Opisthoncus nigrofemoratus (L. Koch, 1867)

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447 : 430-433

Opisthoncus nigrofemoratus (L. Koch, 1867)

( Fig. 21 )

Attus nigrofemoratus: Koch L. 1867: 222 .

Opisthoncus nigrofemoratus: Żabka, 1991: 46 .

Type material. 1M Holotype, ZMH, Mus. Godeffroy 2257, Koch det. et publ., Australia: Brisbane.

Diagnosis. Promargins of male chelicerae with blunt protuberances rather than typical teeth, retromarginal teeth unidentate ( Fig. 21 C–D). Frontal spurs distinct, conical ( Fig. 21 C). Each ventral spur flat and relatively small ( Fig. 21 D). Fangs with internal outgrowths. Tegulum elliptic, narrow, embolus moderately long, arising at about 6.30. From similar O. kochi differs by lobe-shaped ventral spurs and relatively longer palpal tibia.

Description. Male ( Fig. 21 ) about 6.5 mm long. Cephalothorax round, moderately high (CW = 91% of CL, CH = 60% of CL), light brown, covered with fine, pallid scales ( Figs 21 A–B). Surrounding of eyes black, except AME which are brown. Clypeus narrow, light brown, densely covered with pallid scales and setae ( Fig.21 C). Chelicerae, endites and labium pale brown, the latter with yellow anterior margins. Sternum relatively wide, yellow, with scattered pallid hairs. Abdomen ovoid, yellow, mottled light brown, with pallid longitudinal and serrated streak, dorsal scutum not large, but distinct. Venter yellow, with elongate stripes of small grey dots. Spinnerets orange. Legs orange, with pale brown femora, first pair darker than others. Palpal organ ( Figs 21 E–H) tegulum elliptic, moderately narrow, embolus set distally, translucent part of spermophore not meandering, tibia about 56% of cymbium length, retrolateral tibial apophysis rather slender.

Dimensions. CL 2.68, CW 2.44, CH 1.60, AEW 1.72, PEW 1.80, EFL 0.92, AL 3.92, AW 2.52, L1 7.64 (2.04+1.68+1.92+1.20+0.80).

Female unknown.

Opisthoncus parcedentatus L. Koch, 1880 ( Figs 22 , 23 )

Opisthoncus parcedentatus: Koch L. 1880: 1205 ; Davies & Żabka 1989: 214, 218; Żabka 1991: 46–47.

Type material. 1M, 1F Syntypes, ZMH, Mus. Godeffroy 7730, Australia: Bowen [Queensland].

Diagnosis. Female cheliceral retromargin with two-cuspidate fissident tooth ( Fig. 22 E). Male retromargins unidentate, promargins with 2 teeth of different sizes: distal one larger than the proximal one; each f rontal spur thin and sharp, ventral one enlarged and lobe-like, fangs with prolateral and external outgrowths ( Fig. 23 D–F). From related O. albiventris differs by longer insemination ducts and truncate posterior notch. In comparison with similar O. devexus cheliceral armament different, palpal tibia relatively longer and cephalothorax narrower.

Description. Female ( Fig. 22 ) about 6–6.5 mm long. Cephalothorax round (CW = 83% of CL) and moderately high ( CH = 51% of CL), pale brown, covered with short and recumbent scales, cephalic part lighter, thoracic one with white translucent guanine deposits ( Figs 22 A, B, D). Surrounding of eyes black. Clypeus moderately wide, pale brown, covered with numerous pallid short scales and longer hairs, longer and denser in the centre ( Fig. 22 C). Chelicerae, endites and labium pale brown, the latter with yellow anterior margins. Sternum moderately wide, orange, with scattered fine, pallid hairs. Abdomen ovoid, yellow, with colour pattern of longitudinal serrated whitish streak, bordered by lateral brown patches as in Fig. 22 A. Venter pallid, darker on sides ( Fig. 22 F). Spinnerets yellow-brown. Legs I orange, with yellow coxae and trochanters. Others yellow. Pedipalps yellow with orange tarsi. Epigyne ( Figs 22 G–H): copulatory openings relatively small, oriented mid-anteriorly, insemination ducts moderately narrow, coiled distally in one membranous circle, subsequently looped as in Fig. 22 H, spermathecae relatively large.

Dimensions. CL 2.16, CW 1.80, CH 1.10, AEW 1.60, PEW 1.60, EFL 0.88, AL 4.08, AW 2.64, L1 4.80 (1.40+1.08+1.08+0.80+0.44).

Male ( Fig. 23 ) 5–5.5 mm long. Cephalothorax round and moderately high (CW = 84% of CL, CH = 51% of CL), pale brown, covered with recumbent, pallid scales ( Figs 23 A, C). Surrounding of AME brown, others black. Clypeus moderately wide, pale brown, with dense fringe of pallid scales and setae ( Fig. 23 D). Chelicerae brown, with armament as in diagnosis. Endites and labium of the similar colour, with yellow anterior margins. Sternum relatively wide, orange, darker on sides. Abdomen elongate, yellow, with rather indistinct dorsal scutum and colour pattern as in Fig. 23 G. Spinnerets orange. Venter whitish, light brown sides on sides and with central elongate stripes of small orange dots. Legs brownish-orange. Palpal organ ( Figs 23 H–K) tegulum moderately narrow, elliptic, embolus prolaterally set at 7 o’clock, spermophore not meandering. Tibia about 60% of cymbium length.

Dimensions. CL 2.24, CW 1.88, CH 1.16, AEW 1.64, PEW 1.64, EFL 0.88, AL 3.00, AW 1.52, L1 6.44 (1.88+1.64+1.92+1.20+0.80).

Figures

FIGURE 21. Opisthoncus nigrofemoratus (L. Koch, 1867), male holotype. A – B: general appearance, dorsal and dorso-lateral views; C: cephalothorax, dorso-frontal view (with chelicera); D: chelicerae, ventral view; E – H: palpal organ, ventral and retrolateral views. Scale bars A – C: 1 mm; F, H: 0.15 mm.

FIGURE 22. Opisthoncus parcedentatus L. Koch, 1880, female syntype. A – B: general appearance, dorsal (with shape of cephalothorax) and lateral views; C – D: cephalothorax, frontal and lateral views; E: chelicera, ventral view; F: abdomen, ventral view; G – H: epigyne and its internal structures. Scale bars A, B, F: 1 mm; G – H: 0.15 mm.

FIGURE 23. Opisthoncus parcedentatus L. Koch, 1880, male syntype. A – C: general appearance, dorsal (with shape of cephalothorax), ventral and dorso-lateral views; D: cephalothorax, frontal view (with chelicera); E – F: chelicerae, lateral (with frontal spur, see arrow) and ventral view; G: abdomen, dorsal view; H – K: palpal organ, ventral and retrolateral views. Scale bars A – C, G: 1 mm; I, K: 0.2 mm.