Arrenurus (Brevicaudaturus) postmai Smit, 2003

Smit, Harry, 2010, Australian Arrenurus (Acari, Hydrachnidia) with the description of eleven new species, Zootaxa 2541, pp. 1-26 : 17

Arrenurus (Brevicaudaturus) postmai Smit, 2003

( Figs. 11A–C )

Material examined. Queensland. 1/0/0, Rock pool Porcupine Creek, Porcupine Gorge NP, 20° 21.039 S 144° 27.852 E, 23 October 2005; 0/2/1, Porcupine Creek, Porcupine Gorge NP, same coordinates as previous location, 23 October 2005.

Description. Female. Idiosoma 1508 (1447) long and 1411 (1367) wide, yellowish brown. Dorsal shield complete, somewhat angular laterally, 905 (844) long and 955 (925) wide. D1 and D3 on large humps ( Fig. 11A, C ). Medial margin of fourth coxal plates larger than medial margin of third coxal plates. Medial distance of fourth coxal plates larger than width of gonopore. Gonopore 142 long and 168 wide, without chitinized patches. Genital plates long and bowed ( Fig. 11B ), width of genital field 945. Lengths of PI-PV: 48, 134, 76, 144, 52. Palp as in male, PII medially with five heavy setae. Lengths of I-leg-4-6: 235, 235, 300. Lengths of IV-leg-4-6: 324, 300, 223. Second, third and fourth legs with numerous swimming setae, first legs with less swimming setae.

Remarks. The female of A. postmai is close to A. laticodulus , but differs in smaller or absent humps of L4 and V3.

Distribution. Previously only known from the holotype male from The Kimberley, Western Australia, and reported here for the first time from Queensland.

Figures

FIGURE 11 A – C. Arrenurus postmai Smit, female: A = dorsal view; B = ventral view; C = lateral view. Scale bar = 200 µm.