NO. 3570 PANDARIDAE — CRESSET 15 



within genital segment (by itself, this might have been mistaken for 

 fully developed male). Examination of its appendages showed it to 

 be identical with its larger counterpart, except pad of second antenna 

 is about as long as pad of first antenna (408:420/^) (see fig. 60). Other 

 species of this genus with same reduction of adhesion pad of second 

 antenna in mature males. 



Discussion. — Pandarus floridanus is closely related to P. sinuatus 

 but the females can be readily separated on the basis of the following 

 differences. The dorsal abdominal plate of P. floridanus is consider- 

 ably longer than the dorsally exposed caudal ramus while in P. sinuatus 

 they are about equal in length (see table 1). In P. floridanus the 



Table 1. — Comparison of the length of the dorsal abdominal plates with the 

 length of dorsally exposed caudal ramus in some specimens of Pandarus flori- 

 danus with P. sinvatus (CHML=Cape Haze Marine Laboratory, Fla.) 



dorsal thoracic plate of segment 2 extends beyond the middle of the 

 plate of segment 4 while in P. sinuatus the plate of segment 2 does 

 not extend to the middle of the plate of segment 4. P. floridanus is 

 not so heavily pigmented as P. sinuatus. Young females of P. sinuatus 

 first show pigmentation in the lateral areas of the cephalon (see fig. 66), 

 whereas P. floridanus is not pigmented in this area at all (its young 

 females showmg first areas of pigmentation to be the anterior margin 

 of the cephalon). 



From Latin, the word floridanus refers to the fact that the species 

 was seen first on a shark from Florida. 



Pandarus floridanus can be separated from all other species of the 

 cranchii group on the basis of the spine and setal formula. The male 

 of P. floridanus is similar to that of P. sinuatus. Since only 1 mature 

 male of the new species was available, a more detailed comparison 

 could not be made. 



This species seems to be a well-established parasite on the body 

 surface of Carcharodon carcharias since it was recovered from that host 



