Opisthoncus machaerodus Simon, 1909, Simon, 1909

Gardzińska, Joanna & Żabka, Marek, 2013, Redescription of the genus Opisthoncus L. Koch, 1880 (Araneae: Salticidae), Zootaxa 3717 (4), pp. 401-447: 423-427

publication ID

http://dx.doi.org/10.11646/zootaxa.3717.4.1

publication LSID

lsid:zoobank.org:pub:55248289-2E05-4F07-BFC7-99AFED7D4E93

persistent identifier

http://treatment.plazi.org/id/F45B8781-3314-FFB7-94D0-FF2EB7EEF9F4

treatment provided by

Plazi

scientific name

Opisthoncus machaerodus Simon, 1909
status

 

Opisthoncus machaerodus Simon, 1909  

( Figs 15 View FIGURE 15 )

Opisthoncus machaerodus: Simon 1909: 206   –207; Rainbow 1911: 309; Żabka 1991: 45–46.

Type material. 1 M Holotype, ZMH, Mus. Godeffroy 102, Dr. W. Michaelsen, ded. 1 X. 1909, Hambg. S.W. Austral. Exp. 1905, 27.VIII. 1905, Western Australia: Midland.

Comparative material. 2 M, MNHN 24312, Austral. occid (Michaelsen), Australia.

Diagnosis. Each male cheliceral retromargin with 2 fused teeth, of them the distal one strongly enlarged, promarginal teeth of similar size, small ( Fig. 15 View FIGURE 15 E). Both frontal and ventral spurs horn-like, enlarged and located nearby fangs ( Fig 15 View FIGURE 15 D, E, F). Fangs with small internal outgrowths. Differs from other species by features of palpal organ: tegulum heart-shaped, embolus wide in initial part, with margins bent inside, tibia of shape as in Figs 15 View FIGURE 15 G –J.

Description. Male ( Fig. 15 View FIGURE 15 ) about 5.5 mm long. Cephalothorax trapezoid, broadest at PLE level (CW = 90 % of CL) and moderately high ( CH = 52 % of CL), pale brown, eye surrounding brown ( Figs 15 View FIGURE 15 A, C). Clypeus moderately narrow, pale brown, with scattered pallid and brown hairs ( Figs 15 View FIGURE 15 D, F). Chelicerae pale brown, with scattered brownish hairs, maxillae and labium of the same colour, with yellow anterior margins. Sternum relatively narrow, yellow. Abdomen elongate ovoid, yellow-brown, with pattern as in Fig. 15 View FIGURE 15 A. Spinnerets orange. Venter yellowish, darker on sides, with elongate stripes of small brown spots ( Fig. 15 View FIGURE 15 B). Palpal organ ( Figs 15 View FIGURE 15 G –J): robust, cymbium truncated, tegulum relatively enlarged, embolus short, sliver-like, arising at 11 o’clock, translucent part of spermophore not meandering, retrolateral tibial apophysis slender.

Dimensions. CL 2.44, CW 2.20, CH 1.28, AEW 1.84, PEW 1.88, EFL 0.92, AL 2.96, AW 1.88, L 1 7.84 (2.04 + 1.92 +2.00+ 1.16 + 0.72).

Female unknown.

Remark. Due to differences in palpal structure, the generic status of the species has to be confirmed.

Opisthoncus magnidens L. Koch, 1880   ( Figs 16 View FIGURE 16 , 17 View FIGURE 17 )

Opisthoncus magnidens: Koch L. 1880: 1209   ; Hogg 1900: 77; Żabka 1991: 46.

Type material. 1 M, 1 F Syntypes, ZMH, Mus Godeffroy 7735, Australia: Rockhampton.

Remarks. Koch and Keyserling (1880) described both sexes. The type material comprises 1 female and 2 males, only one of the males belongs to O. magnidens   , the second one is O. grassator   .

Diagnosis. Female chelicerae with 4 fused teeth ( Fig. 16 View FIGURE 16 D) and male with 3 teeth situated close to each other ( Fig. 17 View FIGURE 17 D) on each retromargin. Male promarginal teeth differ in size: distal one distinctly bigger than the proximal. Frontal spurs well developed and finger-like ( Fig. 17 View FIGURE 17 E), ventral ones lobe-like, enlarged and located far away the retromarginal teeth ( Fig. 17 View FIGURE 17 D). Fangs with internal outgrowths ( Fig. 17 View FIGURE 17 E). Tegulum round and relatively small, embolus elongate, rising at 3.30 o’clock. Insemination ducts elongate, membranous part coiled in 2 circles, intermediate ducts curved and looped as in Fig. 16 View FIGURE 16 H. In comparison with related O. grassator   armament of male chelicerae different, embolus somewhat longer, spermathecae more distant from each other, accessory glands shorter.

Description. Female ( Fig. 16 View FIGURE 16 ) about 6.5 mm long. Cephalothorax round and moderately high (CW = 92 % of CL, CH = 50 % of CL), pale brown, darker on cephalic protruberance and posteriorly, covered with short, recumbent pallid scales and scattered brown hairs ( Figs 16 View FIGURE 16 B, F). Surrounding of AME brown, of other eyes black. Clypeus moderately narrow, pale brown, with numerous pallid scales and setae ( Fig. 16 View FIGURE 16 E). Chelicerae, endites and labium pale brown, the latter with yellow anterior margins. Sternum moderately wide, yellow, with darker margins ( Fig. 16 View FIGURE 16 C). Abdomen large, ovoid, yellow, with scattered brown hairs and rather indistinct (discoloured) pattern. Venter yellowish, with central elongate stripes of small brown spots. Spinnerets yellow. Legs orange, first pair darker than others. Pedipalps yellow. Epigyne ( Figs 16 View FIGURE 16 G –H): posterior notch shallow, copulatory openings wide, membranous part of insemination ducts coiled in two circles, intermediate sclerotized parts elongate and curved as in Fig. 16 View FIGURE 16 H, spermathecae relatively small, accessory glands round and relatively short.

Dimensions. CL 2.40, CW 2.20, CH 1.20, AEW 1.60, PEW 1.68, EFL 0.88, AL 4.08, AW 2.80, L 1 5.24 (1.48 + 1.20 + 1.20 + 0.80 + 0.56).

Male ( Fig. 17 View FIGURE 17 ) about 6.5 mm long. Cephalothorax round, moderately high (CW = 92 % of CL, CH = 58 % of CL), pale brown, covered with pale scales and scattered brown hairs ( Fig. 17 View FIGURE 17 B). Surrounding of AME brown, other eyes surrounded in black. Clypeus narrow, pale brown, with sparse pallid hairs ( Fig. 17 View FIGURE 17 F). Cheliceral armament as in diagnosis. Chelicerae, endites and labium pale brown, anterior margins of endites and labium yellow. Sternum relatively wide, yellow, with darker margins and sparsely clothed in fine, brown hairs. 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 ( Fig. 17 View FIGURE 17 B). Venter yellowish, with elongate stripes of small brown spots. Spinnerets orange. Legs orange-yellow. Pedipalps yellow. Palpal organ ( Figs 17 View FIGURE 17 G –J): embolus arising retrolaterally, translucent part of spermophore not meandering, tibia about 45 % of cymbium length.

Dimensions. CL 2.60, CW 2.40, CH 1.50, AEW 1.68, PEW 1.76, EFL 1.00, AL 3.80, AW 1.96, L 1 9.44 (2.40 +2.00+ 2.52 + 1.60 + 0.92).

Opisthoncus mandibularis L. Koch, 1880   ( Fig. 18 View FIGURE 18 )

Opisthoncus mandibularis: Koch L. 1880: 1202   ; Simon 1903: 827, 828; Rainbow 1911: 309; Żabka 1991: 46.

Type material. 1 M Holotype, ZMH, Mus. Godeffroy 7739, Australia: Sydney [NSW].

Diagnosis. Both male cheliceral promarginal teeth small, retromarginal teeth unidentate ( Fig. 18 View FIGURE 18 D). Frontal surface of each chelicera with strongly sclerotized frontal edge, terminating with vestigial spur ( Fig. 18 View FIGURE 18 E). Ventral spurs relatively large, flat and divided as in Fig. 18 View FIGURE 18 D. Fangs with internal and external outgrowths. Tegulum elliptic, narrow, embolus moderately long, arising at 6 o’clock. Differs from O. lineativentris   by the shape of cheliceral ventral spurs and spermophore, which is not meandering.

Description. Male ( Fig. 18 View FIGURE 18 ). Spider about 10 mm long. Cephalothorax trapezoid, moderately low (CW = 87 % of CL, CH = 45 % of CL), dark brown, covered with fine, pallid hairs ( Fig. 18 View FIGURE 18 C). Surrounding of PLE black. Clypeus moderately narrow, dark brown, densely covered with long, pallid setae ( Fig. 18 View FIGURE 18 B). Chelicerae pale brown, with scattered brown hairs and armament as in diagnosis. Endites and labium dark brown, with yellow anterior margins. Sternum narrow, orange ( Fig. 18 View FIGURE 18 F). Abdomen lacking. Legs brown, with lighter coxae and trochanters. Pedipalps brown. Palpal organ ( Figs 18 View FIGURE 18 G –J): tegulum elliptic, moderately narrow, embolus arising distally, translucent part of spermophore not meandering, tibia about 82 % of cymbium length, retrolateral tibial apophysis rather slender.

Dimensions. CL 4.12, CW 3.60, CH 1.85 AEW 2.60, PEW 2.92, EFL 1.60, AL 5.50, L 1 14.76 (3.80 + 3.32 + 3.84 + 2.40 + 1.40).

Remark. Due to lacking abdomen, we give original measurement of abdomen (above) by Koch and Keyserling (1880).

Female unknown.