FISHERY BULLETIN: VOL. 78, NO. 3 



Male. — Rostrum slightly produced, broader than 

 long. Thoracic segments each slightly narrower 

 than preceding segment. Genital segment longer 

 than broad. Abdomen 2 -segmented. Caudal rami 

 each with one very long and five shorter setae. 

 First antenna extending beyond margins of 

 cephalothorax, with numerous long slender setae. 

 Second segment of maxilliped ornamented on 

 inner surface with numerous small, knoblike 

 spinules, one long seta, and a row of short 

 spinules; terminal segment in focm of a claw 

 armed with stout teeth along entire inner margin 

 apposing second segment. Legs 1-4 biramous, rami 

 3-segmented except endopod of leg 4 2-segmented. 

 Leg 1 endopod flattened. Second endopod segment 

 of legs 2 and 3 each with two inner setae. 



Type-species . — Pseudorbitacolax varunae (Bennet 

 1966). 



Remarks. — In placing two more species in this 

 genus we have been able to modify Pillai's (1971) 

 original generic diagnosis, especially with regard 

 to the size and shape of the rostrum and the first 

 maxilla. As with. Pumiliopsis, the structure of the 

 rostrum is a specific rather than a generic charac- 

 ter. The three setae of the first maxilla are of vari- 

 able lengths rather than all small as stated by 

 Pillai. 



Our diagnosis of the male is based on a single, 

 damaged specimen of Pseudorbitacolax fimbriatus 

 and, as such, must be considered tentative until 

 additional material is collected. 



Pseudorbitacolax fimhriatus 

 new species (Figures 1-17) 



Material examined. — Two collections containing 3 

 916 (holotype 9 USNM 173021, allotype 6 USNM 

 173022, two paratype 9 USNM 173023) from the 

 eyes of two SardineUa fimbriata (BM 1972.9.5.22, 

 BM 1972.9.5.25) from New Guinea. 



Female. — Body form as in Figure 1. Total length 

 3.66 mm, greatest width 1.60 mm (measured at 

 widest part of cephalothorax). Cephalothorax 

 length 1.42 mm and with lateral marginal mem- 

 branes. Rostrum (Figure 2) with bilobed tip, each 

 lobe gently rounded, with two dorsal hooks near 

 base; rostrum length 236 ^tm, width at base 206 

 jLtm. Genital segment (see Figure 1) wider than 

 long (389 X 601 yitm) with a greatly rounded pro- 

 cess at each outer distal corner. Abdomen 



2-segmented: first segment wider than long (118 x 

 224 yum) without ornamentation; second segment 

 wider than long (94 x 200 ^tm) with two ventral 

 patches of scalelike spinules arranged in uneven 

 longitudinal rows (see Figures 3 and 4). Caudal 

 rami (Figure 3) longer than wide (82 x 53 yum); 

 each ramus with a patch of scalelike spinules 

 in rows (Figure 4) and six setae (longest seta 

 289 yum). 



First antenna (Figure 5) 5-segmented: basal two 

 segments with 9 naked and 15 plumose setae; lat- 

 ter with broad, flattened plumosities ( Figure 6 ); an 

 aesthete present on each of last two segments. 

 Second antenna (Figure 7) with several rows of 

 minute spinules on third segment, four hooked 

 spines, and two setae distally. Labrum with two 

 large patches of scalelike spinules. Mandible, 

 paragnath, first maxilla, and second maxilla as in 

 Figure 8. Labium represented as a small, rounded, 

 hairy lobe posterior to mouth. Base of maxilliped 

 (Figure 9) posterior to oral area, armed with four 

 setae and a strongly curved hook without an acces- 

 sory process. 



Legs 1-4 biramous, rami of legs 2-4 3-seg- 

 mented. Leg 1 (Figure 10) interpodal plate with 

 two patches of scalelike spinules; coxopod with 

 broad inner seta; basipod with two patches of 

 scalelike spinules; exopod first segment with outer 

 spine, second segment with two naked and seven 

 plumose setae; endopod first segment with outer 

 patch of scalelike spinules and inner plumose seta, 

 second segment with outer patch of scalelike 

 spinules and six plumose setae; outer edges of en- 

 dopod heavily hirsute. Basipod of leg 2 (Figure 11) 

 with large ventral patch of scalelike spinules and a 

 short dorsal seta; first segment of exopod with 

 patch of scalelike spinules (Figure 11a) covering 

 most of segment and one spine on outer distal 

 corner, second segment with outer spine and outer 

 patch of minute pointed spinules (Figure lib), 

 third segment with two outer spines, one barbed 

 terminal spine and three inner setae, outer por- 

 tion of segment with two distinct patches of 

 spinules similar to those on second segment; first 

 segment of endopod with minute, barely percepti- 

 ble inner seta and a large patch of scalelike 

 spinules, outer edge of segment fringed with short, 

 blunt hairs, second segment with two inner setae 

 and outer patch of scalelike spinules, outer edge of 

 segment fringed with short hairs, third segment 

 with two inner setae, one terminal spine and outer 

 to terminal patch of scalelike spinules. Basipod of 

 leg 3 (Figure 12) with dorsal seta, exopod and first 



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