508 



the claw; the 6th segment has almost parallel margins, its length is 3.5 

 times its width, and the distal half of the anterior margin bears a few 

 setae. The 4th-6th segments of pereopods III-IV bear sparse setae along 

 the posterior margin. The 2nd segment of pereopods V is broadened, the 

 anterior margin is almost straight and bears four equidistant denticles, 

 the posterior margin bulged; the maximum width of the segment occurs 

 in the middle, is equal to half length of the segment and length is equal 

 to the total length of the 3rd-5th segments together; the 4th-6th segments 

 are medially armed with a few setae each. In pereopods VI the maximum 

 width of the 2nd segment is shifted proximally and is 2/3 the length; the 

 anterior margin is smooth, slightly bulged proximally, and straight in the 

 distal half; the posterior margin is strongly bulged, indistinctly denticu- 

 late, and has a few regularly arranged setae; the 4th and 6th segments 

 are equal in length, the 5th shorter, and all three anteriorly finely den- 

 ticulate with groups of fine denticles separating the larger ones. The 2nd 

 segment of pereopods VII is almost rhombic, distally less narrowed than 



411 in O. piscator and O. clausi, its length slightly more than its maximum 

 width (in proximal part) or equal to it; the distal part of the leg is equal 

 in length to the 2nd segment; the 4th-6th segments are equal in length 

 and each successive segment is narrower than the preceding one. 



The end of the basipodite of uropods I does not extend beyond 

 the end of the basipodite of uropods II and the distal 2/3 of the inner 

 margin is denticulate; the exopodite is shorter than the endopodite, its 

 inner margin and both margins of the endopodite are denticulate. The 

 basipodite of uropods II is 1 .5 times longer than the endopodite and its 

 margins, as also the outer margin of the exopodite, are smooth. The 

 basipodite of uropods III is the same length as the endopodite and the 

 ornamentation of the rami similar to that of uropods I and II. The telson 

 is triangular, with straight margins, denticualte in the distal part, and has 

 a pointed tip. 



The body proportions vary little; the head constitutes 1/4 the total 

 body length; the pereon in males is equal in length to the pleon, in 

 females somewhat longer. The urosome constitutes 1/4 the total body 

 length in females, in males is relatively smaller, i.e., up to 1/5 the body 

 length. The telson is half the length of the last (geminate) urosomite, its 

 tip reaching the tips of the rami of uropods III. 



Distribution: A less numerous species, distributed in the tropical 

 waters of the three oceans; it is rarer in the Atlantic Ocean than in the 

 Pacific and Indian Oceans. It is also found in the Red Sea. 



412 4. Oxycephalus longipes Spandl, 1927 (Fig. 221) 



Spandl, 1927: 181. 



Size of females 11-12 mm. Male not known. 



