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

publication ID

http://doi.org/ 10.3853/j.2201-4349.71.2019.1698

publication LSID

lsid:zoobank.org:pub:7EDBAB7F-0E3B-47D7-AA29-0906728ADA05

persistent identifier

http://treatment.plazi.org/id/26714D71-FFBB-FFFD-07BC-FA47FD12FFDF

treatment provided by

Felipe

scientific name

Stephanopis angulata Rainbow, 1899
status

 

Stephanopis angulata Rainbow, 1899  

Figs 4–5 View Figure 4 View Figure 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 View Materials , 1♂, Wau, PNG, 7°20'13.69"S 146°42'57.37"E, H. Levi, Y. Lubin & M. Robinson, 7 March 1979. GoogleMaps  

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

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 View Figure 4 ). 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 View Figure 4 ); lobed anterior chambers, and glandular-heads oriented medially rather than laterally ( Fig. 4D View Figure 4 ). 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 View Figure 5 ); the RTAvrb is also wide and points towards the RTA, forming a “crab claw” like structure with the latter ( Fig. 5D View Figure 5 ).

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

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 View Figure 5 ). Prosoma reddish-brown, legs lightbrown; prolateral surface of femora, patellae and tibiae I suffused by whitish setae ( Fig. 5B View Figure 5 ). 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 View Figure 13 ).

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

QM

Queensland Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Thomisidae

Genus

Stephanopis

Loc

Stephanopis angulata Rainbow, 1899

Machado, Miguel, Teixeira, Renato Augusto & Milledge, Graham A. 2019
2019
Loc

Stephanopis angulata

Rainbow, W. J. 1899: 144
1899