Opisthoncus tenuipes (Keyserling, 1882), Keyserling, 1882

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447: 442-444

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Opisthoncus tenuipes (Keyserling, 1882)


Opisthoncus tenuipes (Keyserling, 1882)  

( Fig. 29 View FIGURE 29 )

Hyllus tenuipes: Keyserling 1882: 1342   .

Opisthoncus tenuipes: Simon 1903: 826   , 828, 829; Żabka, 1991: 47.

Type material. 1 M, 1 juv. Syntypes, ZMH, Mus. Godeffroy 8640, Australia: Brisbane [Queensland].

Diagnosis. Male cheliceral promargins with distal tooth larger than the proximal one, retromargins unidentate ( Fig. 29 View FIGURE 29 F). Frontal male cheliceral surface with sclerotized ridge, terminating with vestigial spur ( Fig. 29 View FIGURE 29 E). Ventral spurs teeth-like, enlarged and located near fangs, the latter with dorsal and external outgrowths ( Fig. 29 View FIGURE 29 F). Differs from other species mainly by armament of male chelicerae (as above) and palpal organ structure, with embolus short, arising at 12 o’clock and retrolateral tibial apophysis dorsally bent. Abdomen with colour pattern similar to the females of O. abnormis   and O. keyserlingi   .

Description. Male ( Fig. 29 View FIGURE 29 ) about 5 mm long. Cephalothorax moderately round and high (CW = 85 % of CL, CH = 53 % of CL), brown, eye field lighter and covered with pallid scales ( Figs 29 View FIGURE 29 B –C). Surrounding of eyes black, except of AME, which are brown. Clypeus moderately narrow, pale brown, clothed in scattered pallid scales and setae ( Fig. 29 View FIGURE 29 E). Chelicerae brown, with armament as in diagnosis. Maxillae and labium dark brown with yellow anterior margins. Sternum relatively narrow, orange ( Fig. 29 View FIGURE 29 D). Abdomen elongate, yellow-brown, with herring-bone pattern on brownish background as in Fig. 29 View FIGURE 29 B. Venter yellowish, darker on sides, with elongate stripes of small orange dots ( Fig. 29 View FIGURE 29 D). Spinnerets yellow. Palpal organ ( Figs 29 View FIGURE 29 G –J) yellow, with brown cymbium, tegulum relatively narrow, embolus short, embolus located anteriorly, translucent part of spermophore not meandering, tibia makes 69 % of cymbium length, retrolateral tibial apophysis hooked.

Dimensions. CL 2.20, CW 1.88, CH 1.16, AEW 1.64, PEW 1.88, EFL 1.16, AL 2.76, AW 1.40, L 1 7.92 (2.04 + 1.60 + 2.12 + 1.40 + 0.76).

Female unknown.

Remark. Referring to the original illustrations by Koch and Keyserling, it is likely that O. teniupes   and O. abnormis   represent single species. However, because of lacking the male type specimen of O. abnormis   , this has to be verified on new material.

chelicera); F: chelicera, ventral view; G –J: palpal organ, ventral and retrolateral views. Scale bars B –C: 1 mm; H, J: 0.25 mm.