Opisthoncus barbipalpis (Keyserling, 1882)

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

Opisthoncus barbipalpis (Keyserling, 1882)

( Fig. 6 )

Hyllus barbipalpis: Keyserling 1882: 1344 . Chalcotropis barbipalpis: Simon 1903: 788 . Opisthoncus barbipalpis: Żabka 1991: 44 .

Type material. 1M Holotype, Hyllus barbipalpis , ZMH, Mus. Godeffroy 8641, Australia: Gayndah [Queensland].

Diagnosis. Male cheliceral retromargins unidentate, both promarginal teeth of similar size, small. Frontal spurs small and cone-like, ventral ones small and lobe-like ( Figs 6 B, E). Fangs with internal outgrowths ( Fig. 6 B). Tegulum elliptic, embolus moderately long, arising at 7 o’clock, spermophore not meandering, palpal tibia elongate. In comparison with similar O. bellus palpal organ more slender, with tibia relatively longer (its length about 80% of cymbium length).

Description. Male ( Fig. 6 ) about 7 mm long. Cephalothorax broadest anteriorly (CW = 86% of CL), with strongly developed cheek swellings, moderately high ( CH = 51% of CL), brown, covered with fine, short, pallid hairs ( Figs 6 A, C). Surrounding of eyes almost black. Clypeus narrow, with numerous whitish setae, overhanging its ventral edge ( Fig. 6 B). Chelicerae, endites and labium brown, anterior margins of endites and labium yellow. Sternum round, orange, clothed in fine, short and brown hairs. Abdomen cylindrical, yellow, with orange dorsal scutum (mostly discoloured, therefore colour pattern rather invisible), covered with sparse, brown hairs and mostly rubbed pale scales ( Figs 6 A, D). Venter dark yellow. Spinnerets orange. Legs I brown, others orange with brownish femora. Pedipalps orange, tinted brown. Palpal organ as in Figs 6 F–I.

Dimensions. CL 3.36, CW 2.88, CH 1.72, AEW 2.04, PEW 2.08, EFL 1.20, AL 3.76, AW 1.68, L1 9.44 (2.44+2.20+2.40+1.56+0.84)

Female unknown.

Figures

FIGURE 6. Opisthoncus barbipalpis (Keyserling, 1882), male holotype. A: general appearance, dorsal view (with shape of cephalothorax); B – C: cephalothorax, frontal (with chelicerae), and fronto-lateral views; D: abdomen, lateral view; E: chelicera, ventral view; F – I: palpal organ (ventral and retrolateral views). Scale bars A, D: 1 mm; F, I: 0.15 mm.