Order Caligidea 



Four families of caligoid copepods were col- 

 lected from needlefishes: Caligidae, Anthosomati- 

 dae, Lernaeidae, and Lemaeoceridae. 

 FAMILY CALIGIDAE 



Seven species of Caligus plus Galigodes lacini- 

 atus were collected. 



Caucus tylosuri (Rangnekar) 



Figures 113 to 11(5 



Specimen.s- studied. — Two collections from Ty- 

 losimis crocodilns, one from Leyte, Philippines, 

 containing three females and one from North 

 Borneo containing a single female; one collection 

 from Tylosurits acys melanotus from Luzon, 

 Philippines, containing a single male and one col- 

 lection from T. acvs pa-cificitJ^ from Bahia Palmas, 

 Gulf of California, containing a single male. 



This copepod was described by Eangnekar in 

 1956 and at that time assigned to the genus Ttixo- 

 phonis. In 1961 Pillai transferred it to the genus 

 Oaligv!^. Eangnekar's primary reason for placing 

 this copepod in Tnxophoru^H was the jjresence of 

 small dorsal thoracic i^lates which she described 

 from females in her collections. Pillai was unable 

 to find these plates in his material and, thus, re- 

 assigned the species to Caligus. These plates could 

 not bo located on the specimens reported here. 



This copepod has been described and figured by 

 Eangnekar and Pillai so only a few points are 

 added to the existing descriptions. 



Female. — Body form as in figure 113. Total 

 length and greatest width of the specimen from 

 North Borneo 3.7 by 2.1 mm.; those from Leyte, 

 Philippines 3.3 by 2.0 mm., 3.4 by 2.0 mm., and 3.5 

 by 2.1 mm. 



Male. — Body form as in figure 114. Total length 

 and greatest width of the specimen from Luzon, 

 Philippines, 3.2 by 1.9 mm.; those from Gulf of 

 California 2.9 by 1.7 mm. Abdomen (fig. 115) 2- 

 segmented (not 1-segmented as stated by Eangne- 

 kar). Caudal rami (fig. 116) with six setae ar- 

 ranged as in figure. 



The following points concerning the description 

 should be corrected as follows. Eangnekar de- 

 scribed the endopod of leg 3 as 2-segmented and 

 stated "exo and endopods are well separated' by a 

 ciliated membrane." This "membrane" is actually 

 the first endopod segment, thus the endopod is 

 3-segmented. The 5th and 6th legs described by 

 Eangnekar are parts of leg 5 — the anterior lobe 



represents the exopod and the posterior lobe the 

 endopod. Leg 6 is represented by a single seta near 

 the junction of the genital segment and abdomen. 

 Re/nurks. — This copepod seems to be restricted 

 to needlefishes. It lias thus far not been reported 

 from the Atlantic Ocean. 



Caligus belones Kr0yer 



Figure 117 



Specimens studied. — A single collection contain- 

 ing 1 female from under the gill cover of a Belone 

 helonc taken in the Flbe Eiver plus the type-speci- 

 mens from B. vvlgar-is (=5. helone) borrowed 

 from the Universitetets Zoologiske Museum (Co- 

 penhagen). A lectotype has been selected and de- 

 posited in tlic above museum. An additional collec- 

 tion from P. argalus containing 1 female and 1 

 male. 



Total length and greatest width 5.7 by 2.1 mm. 

 Abdomen (fig. 117) 1.1 mm. long and 1-segmented. 

 Caudal rami large (384 fi by 266 /i), longer than 

 wide; outermost of three longest setae bent in- 

 wardly, longest seta 650 /* long. Sternal furca 

 spatulate, tines short. Leg 2 endopod with large 

 patch of hairs on outer distal corner of first seg- 

 ment, rows of hairs on outer edge of second seg- 

 ment, small patch of hairs on third segment near 

 junction of second and third segment. Leg 4 exo- 

 pod 2-segmented with lateral spine and three 

 terminal spines. Measurements of B. helone speci- 

 men. 



The specimens assigned to C. helones from the 

 dolphin Caryphaena equisetis by Wilson (1905) 

 were described as a new species {G. wilsoni) by 

 Delamare Deboutteville and Nuiies-Euivo in 1958. 



Caligus malabaricus Pillai 



Figure 118 



Specimens studied. — Two collections containing 

 five females from Ahlennes hians from Torres 

 Strait oif Northern Australia. Total length and 

 greatest width of the specimens 4.13 by 1.42 mm., 

 4.13 by 1.35 mm., 3.90 by 1.27 mm., 3.75 by 1.35 

 mm., and 3.60 by 1.35 mm. In the largest specimen 

 the genital segment is 1.27 by 1.12 mm. (longer 

 than wide). The abdomen in this same specimen 

 is 1.35 mm. long. Pillai (1961) provided a descrip- 

 tion with good figures of this species which he re- 

 ported from Tylosnnis crocodilus from India. In 

 addition to his description it should be noted that 

 the abdomen has a patch of spinules on the pos- 

 terior comers as indicated in figure 118. 



376 



U.S. FISH AND WILDLIFE SERVICE 



