COPEPOD CRUSTACEANS — LEWIS 



125 



Distribution and hosts. — 20 host records: 



locality 

 Western North Atlantic 



Subtropical Atlantic 



Gulf of Mexico 



Eastern Pacific 



Japan 



Indian Ocean 

 Mediterranean 



hosts 

 Bonito 



Gymnosarda pelarnis 

 Cyhiuin 



Katsxiwonus pelarnis 

 Pomatomas saltatrix 

 Scomberomorus maculaius 

 Lutianus grisens 

 Mugil cephalus 

 Oligoplites saurus 

 Scomberomorus cavalla 

 Gymnosarda alleterato 

 Sarda sarda 

 Sarda chilensis 

 ILutjanus species 

 Katsuwonus pelarnis 

 Euthynnus pelarnis 

 Katsuwonus pelarnis 

 Thunnus thynnus 

 Euthynnus affinis 

 Pelamys sarda 



references 

 Wilson, 1905b 

 Rathbun, 1905 

 Brian, 1924 

 Nunes-Ruivo, 1956 



Bere, 1936 

 Causey, 1953a 

 Causey, 1953b 



Causey, 1960 

 Shiino, 1963a 

 Yamaguti, 1936a 



Shiino, 1959c 

 Pillai, 1963 

 Brian, 1935 



Material.— Three females (USNM 112911) from the gill cavity 

 of several specimens of Katsuwonus pelamis (Linnaeus.) captured 

 100 miles north of Oahu, Hawaii (USFWS). 



Measurements. — (In mm) 3 females: 



Total length, excluding caudal setae 6.20, 6.50, 6.45 

 Length of cephalothorax, including 



frontal region 2.70, 3.05, 3.10 



Width of cephalothorax 2.50, 2.85, 2.85 



Length of genital segment 2.00, 2.05, 2.00 



Width of genital segment 1.50, 1.35, 1.60 



Length of abdomen 1.25, 1.35, 1.25 



Length of caudal rami 0.19, 0.20, 0.22 

 Length of egg strings (all 3 nonovigerous) 



Description of female. — Cephalothorax (fig. 46a) ovoid, con- 

 sisting of cephalon and first 4 thoracic segments. Frontal region 

 approximately one-tenth the total length of cephalothorax, with 

 fine membrane along anterior margin. Lunules distinct, slightly 

 longer than greatest length of frontal region. Lateral cephalotho- 

 racic margin slightly irregular, with narrow membrane projecting 

 laterally and second projecting medially. Posterior lateral sm-face 

 with small indentation. Posterior sinus (fig. 466) U-shaped, with 

 fine membrane along outer margin. Posterior medial surface extend- 

 ing posteriorly slightly past lateral cephalothoracic regions, with 

 narrow, median projection covering junction of cephalothorax and 

 free fourth pedigerous segment. Major dorsal cephalothoracic 



