Xiruana tribarrense, Oliveira, Luiz Fernando M. & Brescovit, Antonio D., 2015

Oliveira, Luiz Fernando M. & Brescovit, Antonio D., 2015, A taxonomic revision of the Neotropical spider genus Xiruana Brescovit 1997 (Araneae: Anyphaenidae, Anyphaeninae), Zootaxa 3980 (2), pp. 201-229 : 225

Xiruana tribarrense new species

Figs 14 A–B; 16B

Type material. Female holotype from Foz do Córrego Três Barras, Rio Guarani, Três Barras do Paraná (25°25’08”S; 53°10’51”W), Paraná, Brazil, 20–26.II.1993, A. B. Bonaldo leg., deposited in MCN 22942.

Etymology. The specific name, from Brazilian Portuguese, is a gentilic adjective designating those born in the municipality of Três Barras do Paraná.

Diagnosis. Females of Xiruana tribarrense n. sp. differ from those of all other species in the genus by the epigynal plate with the posterior border narrowed and extremely broad ( Fig. 14 A).

Description. Female (MCN 22942). Coloration as in X. hirsuta . Total length 5.59, carapace length 2.5, width 2.0. Clypeus height 0.06. Eye diameters and interdistances: AME 0.1, ALE 0.10, PME 0.12, PLE 0.12; AME– AME 0.06, AME–ALE 0.02, PME–PME 0.14, PME–PLE 0.08, ALE–PLE 0.04. Chelicerae 1.2 long, with four promarginal teeth and five retromarginal denticles. Leg measurements: Leg I—femur 2.1/ patella 1.0/ tibia 2.1/ metatarsus 1.8/ tarsus 0.9/ total 7.9; II—2.0/ 0.9/ 1.9/ 1.5/ 0.8/ 7.1; III—1.7/ 0.7/ 1.2/ 1.5/ 0.5/ 5.6; IV—2.5/ 0.8/ 1.9/ 2.6/ 0.6/ 8.4. Leg spination: I—tibia v2-2 -0, p0, r0, metatarsus v2 -0-0, p0, r0; II—tibia v1-2 -0, p0-1-0, r0, metatarsus v2 -0-0, p0, r0; III—tibia v1-2 -2, p0-1-1, r0-1-1; IV—tibia v1-2 -2, p1-1-1, r1-1-1. Abdomen: length 3.1, epigastric furrow 1.0 from tracheal spiracle, spiracle 1.5 from base of spinnerets. Epigynum: copulatory ducts long and curved anteriorly; seminal receptacles clearly separated from the globose spermathecae; fertilization ducts longer than spermathecae width ( Figs 14 A, B).

Male. Unknown.

Other material examined. Only the holotype.

Distribution. Known only from the type locality ( Fig. 16 B).

Figures

FIGURE 14. Xiruana tribarrense n. sp.: A female epigynum, ventral view; B same, dorsal view. Xiruana cocha n. sp.: C female epigynum, ventral view; D same, dorsal view. Scale bars: B, D 0.25 mm.

FIGURE 16. Known distribution of Xiruana species.