Australian Arrenurus 
251 
Arrenurus (Micruracarus) purpureus sp. nov. 
Figures 56-60 
Material Examined 
Holotype 
6, Pond Snake Creek, Millstream-Chichester 
National Park, Western Australia, Australia, 17 
August 1994 (WAM). 
Par a types 
Australia: Western Australia: 2 d, 13 9, same 
data as holotype (ZMA); 1 9, Pond Kalamina Falls, 
near falls, Hamersley Range National Park, 13 
August 1994 (WAM); 2 6,7 9, Palm Pool, 
Millstream-Chichester National Park, 15 August 
1994 (WAM); 1 9, Chinderwariner Pool, 
Millstream-Chichester National Park, 15 August 
1994 (ZMA); 1 6, Crossing Pool, Millstream- 
Chichester National Park, 16 August 1994 (ZMA); 
4 9, small pond near Crossing Pool, Millstream- 
Chichester National Park, 16 August 1994 (NTM); 
1 9, Python Pool, Millstream-Chichester National 
Park, 17 August 1994 (ZMA); 2 <3, Jones River, E. 
of Roeburne, 17 August 1994 (WAM); 2 d, 
Fortescue River at crossing with Highway, 18 
August 1994 (NTM); 1 2, Ashburton River, at 
crossing with North West Coastal Highway, 18 
August 1994 (WAM). 
Diagnosis 
Body colour purple. Male with a closed median 
cleft and a dagger-like petiole. Females with short 
and bowed genital plates. 
Description 
Male 
Body 640 (592-660) long and 510 (456-524) wide. 
Body colour purple. Anterior margin of body 
slightly concave. Dorsal furrow complete, dorsal 
shield 359 (310-373) long. D1 on small humps. 
Cauda short, indistinctly set off from body, with a 
dosed median cleft. Cauda posterolateral indented, 
forming four lobes (Figure 57). Medial margin of 
CX4 longer than medial margin of CX3. Just 
anterior of petiole two fused tubercles. Petiole 
simple, dagger-like. Gonopore 43 long. Genital 
plates bowed, not extending to lateral body margin 
(Figure 56). Lengths of PI-PV: 26, 53, 36, 67, 34; PII 
with 3 setae on medial side (Figure 58). Lengths of 
I-leg-4-6: 107, 107, 116. Lengths of IV-leg-4-6: 146, 
102, 126; IV-leg-4 with a spur. 
Female 
Body 737 (689-873) long and 621 (592-723) wide. 
Anterior body margin slightly concave. 
Posterolateral corner of body indistinct. Dorsal 
shield 582 (534-669) long and 480( 412-504) wide. 
Dorsum without humps. Medial margin of CX4 
larger than medial margin of CX3. Medial distance 
of CX4 smaller than width of one genital valve. In 
some specimens the posteromedial comer of CX4 
is almost absent (Figure 60). Gonopore 111 long, 
genital valves without chitinous patches. Genital 
plates short and narrow, (slightly) bowed (Figure 
59). Lengths of PI-PV: 36, 74, 46, 62, 34; PII with 4 
setae on medial side. Lengths of I-leg-4-6: 107,116, 
107. Lengths of IV-leg-4-6: 155, 160, 131. 
Etymology 
The species is named for its purple colour. 
Arrenurus (Micruracarus) separatus sp. nov. 
Figures 61-64 
Material Examined 
Holotype 
<3, Pond Dales Gorge, Hamersley Range National 
Park, Western Australia, Australia, 12 August 1994 
(WAM). 
Diagnosis 
Male without cauda, pygal lobes and petiole; 
body posteriorly with a concavity, with a 
complicated structure; genital plates separated 
medially, not fused with gonopore. 
Description 
Male 
Body 587 long and 495 wide. Body colour 
yellowish brown, legs purple. Anterior body 
margin convex. Cauda, pygal lobes and petiole 
absent (Figure 62). Dorsal furrow incomplete, 
passing onto posterior body part. Body posteriorly 
with a concavity, in which a complicated structure 
is visible, which is better illustrated than described 
(Figure 63). Posterior body margin with a small 
notch. Gonopore 29 long. Genital plates separated, 
not fused with gonopore (Figure 61). Lengths of 
PI-PV: 41, 110, 70, 103, 49; PII with two setae on 
medial side (Figure 64). Lengths of I-leg-4-6: 111, 
126, 97. Lengths of IV-leg-4-6: 160, 131, 136; IV-leg- 
4 without a spur; third and fourth legs with 
numerous swimming setae. 
Female 
Unknown. 
Etymology 
Named after its separated genital plates. 
Arrenurus (Rhinophoracarus) gracilipes Piersig 
Arrhenurus gracilipes Piersig, 1906: 370. 
Rhinophoracarus gracilipes Piersig: K. Viets, 1935: 2; 
Lundblad, 1969: 392. 
