Opisthoncus alborufescens L. Koch, 1880

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 407

Opisthoncus alborufescens L. Koch, 1880

( Fig. 5 )

Opisthoncus alborufescens: Koch L. 1880: 1197 ; Simon 1903: 826, 828; Rainbow 1911: 308, 1912: 202; Żabka, 1991: 44.

Type material. 3F Syntypes, ZMH, Mus. Godeffroy 7740, Australia: Rockhampton [Queensland].

Remarks. Koch and Keyserling (1880) described both sexes and listed following localities: Rockhampton, Gayndah, Port Mackay, Sydney, Peak Downs. The material studied here comprises 3 females, designated as syntypes from Rockhampton. The male type specimen is lacking.

Diagnosis. Characterized by the following combination of features: female cheliceral retromargin with 4–5 fused teeth ( Fig. 5 F); copulatory openings wide, oriented mid-anteriorly, posterior notch triangular, moderately deep; insemination ducts proximally membranous and wide, narrowing distally, coiled in two circles, intermediate ducts long and looped as in Fig. 5 J spermathecae small, accessory glands enlarged. Distinctive from close O. grassator by orientation of spermathecae.

Description. Female ( Fig. 5 ) about 5.5 mm long. Cephalothorax round, moderately high (CW = 85% of CL, CH = 50% of CL), pale brown and covered with short, pallid scales, frontal scales make oblique bands ( Figs 5 C– D). Surrounding of eyes black. Clypeus moderately narrow, brown, densely covered with pallid scales and hairs ( Fig. 5 B). Chelicerae, endites and labium brown, the latter with yellow anterior margins. Sternum round, orange, with scattered fine, pallid and brown hairs. Abdomen damaged and somewhat dried, colour pattern as in Figs 5 G– H. Spinnerets orange. Legs I orange, others yellow. Epigyne as in Figs 5 I–J.

Dimensions. CL 2.40, CW 2.04, CH 1.20, AEW 1.56, PEW 1.68, EFL 0.84, AL 3.12, AW 1.76, L1 4.88 (1.36+1.12+1.12+0.84+0.44).

Size variation (n = 2): CL 2.24–2.48, CW 1.80–2.04, CH 1.04–1.20, AEW 1.52–1.60, PEW 1.56–1.68, EFL 0.80–0.84, AL 2.24–3.12, AW 1.32–1.76.

Male unknown (type specimen lacking).

Figures

FIGURE 5. Opisthoncus alborufescens L. Koch, 1880, female syntype. A: original drawings from Koch & Keyserling (1880); B – D: cephalothorax (frontal, dorsal and lateral views); E: leg I, prolateral view; F: chelicerae, ventral view; G – H: abdomen, dorsal and ventral views; I – J: epigyne and its internal structures. Scale bars B – E, H: 1 mm; I – J: 0.1 mm.