), mean body width 146 ± 5.7 um (range 134 

 to 152 um, n=10). Body 5-segmented (Fig. 5A), comprising 

 cephalothorax and 4 postcephalothoracic trunk somites. Second 

 trunk somite with 1 seta at posterolateral angles representing 

 third swimming legs. Antennule, antenna, mandible, maxillule, 

 maxilla, maxilliped and first and second swimming legs present. 

 Caudal rami (Fig. 6A) as broad as long. Each ramus armed with 

 6 setae, ornamented with spinular row on ventral surface, 

 outermost seta plumose with spinular row at base, 1 naked seta 

 located on dorsal surface posteriorly, 1 short naked seta close to 



