Opisthoncus albiventris L. Koch, 1881

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

Opisthoncus albiventris L. Koch, 1881

( Fig. 4 )

Opisthoncus albiventris: Koch L. 1881: 1228 ; Rainbow, 1911: 308; Żabka 1991: 44.

Type material. 1F Syntype, ZMH, 7725, Mus. Godeffroy, Australia: Sydney [NSW].

Remarks. Koch and Keyserling (1881) described both sexes from Sydney. The material labelled as “ type ” includes 2 females, but only one of them corresponds with the original description. The second female belongs to O. keyserlingi (previously Hasarius albiventris ).

Diagnosis. Differs from close O. parcedentatus by the course of insemination ducts and orientation of spermathecae. Copulatory openings relatively small, oriented mid-anteriorly, posterior notch rounded, slightly concave. Membranous parts of insemination ducts coiled in one circle, intermediate ducts relatively short, curved and looped as in Fig. 4 H.

Description. Female ( Fig. 4 ) about 5 mm long. Cephalothorax moderately narrow and high (CW = 75% of CL, CH = 46% of CL), pale brown, sparsely covered with short, pallid scales ( Figs 4 B,C). Surrounding of eyes black. Clypeus moderately wide, pale brown, covered with numerous pallid scales and setae, longer and denser in the centre ( Fig. 4 E). Cheliceral retromargin with 2-cuspidate fissident tooth ( Fig. 4 F). Chelicerae, endites and labium pale brown, the latter with yellow anterior margins. Sternum moderately round, orange, clothed in scattered fine, pallid hairs ( Fig. 4 D). Abdomen yellowish-orange, with medial longitudinal whitish area and pattern of transverse whitish stripes and brown spots as in Fig. 4 C. Venter whitish, with visible guanine deposits and brown stripes along the sides ( Fig. 4 D). Spinnerets yellow. Legs I, II with coxae and femora yellow and other podomeres orange. Other legs yellow. Pedipalps yellow with orange tarsi. Epigyne as illustrated in Figs 4 G–H.

Dimensions. CL 2.24, CW 1.68, CH 1.04, AEW 1.56, PEW 1.60, EFL 0.80, AL 2.80, AW 1.44.

Male unknown (type specimen lacking).

Figures

FIGURE 4. Opisthoncus albiventris L. Koch, 1881, female syntype. A: original drawings from Koch & Keyserling (1881); B – D: general appearance, dorsal view (with shape of cephalothorax), lateral and ventral views; E: cephalothorax, frontal view; F: chelicerae, ventral view; G – H: epigyne and its internal structures. Scale bars C, D: 1 mm; G – H: 0.1 mm.