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.