Opisthoncus lineativentris L. Koch, 1880

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 420

Opisthoncus lineativentris L. Koch, 1880

( Fig. 14 )

Opisthoncus lineativentris: Koch L. 1880: 1185 ; Peckham & Peckham 1886: 309; Simon 1903: 828; Rainbow 1911: 309; Żabka, 1991: 45.

Type material. 1M Syntype, ZMH, Mus. Godeffroy 7734, Australia: Rockhampton [Queensland].

Remarks. Koch and Keyserling (1880) described both sexes, the available material is represented only by male syntype.

Diagnosis. Both male cheliceral promarginal teeth small, retromargin unidentate ( Fig. 14 F). Frontal cheliceral surface with sclerotized anterior ridge, terminated by small, vestigial spur ( Fig. 14 E). Ventral spurs enlarged, lobelike ( Fig. 14 F). Fangs with internal and external outgrowths ( Fig. 14 E–F). Sternum relatively narrow ( Fig. 14 D). Tegulum elliptic, embolus moderately long, arising at 6 o’clock. Differs from similar O. mandibularis by the shape of ventral spurs and slightly meandering translucent part of spermophore.

Description. Male ( Fig.14 ) about 8.5 mm long. Cephalothorax trapezoid, broadest at PLE level (CW = 84% of CL) and moderately low ( CH = 44% of CL), pale brown, covered with scattered fine, brown hairs ( Figs 14 B–C). Surrounding of PLE black, others surrounded brown. Clypeus moderately narrow, dark brown, densely covered with long, pallid setae ( Fig. 14 B). Chelicerae pale brown, with scattered brown hairs, armament as in diagnosis. Endites and labium orange with yellow anterior margins. Sternum yellow. Abdomen elongate-ovoid, yellow, sparsely covered with brown hairs and with pattern of longitudinal pallid area, bordered with brownish colour. Venter yellowish, somewhat darker on sides and centrally ( Fig. 14 D). Spinnerets dark yellow. Legs orange, with darker femora. Pedipalps orange, brown haired. Palpal organ ( Figs 14 G–J) tegulum moderately narrow, embolus distally set, spermophore slightly meandering, tibia about 75% of cymbium length, retrolateral tibial apophysis slender.

Dimensions. CL 3.60, CW 3.04, CH 1.60, AEW 2.42, PEW 2.60, EFL 1.28, AL 4.80, AW 2.48, L1 13.52 (3.60+3.00+3.60+2.20+1.12).

Female unknown (type specimen lacking).

Figures

FIGURE 14. Opisthoncus lineativentris, L. Koch, 1880, male syntype. A: original drawings from Koch & Keyserling (1880); B: cephalothorax, fronto-lateral view; C – D: general appearance, dorsal (with shape of cephalothorax) and ventral views; E – F: chelicerae, frontal and ventral views; G – J: palpal organ, ventral and retrolateral views. Scale bars C, D: 1 mm; G, H, J: 0.15 mm.