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).