Strotarchus minor Banks, 1909

Bonaldo, Alexandre B., Saturnino, Regiane, Ramírez, Martín J. & Brescovit, Antonio D., 2012, A revision of the American spider genus Strotarchus Simon, 1888 (Araneae: Dionycha, Systariinae), Zootaxa 3363, pp. 1-37 : 29

Strotarchus minor Banks, 1909

Figs. 103−105

Strotarchus minor Banks, 1909: 200 , pl. 5, fig. 18. Female holotype from Tristan, Turrialba [83º40.8'W, 9º54'N], Costa Rica, N. Banks coll., deposited in MCZ, examined.

Diagnosis. Males of Strotarchus minor differ from those of other species with a basal embolar fold traversing the apical portion of the tegulum by the long tegular apophysis, represented by a fold in the retrolateral margin of the tegulum; the small, unsclerotised, rectangular embolar process; and the embolar base visible ventrally in ventral view ( Figs. 103, 104 ). Females are readly recognised by the combined presence of an elliptical atrium, with sharply pointed lateral corners, and the divergent copulatory ducts ( Fig. 105 ).

Description. Male (Puntarenas, Costa Rica). Carapace red brown, with cephalic area yellow and thoracic groove brownish. Chelicerae red brown. Labium and endites reddish with white apex. Leg yellow, with brown basal area of the articles. Abdomen cream with transverse dorsal stripes. Total length 6.70. Carapace 3.40 long, 2.60 wide. Eye diameters: AME 0.26, ALE 0.20, PME 0.22, PLE 0.22. Chelicerae with 3 promarginal teeth, median largest, and 7 retromarginal denticles. Leg measurements: femur I 3.80/ II 3.20/ III 2.70/ IV 3.30. Leg spination: I—femur d1-1-1, p0-1-1, r0-1-0; tibia d0-1-0, p1-1-0, r1-1-0, v2-2 -0; metatarsus d0-1-0, p1-1-2, r1-1-2, v2-2 - 1m. II—femur d1-1-1, p0-1-1-1, r0; tibia d0-1-0, p1-1-0, r1-1-0, v2-2 -0; metatarsus d0-1-0, p1-1-2, r1-1-2, v2-2 - 1m. III—femur d1-1-1, p0-1-1-1, r0-0-1; tibia d0, p1-1-0, r1-1-0, v1 p-2-0; metatarsus d0-1m-0, p1-1-2, r1-1- 2, v2-2 - 1m. IV—femur d1-1-1, p0-1-1-1, r0-0-1; tibia d0, p1-1-0, r1-1-0, v2-2 -1r; metatarsus d0-1m-0, p1-1-2, r1- 1-2, v2-2 - 1m. Palpal tibiae long, approximately one third of the cymbium length; RTA rectangular, slightly serrated apically; ppRTA and laRTA absent. Tegulum large, sub-triangular, truncated apically; proximal fold of reservoir wide, placed ventrally; TA inserted in retrolateral margin of tegulum; BEF narrow, traversing apical portion of tegulum; EP small, squared, hyaline; EA arising prolaterally ( Figs. 103, 104 ).

Female (Holotype). Coloration as in male, except carapace light brown and abdomen yellow. Total length 7.10. Carapace 3.65 long, 2.90 wide. Eye diameters: AME 0.25, ALE 0.25, PME 0.22, PLE 0.22. Chelicerae with 4 promarginal teeth, the second largest, and 4 retromarginal teeth. Leg measurements: femur I 3.60/ II 3.15/ III 2.65/ IV 3.45. Leg spination: I—femur d1-1-0, p0-0-2, r0; tibia d0, p0-1-1, r0-1-0, v2-2 -0; metatarsus d0, p1-1-1, r1-1-1, v2-2 -2. II—femur d1-0-0, p0, r0; tibia d0, p0-1-1, r0-0-1, v2-2 -0; metatarsus d0, p1-2-2, r1-1-2, v2-2 -2. III—femur d1-1-0, p0, r0; tibia d0-1, p0-1-1, r0-1-1, v1-2 -0; metatarsus d0, p1-2-2, r1-1-2, v2-2 -1. IV—femur d1-1-0, p0, r0; tibia d0, p0-1-1, r0-1-1, v1-2 -2; metatarsus d0, p1-2-2, r1-1-2, v2-2 -1. Epigynum (not dissected): Copulatory ducts with several helicoid folds; spermathecae squared, with a median constriction visible by transparency in ventral view ( Fig. 105 ).

Distribution. Costa Rica.

Other material examined. COSTA RICA. Puntarenas Prov., between Quepos [84º9'W, 9º27'N] and Santa Maria de Dota, 1 male, W. Eberhard coll. ( MCZ).

Figures

FIGURES 103 – 105. Strotarchus minor Banks, 1909, male: 103) palp, ventral; 104) palp, retrolateral; female: 105) epigynum, ventral. Scale bar = 0.5 mm.