PUERTO RICAN COPEPODS — GONZALEZ AND BOWMAN 251 



PedSeg 1 ; PedSegs 4 and 5 separate; PedSeg 5 very short and narrower 

 than other segments. Forehead rather strongly convex. Posterior 

 margins of PedSegs 2, 3, and 4 serrate laterally; serrations extend 

 dorsally on PedSeg 4. Posterior corners of PedSeg 5 rounded, each 

 armed posteriorly with a group of long, fine hairs and a number of 

 shorter, fine hairs. Urosome 3-segmented. Genital segment strongly 

 produced ventrally; genital operculum conspicuous, bearing a few 

 setules on posterior margin; posterior part of segment produced 

 dorsally into lobe; segment armed with groups of spines and setae 

 as shown in figures Qa-c. Middle part of segment 2 produced dorsally 

 into hump bearing 2 platelike lobes; right lobe more conspicuous and 

 more elevated. Caudal rami long and narrow, about 7 times as long as 

 wide; left ramus a little longer than right; medial margins bearing 

 long setules; distal halves of lateral margins with shorter setules. 



Al reaching slightly beyond posterior margin of genital segment, 

 21-segmented. Ril of A2 with 4 dentate spines on lateral margin. 

 Md palp with 4-segmented Re and 2-segmented Ri; gnathal lobe with 

 9 teeth. Mxl and Mx2 normal; setal armature as shown in figures 7a 

 and 9. Mxp with Ri of 4 segments; segments 1-3 with peculiar 

 bifurcate setae. 



P1-P4 with armature of spines and setae characteristic of the 

 genus and surface spinules as in figures Qd-f, 76-c. P5 symmetrical. 

 B2 with a few spinules on distolateral corner. Re 2-segmented; distal 

 margin of Rel produced into rounded lobe, proximal to which is 

 slender spine on lateral margin, a row of spinules on anterior surface, 

 and sometimes a row of spinules on medial margin. Re2 very similar 

 to that of P. coronatus; shorter medial branch of bifurcate terminal 

 spine about as long as or slightly shorter than setose mediodistal 

 process. 



Egg sacs subequal, left sac slightly larger than right. 



Male. — Much smaller than female, length 0.93-1.0 mm. In lateral 

 view prosome (0.67-0.72) about 2.3 times as long as urosome (0.27- 

 0.33 mm) . Serrations on posterior margins of PedSegs 3 and 4 present 

 or absent, sometimes present on PedSeg 3 but not on PedSeg 4. 

 Posterior margin of PedSeg 5 without setae. Posterior margins of 

 urosome segments 2-4 armed with dentate spines; spines narrow and 

 closely spaced on ventral surface, becoming broader and more widely 

 separate laterad and dorsad. Urosome segment 2 without spines 

 dorsally, with V-shaped group of slender spines on ventral surface 

 slightly posterior to middle of segment, apex of V anteriad. 



Urosome segment 3 sometimes with smaller transverse row of spines 

 at about middle of ventral surface. Caudal rami about twice as long 

 as wide, with fine hairs on medial margins but not on lateral margins. 



