Opisthoncus grassator Keyserling, 1883

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 417-420

Opisthoncus grassator Keyserling, 1883

( Figs 11 , 12 )

Opisthoncus grassator: Keyserling 1883: 1457 ; Simon 1903: 826, 827, 828, 829; Rainbow 1911: 309; Żabka, 1991: 45.

Type material. 1M, 1F Syntypes, ZMH, Mus. Godeffroy 7728, Australia: Peak Downs.

Diagnosis. Female chelicerae with four-cuspidate fissident tooth ( Figs 11 G–H). In male retromargin with 3 teeth, located close to each other, promargin with distal tooth somewhat larger than the proximal one ( Fig. 12 G); fangs with internal outgrowths ( Fig. 12 C); frontal spurs well developed and cone-like, ventral ones teeth-like and moderately small ( Figs 12 C, F, G). Tegulum round and small, embolus elongate, arising at 3 o’clock. Copulatory openings relatively large, insemination ducts wide in initial parts, narrowing distally, coiled in two circles at membranous part, intermediate ducts curved and looped as in Fig. 11 J. Spermathecae relatively small, accessory glands elongate. Posterior notch round and moderately deep. Differs from similar O. alborufescens mainly by orientation of spermathecae and relatively longer accessory glands. In comparison with close O. magnidens armament of male chelicerae different, embolus somewhat shorter, spermathecae close to each other in anterior parts, accessory glands markedly longer.

Description. Female ( Fig. 11 ) about 7 mm long. Cephalothorax round, broadest below PLE and moderately low (CW = 85% of CL, CH = 46% of CL), pale brown, covered with short, recumbent pallid scales and scattered brown hairs, cephalic protruberance darker ( Figs 11 D–E). Surrounding of eyes brown, with orange scales. Clypeus moderately narrow, orange, covered with numerous pallid short scales and longer hairs ( Figs 11 B–C). Chelicerae, endites and labium pale brown, the latter with yellow anterior margins. Sternum relatively round, yellow, with scattered fine, brown hairs ( Fig. 11 F). Abdomen ovoid, yellow, with scattered brown hairs and pattern of longitudinal leaf-like pallid area, bordered in brown colour as in Fig. 11 E. Venter yellowish, with central elongate stripes of small brown spots. Spinnerets yellow. Legs orange, with first pair somewhat darker than others. Pedipalps yellow. Epigyne as in Figs 11 I–J

Dimensions. CL 2.60, CW 2.16, CH 1.20, AEW 1.68, PEW 1.80, EFL 0.92, AL 4.00, AW 2.16, L1 6.00 (1.60+1.40+1.40+1.00+0.60).

Male ( Fig. 12 ) about 8.5 mm long. Cephalothorax round, broadest below PLE (CW = 89% of CL, CH = 46% of CL), pale brown, darker in distal part and covered with numerous, easily rubbing off, recumbent pale scales and scattered brown hairs ( Figs 12 B, D). Surrounding of AME brown, other eyes surrounded in black. Clypeus very narrow, pale brown with brownish setae ( Fig. 12 C). Cheliceral armament as in diagnosis, retromarginal teeth seem to be separated. Chelicerae, endites and labium brown, anterior margins of endites and labium yellow. Sternum wide, yellow, clothed in fine, brown hairs ( Fig. 12 E). Abdomen elongate, yellow, with dorsal orange scutum, covered with scattered brown hairs, pattern of central pallid area similar to that observed in female, however hardly discoloured. Venter yellowish, with elongate stripes of small, brown spots. Spinnerets yellow. Legs orange-yellow. Pedipalps yellow. Structure of palpal organ ( Figs 12 H–K): embolus arising retrolaterally, translucent part of spermophore not meandering, tibia about 50% of cymbium length.

Dimensions. CL 3.50, CW 3.12, CH 1.60, AEW 2.00, PEW 2.08, EFL 1.18, AL 4.96, AW 2.32, L1 12.20 (3.04+2.64+3.28+2.04+1.20).

Opisthoncus keyserlingi Żabka, 1991 ( Fig. 13 )

Hasarius albiventris: Keyserling 1881: 1291 . Cytaea albiventris: Simon 1903: 815 .

Opisthoncus keyserlingi: Żabka, 1991: 45 .

Type material. 1F holotype, Hasarius albiventris , ZMH, Mus. Godeffroy 7669, Australia: Sydney [NSW].

Diagnosis. Retromarginal cheliceral tooth two-cuspidate ( Fig. 13 D). Differs from O. abnormis by details of epigyne: spermathecae close to each other in distal parts. Posterior notch round.

Description. Female ( Fig. 13 ) about 4.5 mm long. Cephalothorax almost rectangular and moderately high (CW = 80% of CL, CH = 50% of CL), brown with paler cephalic part, sparsely covered with short pallid scales ( Figs 13 A–B). Ocular area almost black. Clypeus moderately wide, pale brown, densely covered with whitish scales and setae ( Fig. 13 C). Chelicerae pale brown, endites and labium the same colour, with yellow anterior margins. Sternum relatively narrow, yellow ( Fig. 13 E). Abdomen with wide, longitudinal herring-bone pallid stripe, bordered by dark brown areas ( Figs 13 A–B). Venter whitish, with dark brown side stripes ( Fig. 13 F). Spinnerets yellow. Legs I and II orange, others yellow. Pedipalps yellow. Epigyne as in Fig. 13 G.

Dimensions. CL 2.00, CW 1.60, CH 1.00, AEW 1.48, PEW 1.48, EFL 0.88, AL 2.48, AW 1.48, L1 4.72 (1.60+1.00+1.00+0.72+0.40).

Male unknown.

Figures

FIGURE 11. Opisthoncus grassator L. Koch, 1883, female syntype. A: original drawings from Koch & Keyserling (1883); B – C: cephalothorax, fronto-lateral and fronto-dorsal views; D – F: general appearance (lateral, dorsal and ventral views); G – H: chelicera, ventral view; I – J: epigyne and its internal structures. Scale bars D – F: 1 mm; I – J: 0.1 mm.

FIGURE 12. Opisthoncus grassator L. Koch, 1883, male syntype. A: original drawings from Koch & Keyserling (1883); B: general appearance, dorsal view (with shape of cephalothorax); C – D: cephalothorax, frontal (with chelicera) and dorso-lateral views; E: sternum; F – G: chelicerae, frontal (frontal spur, see arrow) and ventral views; H – K: palpal organ, ventral and retrolateral views. Scale bars B, C: 1 mm; H, I, K: 0.25 mm.

FIGURE 13. Opisthoncus keyserlingi Żabka, 1991, female holotype. A – B: general appearance, dorsal and lateral views; C: cephalothorax, frontal view; D: chelicera, ventral view; E: sternum; F: abdomen, ventral view; G: internal structures of epigyne. Scale bars A, B: 1 mm; I – J: 0.1 mm.