Opisthoncus bellus (Karsch, 1878)

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 410

Opisthoncus bellus (Karsch, 1878)

( Fig. 7 )

Eris bella: Karsch 1878: 22 .

Bianor bella: Rainbow 1911: 294 . Opisthoncus bellus: Żabka 1991: 44 .

Type material. 1M Syntype, Eris bella Karsch, ZMB 1789 , Australia: Sydney [NSW], Daemel leg.

Diagnosis. Cheliceral retromargins unidentate, both promarginal teeth of similar size, small. Each frontal spur small and cone-like, ventral one small and tooth-like ( Figs 7 B, E, F). Fangs with internal outgrowths. Differs from related O. barbipalpis by relatively shorter palpal tibia (about 65% of cymbium length) and truncate cymbium.

Description. Male syntype (in bad condition, Fig. 7 ), about 5 mm long. Cephalothorax broadest anteriorly (CW = 86% of CL), moderately high ( CH = 50% of CL), dark brown, covered with whitish and orange scales and distinct cheek-swellings below ALE ( Fig. 7 A). Surrounding of eyes almost black. Clypeus narrow, with numerous whitish setae, overhanging towards chelicerae ( Fig. 7 B). Chelicerae, endites and labium brown, their anterior margins yellow. Sternum round, pale brown, with scattered brown hairs. Abdomen ovoid, with dorsal scutum, covered with brown bristles and pallid scales, colour pattern of longitudinal pallid area (guanine deposits) on brown-orange background ( Figs 7 C–D). Venter greyish, spinnerets of similar colour. Legs orange-brown. Palpal organ ( Figs 7 G–J) yellow-brown, tegulum elliptic, embolus moderately long, set at about 7.30, spermophore not meandering (in the type-specimen the bulbus is abnormally twisted; in figures 7I –J its position has been reconstructed).

Dimensions. CL 2.40, CW 2.08, CH 1.20, AEW 1.56, PEW 1.60, EFL 0.88, AL 2.35, AW 1.76, L1 5.96 (1.60+1.40+1.44+0.96+0.56)

Female unknown.

Figures

FIGURE 7. Opisthoncus bellus (Karsch, 1878), male syntype. A: general appearance, dorsal view (with shape of cephalothorax); B: cephalothorax, frontal view (with chelicera); C – D: abdomen, lateral and dorsal views; E – F: chelicerae, ventral and lateral views; G – J: palpal organ, ventral and retrolateral views. Scale bars A, C, D: 1 mm; H, J: 0.25 mm.