NO. 3570 PANDARIDAE — CRESSEY 57 



segmented. First segment 218/x long. Second segment 360^ long. 

 Caudal rami long, measuring 720/x by 144ju (about 5 times as long 

 as wide). Each ramus bearing 4 plumose terminal setae and 2 

 shorter subterminal ones. Each ramus plumose along inner edge. 



Oral area as in female. Setae on first and second antennae slightly 

 longer than in female. 



Legs 1-4 biramose with spine and setal formula as follows: 



Leg 1 as in female. Leg 2 endopod of only 2 segments. Leg 3 with 

 modification as in figure 287. Leg 4 (fig. 288) bearing a prominent 

 spine on outer distal corner of first exopod segment. Leg 5 (fig. 289) 

 located on posterior corners of genital segment, composed of a process 

 bearing a stout terminal spine and 3 setae on inner margin. Distal 2 

 setae plumose. Proximal one naked. Leg 6 (fig. 290) located at 

 junction of abdomen and genital segment, composed of an inner stout 

 spine and an outer plumose seta. 



Color in life cream and devoid of pigment. 



Discussion. — This copepod was recently redescribed by Shiino 

 (1954). He described a male of this species also, but a closer exami- 

 nation shows this to be actually the male of Pandarus satyrus. A 

 comparison of his description and figures leaves no doubt as to its 

 true identity. He comments that there is "a remarkable dimorphism 

 found between the sexes." This is not the case when one considers 

 the true male of this species, described here for the first time. The 

 modification on the third leg is well formed, establishing the position 

 of this species in group II. I have synonymized D. neozealanica 

 Thomson, 1889, with this species since Thomson's original description 

 fits in every way. 



This copepod is found generally on the body surface of a wide 

 variety of pelagic sharks. It is occasionally recovered from the gills 

 also. I collected large numbers of this species from Alopias vulpinus 

 in the Indian Ocean. On this host the copepod often occurred in 

 great clusters (200-300 copepods) around the opening of the cloaca. 

 Females far outnumber the males in such cases. This copepod has 

 been reported from the Atlantic (Smith, 1874), North Pacific (Shiino, 

 1954), and I have collected it from the Indian Ocean and received 

 material from the Central Pacific. This seems to indicate a cosmo- 

 politan distribution. It is apparently a common parasite of the genus 

 Alopias. 



