Xiruana minacu, 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 : 223-224

Xiruana minacu new species

Figs 13 A–B; 16B

Type material. Female holotype from Usina Hidrelétrica Serra da Mesa (13°31’58”S; 48°13’12”W), Minaçu , Goiás, Brazil, 18–30.XI.1996, A. B. Bonaldo, L. Moura leg., deposited in MCN 27961.

Etymology. The specific name is a noun in apposition taken from the type locality.

Diagnosis. The females of Xiruana minacu n. sp. differ from all other females in the genus by the sub-square anterior border of the epigynal plate and by the thicker anterior portion of the copulatory ducts ( Figs 13 A, B).

Description. Female (MCN 27961). Coloration as in X. hirsuta . Total length 8.1, carapace length 3.2, width 2.6. Clypeus height 0.1. Eye diameters and interdistances: AME 0.12, ALE 0.12, PME 0.12, PLE 0.12; AME– AME 0.06, AME–ALE 0.06, PME–PME 0.18, PME–PLE 0.16, ALE–PLE 0.04. Chelicerae 1.7 long, with four promarginal teeth and four retromarginal denticles. Leg measurements: Leg I—femur 2.9/ patella 1.1/ tibia 3.0/ metatarsus 2.0/ tarsus 1.1/ total 10.1; II—2.4/ 1.0/ 2.0/ 2.0/ 1.0/ 8.4; III—2.1/ 1.0/ 1.5/ 2.0/ 0.8/ 7.4; IV—2.3/ 1.1/ 2.5/ 3.5/ 1.0/ 10.4. 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 p1-0-1, r1-0-1; IV—tibia p1-1-1, r1-1-1. Abdomen: length 5.1, epigastric furrow 0.7 from tracheal spiracle, spiracle 3.0 from base of spinnerets. Epigynum: copulatory ducts curved at middle; spermathecae globose, fertilization ducts longer than spermathecae width; seminal receptacles with inconspicuous ducts, inserted on the posterior third of copulatory ducts ( Figs 13 A, B).

Male. Unknown.

Other material examined. Only the holotype.

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

Figures

FIGURE 13. Xiruana minacu n. sp.: A female epigynum, ventral view; B same, dorsal view. Xiruana fiebrigi 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.