Opisthoncus necator L. Koch, 1881

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 430

Opisthoncus necator L. Koch, 1881

( Fig. 20 )

Opisthoncus necator: Koch L. 1881: 1237 ; Rainbow 1911: 309; Żabka 1991: 45.

Type material. 1M Syntype, ZMH, Mus. Godeffroy 7727, Australia: Sydney [NSW].

Remarks. Of 2 males (Sydney and Rockhampton), designated as syntypes. only one corresponds with the original description and drawings. The second represents O. magnidens .

Diagnosis. Male cheliceral retromargin pluridentate, with 3 similar teeth, promarginal teeth of different size, the distal one strongly enlarged ( Fig. 20 F). Frontal spurs well developed and cone-shaped, ventral ones flat, lobelike and enlarged ( Fig. 20 D, F). Fangs with internal outgrowths. Differs from similar O. magnidens by shorter embolus, arising at 5 o’clock.

Description. Male ( Fig. 20 ) about 6.5 mm long. Cephalothorax round and moderately high (CW = 88% of CL, CH = 50% of CL), brown, with yellow areas behind AME and PLE, densely covered with pale hairs and scattered brown bristles ( Figs 20 B, D). Surrounding of eyes black. Clypeus narrow, yellow, with pallid hairs ( Fig. 20 E). Cheliceral armament as in diagnosis. Chelicerae, endites and labium yellow-brownish. Sternum relatively wide, yellow, with darker margins, clothed in fine orange and pallid hairs ( Fig. 20 C). Abdomen elongate, yellow, darker on sides, with longitudinal, serrated, pallid streak on orange background, covered with scattered brown hairs. Venter yellow, with elongate stripes of small greyish spots. Spinnerets yellow. Palpal organ ( Figs 20 G–J) with embolus retrolaterally set, translucent part of spermophore not meandering, tibia about 55% of cymbium length.

Dimensions. CL 2.76, CW 2.44, CH 1.40, AEW 1.64, PEW 1.76, EFL 0.96, AL 3.52, AW 2.08, L1 8.76 (2.32+1.80+2.40+1.44+0.80).

Female unknown.

Figures

FIGURE 20. Opisthoncus necator L. Koch, 1881, male syntype. A: original drawings from Koch & Keyserling (1881); B – C: general appearance, dorsal (with shape of cephalothorax) and ventral views; D – E: cephalothorax, dorso-frontal (with chelicera) and frontal views; F: chelicerae, ventral view; G – J: palpal organ, ventral and retrolateral views. Scale bars B – D: 1 mm; H, J: 0.2 mm.