Copepods from ground waters of Western Australia, II. 
83 
Figure 24 Location of the collection sites for Halicyclops longifurcatus sp. nov. (O) and H. spinifer (□) in northwestern 
Australia. The small dots denote sites where stygofauna was found. 
Etymology 
The specific epithet is derived from the 
remarkable length of the caudal rami, unusual for 
the species of Halicyclops. 
Halicyclops spinifer Kiefer, 1935 
Figures 12-24 
Material Examined 
Australia: Western Australia: 2 $ and 1 juv. 
(WAM 260-94 to 262-94), Mowbowra Well (BES 
2221), Cape Range peninsula, 22 n 00'S, 114"07'E, 9 
June 1993, R.D. Brooks; 1 2 (WAM 259-94), cave 
C-18 (BES 2372), Cape Range peninsula, 22°05'S, 
114°00'E, 12 July 1993, R.D. Brooks. 
Supplementary Description 
Body length, 540 pm (holotype), 550-560 pm (2 
paratypes). Hyaline fringes of all prosomites 
smooth. Genital double somite slightly longer than 
broad, with a well developed chitinous, sharp 
spine curved backward on each side. Hyaline 
fringes of genital double somite and two 
subsequent somites serrate; hyaline fringe of 
urosomite 4 well developed dorsally, with 
dorsomedial denticulations much longer and 
stouter than lateral ones. 
Caudal ramus about as long as broad; innermost 
apical seta difficult to distinguish from row of 
spinules along distal margin of ramus; outermost 
apical seta about as long or slightly longer than 
