Caligus Species A to D 



Figures 119 to 132, Plate 1 



In addition to the three species of CaJigus re- 

 ported above, the collections of copepods from 

 needlefislies included four additional sj^ecies of 

 Caligus. These collections generally contained only 

 one or two specimens of each species. Robert 

 Parker, Fisheries Research Board of Canada, is 

 currently revising the genus Caligiis. and in view 

 of his work we have not attempted to assign 

 names, new or otherwise, to these remaining four 

 species. Information is included here which may 

 facilitate determination of the status of these 

 species when the genus is better understood. 



Caligus sp. A. — Four collections containing six 

 females from the Gulf of Guinea, three from 

 Ahhnnes Mans and one from Tylosurus acus. 

 Total length and greatest width 3.8 by 1.7 mm. 

 Abdomen 2-segmented, posterior segment (fig. 

 119) with fine spinules on outer ventral corners 

 and a patch on the medial-ventral surface as in 

 figure. Caudal ramus 207 n. long and 124 /^ wide, 

 middle seta of longest three is 475 /x long. Sternal 

 furca (figs. 120 and 121) spatulate, tines of furca 

 (fig. 120) more divergent in specimen from T. acus 

 than in those (fig. 121) from A. Mans. Leg 2 

 endopod (fig. 122) with patch of six stout spines 

 on outer distal corner of first segment, rows of 

 stout, distally bent spines on outer border of second 

 .segment, and a few small spines near outer junction 

 of second and third segments on third segment. 

 Leg 4 exopod (fig. 123) 2-segmented; terminal 

 segment 366 ^ long with lateral spine 118 ^ long, 

 three terminal spines measure 242 /i, 148 /n, and 88 ix 

 from innermost to outermost. 



Caligus sp. 5.— One collection containing four 

 females from Strongylura notata from Sarasota, 

 Fla., and another collection containing one female 

 from Tylosurus acus pacificus from Cabo Blanco, 

 Peru. Total length and greatest width of Florida 

 specimen 3.8 by 1.9 mm. Total length and greatest 

 width of Peru specimen 4.7 by 2.1 mm. Abdomen 

 (fig. 124) 1-segmented, unomamented. Caudal 

 rami longer than wide 324 /u, by 236 /. ; longest seta 

 680 IX. Sternal furca (fig. 125) spatulate. Leg 2 

 endopod (fig. 126) with patch of hairs on outer 

 distal corner of first segment, rows of hairs on 

 outer edge of second segment, and a patch of hairs 

 on third segment. Leg 4 (fig. 127) exopod 2-seg- 

 mented; terminal segment with no lateral spine, 



three terminal spines 254 fi, 195 /x, and 116 /*, respec- 

 tively, each with a prominent basal hood. 



Caligus sp. C. — Two collections containing three 

 females from Tylosurus acus pacificus and T. 

 crocodilus fodi-ator from the Pacific side of 

 Panama. Total length and greatest width 3.5 by 

 1.3 mm. This copepod is similar to Caligus sp. A in 

 most respects including the presence of .spinules 

 on the ventral surface of the last abdominal seg- 

 ment. It differs from sp. A, however, in having 

 only two prominent spines on the outer distal cor- 

 ner of the first endopod segment of leg 2 (fig. 128) . 



Caligus sp. D. — Two collections from the Philip- 

 pines from Strongylura incisa and S. unnllii, each 

 containing one female and a single collection con- 

 taining one female from Tylosurus chormn from 

 the Red Sea. Total length and greatest width of 

 specimen from ^V. incisa, 7.7 by 3.1 mm. Abdomen 

 (fig. 129) 1-segmented and unarmed. Caudal rami 

 small, slightly longer than wide (189 fx by 165 ;u), 

 longest seta 502 fx.. Sternal furca (fig. 130) spatu- 

 late. Endopod of leg 2 (fig. 131 ) with patch of thin 

 spines on outer corner of first segment, a row of 

 thin spines along outer margin of second segment, 

 and a few thin spines on third segment near outer 

 basal corner. Leg 4 (fig. 132) exopod 2-segmented; 

 terminal segment with a lateral spine, longest 

 tei-minal spine about twice length of each of other 

 two (230 III). 



Caligodes laciniatus (Kr0yer) 



Figures 133 to 145, Plate 2 



Specimens studied. — A total of 374 individuals 

 from 94 collections from 7 host species. The host 

 and locality data are provided below: Ablennes 

 Mans, off Pensacola, Fla.; Florida Keys; Padre 

 Bank, Caribbean Sea; off Mississippi coast; off 

 Surinam ; off northern Brazil ; Cape Verde Islands 

 (2 collections); Gulf of Guinea (5 collections); 

 off Sierra Leone (2 collections) ; Angola; Mauri- 

 tius; Zanzibar; Japan (2 collections); Hawaii; 

 off western Mexico (3 collections) ; off Peru (2 

 collections) ; Strongylura leiura, off Pondicherry, 

 India; off Fonnosa; Philippines (3 collections) ; 

 Platybelome argalus, Maldive Islands; Lhotskia 

 gai'ialoides, off northern Australia (5 collections) ; 

 Tylosurus acus, off southeast United States (5 col- 

 lections) ; Gulf of Mexico (7 collections) ; Haiti; 

 Virgin Islands; Gidf of Guinea; off Angola (2 col- 

 lections) ; Philippines (4 collections); Japan; 



378 



U.S. FISH AND WILDLIFE SERVICE 



