Stephanopis angulata Rainbow, 1899

Machado, Miguel, Teixeira, Renato Augusto & Milledge, Graham A., 2019, On the Australian Bark Crab Spider Genus Stephanopis: Taxonomic Review and Description of Seven New Species (Araneae: Thomisidae: Stephanopinae), Records of the Australian Museum 71 (6), pp. 217-276 : 227-228

Stephanopis angulata Rainbow, 1899

Figs 4–5

Stephanopis angulata Rainbow, 1899: 144 , fig. 3.

Type material examined. Holotype ♀, AMS KS.6680, Fly River , Papua New Guinea, 08°00'S 142°30'E; MCZ 133894 , 1♂, Wau, PNG, 7°20'13.69"S 146°42'57.37"E, H. Levi, Y. Lubin & M. Robinson, 7 March 1979.

Other material examined. QM S104672 , 1♀, Wau , PNG, 7°20'13.69"S 146°42'57.37"E, N.C. Coleman, 7 September 1971 ; MCZ 134025 , 1♂, Gazelle Peninsula , East New Britain, 4°38'23.00"S 151°59'5.00"E, S. Smith, 2 May 1979 ; MCZ 133892 , 1♂, 1♀, same data except 2 May 1980 .

Diagnosis. Females and males of S. angulata resemble those of S. fissifrons by their trapezoid opisthosoma, prosoma with lateral dark marks and projections on the dorsal surface of their patellae and tibiae I including a proximal setiferous tubercle on the latter ( Fig. 4A ). However, females of S. angulata can be distinguished by their narrower cephalic area, longer than wide prosoma, straight anterior border of the opisthosoma, epigynal plate with caliciform and wider than long atrium ( Fig. 4C ); lobed anterior chambers, and glandular-heads oriented medially rather than laterally ( Fig. 4D ). Males can be recognized by their longer than wide prosoma, distal edge of tegulum sinuous, well-developed PrsP, vestigial Pcym and short and wide RTA ( Fig. 5C and D ); the RTAvrb is also wide and points towards the RTA, forming a “crab claw” like structure with the latter ( Fig. 5D ).

Description. Female (QM S104672): Anterior eye row strongly recurved and posterior row straight ( Fig. 4A and B ); prosoma and legs I and II light-brown, legs III and IV predominantly dark-yellow ( Fig. 4A ). Cephalic prominence absent and ocular projections above the ALE reduced ( Fig. 4B ). Femur I with seven stout setiferous tubercles on ventral and prolateral surfaces; anterior tibiae (I and II) with four ventral pairs of macrosetae ( Fig. 4A ). Chelicerae light-brown proximally, lightening to yellow, distally. Opisthosoma whitish-yellow, squared-ended, almost trapezoid, with a pair of rounded posterior projections ( Fig. 4A ). Spermathecae irregularly globular and preceded by well-developed glandular-heads and wide, lobular chambers ( Fig. 4D ).

Measurements: eye diameters and interdistances: AME 0.10, ALE 0.21, PME 0.14, PLE 0.14, AME–AME 0.15, AME–ALE 0.17, PME–PME 0.26, PME–PLE 0.16, MOQ length 0.46, width 0.29; leg formula: 1-2-4-3: leg I—femur 3.67/ patella 1.88/ tibia 2.76/ metatarsus 1.85/ tarsus 0.96/ total 11.12; II—3.50/ 1.71/ 2.48/ 1.66/0.96/ 10.31; III—2.27/ 1.11/ 1.79/ 1.18/ 0.54/ 6.89; IV—2.63/ 1.03/ 1.85/ 1.31/ 0.72/ 7.54. Total body length 7.56; prosoma length 3.92, width 3.54; opisthosoma length 3.64; clypeus height 0.24; sternum length 1.77, width 1.39; gnathocoxae length 0.97, width 0.45; labium length 0.57, width 0.66.

Male (MCZ 133894): Eye arrangement as in female but the ocular projections above the ALE are a little more conspicuous ( Fig. 5A ). Prosoma reddish-brown, legs lightbrown; prolateral surface of femora, patellae and tibiae I suffused by whitish setae ( Fig. 5B ). Opisthosoma light-brown and trapezoid; other somatic features as in female.

Measurements: eye diameters and interdistances: AME 0.09, ALE 0.14, PME 0.12, PLE 0.12, AME–AME 0.09, AME–ALE 0.07, PME–PME 0.17, PME–PLE 0.09, MOQ length 0.35, width 0.31; leg formula: 1-2-4-3: leg I—femur 2.30/ patella 1.15/ tibia 1.68/ metatarsus 1.15/ tarsus 0.68/ total 6.96; II—2.04/ 1.06/ 1.49/ 0.99/0.62/ 6.20; III—1.19/ 0.63/ 0.87/ 0.56/ 0.49/ 3.74; IV—1.40/ 0.59/ 0.90/ 0.67/ 0.44/ 4.00. Total body length 4.55; prosoma length 2.21, width 2.06; opisthosoma length 2.34; clypeus height 0.20; sternum length 0.90, width 0.86; gnathocoxae length 0.47, width 0.26; labium length 0.24, width 0.38.

Distribution. Morobe and East New Britain, Papua New Guinea ( Fig. 13 ).

228 Records of the Australian Museum (2019) Vol. 71

Figures

Figure 4. Stephanopis angulata Rainbow, 1899, female (QM S104672). (A) dorsal habitus; (B) front; (C) epigynal plate, ventral view; (D) epigynal plate/spermathecae.

Figure 5. Stephanopis angulata Rainbow, 1899, male (MCZ 133894). (A) dorsal habitus; (B) front; (C) ventral view of the left palp; (D) left palp, retro lateral view.

Figure 13. Distribution records of Stephanopis altifrons, S. angulata, S. arenata sp. nov., S. armata and S. barbipes.