Australian Arrenurus 
243 
Figures 30-34 Arrenurus (Megaluracarus) gilmts sp. nov., holotype 6 (unless stated otherwise): 30, ventral view; 31, 
dorsal view; 32, lateral view; 33, palp; 34, ventral view, paratype 9. Scale lines, 50 pm (Figure 33), 200 
pm (Figures 30-32, 34). 
Lengths of I-leg-4-6: 126, 136, 141. Lengths of IV- 
leg-4-6: 189, 131, 165; IV-leg-4 with a short, 
truncated spur. 
Female 
Body 878 long and 708 wide. Body colour 
brownish yellow. Anterior body margin rounded. 
Posterolateral corners of body indistinct. Medial 
margin of CX4 larger than medial margin of CX3. 
Medial distance of CX4 larger than width of one 
genital valve. Genital valves without chitinous 
patches. Genital plates short and rounded, sloping 
posteriorly (Figure 34). Lengths of Pl-PV: 31, 67, 
41, 67, 29; palp as in male. Lengths of I-leg-4-6: 116, 
145,136. Lengths of IV-leg-4-6:160,165,170. 
Remarks 
A number of females have genital plates similar 
to those of A. gilvus, e.g. A. vanderpalae, A. caeruleus 
sp. nov. and A. thienemanni. The last two species 
differ in having a blue body colour, while the 
female of A. vanderpalae is larger and has more 
angular genital plates. 
Etymology 
Named for the light-yellow colour of the male. 
Arrenurus (Megaluracarus) thienemanni K.O. 
Viets 
Figures 41-44; 74 
Arrenurus thienemanni K.O. Viets, 1984: 432. 
Material Examined 
Holotype 
6, Roper Valley, Station spring. Northern 
