Opisthoncus rubriceps (Thorell, 1881)

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 439

Opisthoncus rubriceps (Thorell, 1881)

( Fig. 26 )

Marptusa rubriceps: Thorell 1881: 437 . Trite rubiceps: Simon, 1903: 829 .

Opisthoncus rubiceps: Żabka 1991: 47 .

Type material. 1M Holotype, MCSNG, Australia: Somerset, Cape York [Queensland], leg. L. M. D’Albertis.

Diagnosis. Male cheliceral promarginal teeth vary in size ( Figs 26 B, D). Retromargins of unclear pattern, with 4–5 teeth. Frontal spurs conical ( Fig. 26 B). Ventral spurs flat, small, located close to the proper retromarginal teeth ( Fig. 26 D). Tegulum elliptic, narrow, embolus moderately long, arising at about 6 o’clock. Differs from other species by combination of palpal organ details and cheliceral armament.

Description. Male ( Fig. 26 ) about 6 mm long. Cephalothorax moderately round (CW = 85% of CL) and rather flat ( CH = 42% of CL), light brown, covered with fine, pallid scales ( Figs 26 A–C). Surrounding of eyes black. Clypeus very narrow, light brown, covered with sparse pallid setae ( Fig. 26 B). Chelicerae pale brown, endites and labium orange-yelow, sternum relatively wide, yellow. Abdomen elongate, yellow with orange dorsal scutum, colour pattern rather indistinct ( Fig. 26 A). Venter yellowish, with elongate stripes of small grey dots. Spinnerets yellow. Legs I brown, others orange-brownish. Palpal organ ( Figs 26 E–G): tegulum elliptic, moderately narrow, embolus set distally, translucent part of spermophore not meandering, tibia 47% of cymbium length, retrolateral tibial apophysis moderately long.

Dimensions. CL 2.40, CW 2.05, CH 1.00, AEW 1.40, PEW 1.50, EFL 0.85, AL 3.65, AW 1.55, L1 7.55 (2.05+1.60+2.00+1.25+0.65)

Female unknown.

Figures

FIGURE 26. Opisthoncus rubriceps (Thorell, 1881), male holotype. A: general appearance, dorsal view; B – C: cephalothorax, fronto-lateral (with chelicera) and dorsal views; D: chelicerae, ventral view; E – G: palpal organ, retrolateral and ventral views. Scale bars A, C: 1 mm; E, G: 0.2 mm.