Opisthoncus devexus Simon, 1909

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 413-417

Opisthoncus devexus Simon, 1909

( Fig. 10 )

Opisthoncus devexus: Simon 1909: 205 ; Rainbow 1911: 309; Żabka 1991: 45.

Type material. 1M neotype, MNHN 24309, Austral. occid (Michaelsen), Western Australia; 1juv. ZMH 67, Dr. W. Michaelsen, ded. 1X.1909., Hambg. S.W. Austral. Exp. 1905, Dirk Hartog, Brown Station, 7.VI.1905.

Remarks. The type specimen described by Simon (1909) has originally been deposited in Godeffroy Museum in Hamburg; currently only juvenile female [indentified as O. devexus ] occurs there. The male deposited in the Muséum National d’Histoire Naturelle (Paris) corresponds with the original description. We consider it the neotype.

Diagnosis. In comparison with similar O. parcedentatus cephalothorax more round; both teeth on cheliceral promargins of similar size ( Fig. 10 D). Each frontal spur finger-like ( Figs 10 C, E), ventral spur lobe-like, relatively small and adjoined the proper retromarginal unidentate tooth, palpal tibia relatively shorter (less than 50% of cymbium length).

Description. Male ( Fig. 10 ) about 5 mm long. Cephalothorax ( Figs 10 A–C) round and moderately high (CW = 88% of CL CH = 49% of CL), brown with eye field somewhat paler, clothed in scattered brown bristles and pale scales. Surrounding of eyes almost black. Clypeus narrow, pale brown, covered with pallid hairs. Cheliceral retromargin of unidentate pattern ( Fig. 10 D). Chelicerae, endites and labium brown, the latter with yellow anterior margins. Sternum moderately round, yellow, with scattered brownish hairs ( Fig. 10 F). Abdomen elongate ovoid, yellow, with scattered brown bristles and colour pattern of longitudinal pallid area on orange background. Venter yellowish, with elongate brownish stripes on sides. Spinnerets orange. Legs brown-orange, first pair darker than others. Palpal organ ( Figs 10 G–J) orange, embolus long and arising at 7 o’clock, tegulum moderately narrow, translucent part of spermophore not meandering, palpal tibia short (about 45% of cymbium length).

Dimensions. CL 2.05, CW 1.83, CH 1.00, AEW 1.40, PEW 1.45, EFL 0.80, AL 2.80, AW 1.58, L1 5.23 (1.50+1.13+1.25+0.85+0.50).

Female unknown.

Figures

FIGURE 10. Opisthoncus devexus Simon, 1909, male neotype. A – B: general appearance, dorsal (with shape of cephalothorax) and lateral views; C: cephalothorax, fronto-lateral view (with chelicera); D – E: chelicerae, ventral and lateral (with frontal spur, see arrow) views; F: sternum; G – J: palpal organ, ventral and retrolateral views. Scale bars A, B, F: 1 mm; H, J: 0.2 mm.