6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



from the northwestern Atlantic Ocean and Caribbean Sea. So far, 

 it has not been collected from the sailfish Istiophorus americanus but 

 has been found on all other species of billfish examined. 



Gloiopotes huttoni (Thompson) 



Figures 27-37 



Lepeophtheirus huttoni Thompson, 1889, p. 354. — Wilson, 1907, p. 701. 



Gloiopotes huttoni Bassett-Smith, 1899, p. 440. — Rao, 1951, p. 254. — Shiino, 1954, 

 p. 278.— Yamaguti, 1963, p. 104.— Hewitt, 1964, p. 86. 



Caligus longicaudatus Marukawa, 1925, p. 1243; 1949, p. 927. 



Gloiopotes longicaudatus Shiino, 1954, p. 273; 1957, p. 364; 1958, p. 105; 1959, p. 

 348; 1903, p. 343.— Heegaard, 1963, p. 174.— Ho, 1963, p. 87.— Yamaguti, 

 1963, p. 104.— Hewitt, 1964, p. 94. 



Gloiopotes species Yamaguti, 1936, p. 4. 



Gloiopotes costatus Wilson, 1919, p. 313. — Yamaguti, 1936, p. 5 [spelled constatus]. — 

 Shiino, 1954, p. 277. — Heegaard, 1963, p. 174 [spelled constatus]. — Yama- 

 guti, 1963, p. 103.— Hewitt, 1964, p. 94. 



Gloiopotes zeugopteri Rao, 1951, p. 248. — Shiino, 1959, p. 349. — Yamaguti, 1963, 

 p. 104.— Hewitt, 1964, p. 95. 



Specimens studied. — Nine collections from Tetrapturus audax, 1 

 collection from Makaira indicus, 2 collections from Istiophorus orien- 

 talis, all from various sites in the Indian Ocean collected during the 

 International Indian Ocean Expedition; 2 collections from T. audax 

 collected off Peru during the Southeastern Pacific Biological Oceano- 

 graphic Program; 5 collections in the USNM labeled as G. costatus 

 from biMshes (labeled "swordfish" or "marlin") from the eastern 

 Pacific; 1 collection in the USNM from M. audax from Hawaii. 



Female. — Body form as in figure 27. Total length 13.75 mm 

 (11.70-15.15 mm); greatest width 6.20 mm (5.10-7.20 mm) based on 

 an average of 65 specimens. Specimens from /. orientalis tend to be 

 smaller (12.15 x 5.40 mm average) based on an average of 10 specimens. 



Dorsal surface of cephalon with rows of bifurcate hairs and spinules 

 arranged as indicated in figure. Dorsal thoracic segment bearing leg 

 4 with winglike plates. Lateral edges of plates held at an angle to 

 anterior-posterior axis of body. Genital segment (fig. 28) longer than 

 wdde (length from anterior shoulder to end of posterior lobe not 

 including leg 5). Lateral edges of genital segment vdih small spinules. 

 Dorsal surface of segment with 2 rows of prominent spines as in G. 

 ornatus and G. americanus. Posterior lobe of genital segment well 

 developed and projecting well beyond middle of leg 5. Abdomen 2- 

 segmented with spinules as in figure 28. Caudal rami (fig, 29) as in G. 

 ornatus and G. americanus. Sternal furca as in figure 30. 



Appendages as in G. ornatus and G. americanus. 



Male. — Body form and dorsal ornamentation in general like G. 

 ornatus and G. americanus. Total length 10.84 mm (10.05-12.75 



