Australian Arrenurus 
249 
differ in broader genital plates and the absence of 
posterolateral comers of the body. A. forpicaloides 
has shorter genital plates. 
Etymology 
Named after the type locality. 
Arrenurus (Micruracarus) jabiruensis sp. nov. 
Figures 51-55 
Material Examined 
Holotype 
8, Lake Jabiru, Jabiru, Northern Territory, 
Australia, 20 July 1994 (NTM). 
Para types 
Australia: Northern Territory: 1 8, 5 2, Lake 
Jabiru, Jabiru, 20 July 1994 (ZMA); 2 2, Pond in 
Jim Jim Creek, at Jim Jim Crossing, Kakadu 
National Park, 22 July 1994 (NTM); 1 2, 1 nymph. 
Small Billabong, Yellow Waters, Kakadu National 
Park, 22 July 1994 (NTM); 1 2, Jim Jim Billabong at 
crossing with Kakadu Highway, Kakadu National 
Park, 22 July 1994 (NTM); 1 2, Manton Dam, 1 
August 1994 (WAM). 
Diagnosis 
Cauda of male with a cleft, petiole chisel-shaped; 
posterior margin of cauda slightly indented. 
Female with a truncated posterior body part, 
posterior body margin straight. 
Description 
Male 
Body 650 (698) long and 524 (550) wide. Body 
colour blue-green. Dorsal furrow complete, dorsal 
Figures 51-55 Arrenurus (Micruracarus) jabiruensis sp. nov., holotype 8 (unless stated otherwise): 51, ventral view; 52, 
dorsal view; 53, lateral view; 54, palp; 55, ventral view, paratype 9. Scale lines, 50 pm (Figure 54), 200 
pm (Figures 51-53, 55). 
