Ariadna kiwirrkurra Baehr & Whyte

Baehr, Barbara C. & Whyte, Robert, 2016, The first described male Tube-web Spider for mainland Australia: Ariadna kiwirrkurra sp. nov. (Araneae: Segestriidae), Zootaxa 4189 (3), pp. 595-599 : 595-597

Ariadna kiwirrkurra Baehr & Whyte , sp. nov.

( FIGURE 1 A–C, 2, 3 A–I, 4 A–F)

Material examined. Holotype male (WAM-T138053) from Australia: Western Australia, Kiwirrkurra , SSS1, 22°51'56"S, 127°45'41"E, 449m, B. Baehr et.al., 8–18 Sep. 2015, vertebrate traps.

Paratypes: 3 males (WAM-T138054) same as previous; 2 males (WAM-T138052), Kiwirrkurra SSS2, 22°48'42"S, 127°49'52"E, 436m, B. Baehr, et al. 8–18 Sep. 2015, vertebrate traps; 1 male (QM-S96340) same as previous.

Etymology. The specific name is a noun in apposition taken from the type locality. Kiwirrkurra in the Gibson Desert is one of Australia's most recent Indigenous Protected Areas (IPA).

Diagnosis. Ariadna kiwirrkurra can be separated from A. decatetracantha Main, 1954 in having a fovea as an indented pit ( A. decatetracantha has no fovea); from A. thyrianthina Simon, 1908 by the oval opisthosoma (opisthosoma cylindrical in A. thyrianthina ); from Ariadna burchelli ( Hogg, 1900) by the absence of any opisthosomal pattern ( A. burchelli has an opisthosomal pattern); from A. octospinata ( Lamb, 1911) by PME in line of PLE (PME placed behind the line of PLE in A. octospinata ) and from A. dysderina L. Koch, 1873 by the round PME (PME oval in A. dysderina ). A. kiwirrkurra can be separated from the remaining non mainland Australian Ariadna species, in having the long paturon forward directed with lateral condyle; and a large globular palpal bulb at least twice the diameter of the tibia.

Description. Male (Holotype, WAM-T138053). Total length 7.18. Prosoma 3.72 long, 2.84 wide, pl/pw 1.31; sternum 2.55 long, 1.29 wide, sl/sw 1.97, nearly 2 x as long as wide; opisthosoma 3.46 long, 2.56 wide. Eyes, anterior eye row narrower than posterior eye row; lateral and median eyes contiguous; eyes arranged in 3 closely spaced diads; PME largest; ALE 0.18; PME 0.19; PLE 0.18; ALE-ALE 0.33; PME-PLE 0.13. Clypeus 0.14 high. Prosoma dark brown, oval, reticulated, posteriorly concave ( Fig. 3 A), sides rebordered and slightly undulated, fovea an indented pit.

Chelicerae dark brown, directed forward; paturon twice as long as wide with lateral condyles, promargin with 3 ( Fig. 4 B), retromargin with 1 tiny tooth, fangs short directed medially ( Fig. 4 A). Endites, labium, medium brown, tips of endites white ( Fig. 4 B); sternum pale sides darker ( Fig. 3 A); opisthosoma oval, dark brown without any pattern; venter medium brown, booklungs pale (Fig. 38). Endites: serrula a single row of teeth ( Fig. 3 D). Legs robust, yellow; leg I, II: distal part of femur, patella and tibia dark brown; metatarsus I with prolateral tubercle ( Fig. 3 F, 4C, D), superior tarsal claw I and II with about 13 teeth ( Fig. 4 E), claw III and IV with about 7 medially situated teeth ( Fig. 4 F), inferior claw tiny, without teeth ( Fig. 4 F). Tarsus IV ventrally swollen ( Fig. 4 F). Leg formula: II-I-IV-III. Leg measurements: I, femur 3.36, patella 1.15, tibia 2.90, metatarsus 2.60, tarsus 1.02, total 10.13; II, 3.07, 1.26, 2.75, 2.73, 0.93, 10.74; III, 2.54, 0.73, 1.72, 1.66, 0.85, 7.50; IV, 3.17, 1.08, 2.33, 1.98, 0.96, 9.16. Leg spination (only surfaces bearing spines are listed): I: femur d1-1-1, p3ap,dr1ap; patella p1ap; tibia p1-1-1-1-1, vp2-2-2-1, vr1-1-1-1, r1-1-1-1-1-1-1; metatarsus p1-0-0-1, r1-0-0-1; II: femur d1-1-1-1, dp2ap,dr2ap; tibia p1-1-1, vp1-1-1, vr1-1-1-1, r1-1-1-1-1-1-1; metatarsus p1-1-1, v1, r1-1- 1-1; III: femur d1-1-1-1, dp2ap,dr2ap; tibia p1-1-1, v1, r1-1-1-1; metatarsus p1-1-1, v1, vr1-1, r1-1; IV: femur d1-1-1-1- 1; metatarsus r1. Male palp ( Figs 3 G-I): cymbium short, dorsally indented about as long as wide, covered with black setae ( Fig. 3 H); large globular palpal bulb twice the diameter of the tibia ( Figs 3 G, I), embolus long and thin; tip s-shaped ( Figs 3 G, I).

Female. Unknown

Distribution. Known only from the Kiwirrkurra IPA in the Gibson Desert in Western Australia ( Fig. 1 A–C).

Figures

FIGURE 1 (A – C). A Habitat of A. kiwirrkurra at Kiwirrkurra IPA in the Gibson Desert; B standard site SS 1, C standard site SS 2

FIGURE 3 (A – I). Ariadna kiwirrkurra, Baehr & Whyte sp. nov., male (WAM-T 138053). A habitus, dorsal view; B habitus, lateral view; C habitus, ventral view; D prosoma, anterior view; E sternum; F right leg I, prolateral view; G male palp, prolateral view; H same, dorsal view; I same, retrolateral view. Scale bars 1 mm except D 0.1 mm.

FIGURE 4 (A – F). Ariadna kiwirrkurra, Baehr & Whyte sp. nov., male (T 138053). A chelicerae, dorsal view; B mouthparts, ventral view; C right leg I tarsus & metatarsus, dorsal view; D metatarsal tubercle on metatarsus I; E right tarsus I, prolateral view; F right tarsus IV, prolateral view. Scale bars: A, B, D: 0.1 mm, C, E, F: 1 mm