Nasoona sabah, Tanasevitch, 2018

Tanasevitch, Andrei V., 2018, A survey of the genus Nasoona Locket, 1982 with the description of six new species (Araneae, Linyphiidae), Revue suisse de Zoologie 125 (1), pp. 87-100 : 93-96

Nasoona sabah sp. nov.

Figs 10-13 , 20-21 , 56-63

Holotype: Male ; EAST MALAYSIA, Borneo, Sabah, Kinabalu N.P., Mt Kinabalu, 1550 -1650 m a.s.l., Silau-Silau Trail, Lithocarpus-Castanopsis forest, sifting decomposing wood and dead leaves in humid ravine; 24.IV.1987; leg. D. Burckhardt & I. Löbl [#2a].

Paratypes: 2 males, 5 females; collected together with the holotype. – 1 male, 2 female; Mt Kinabalu, 1540 m a.s.l., Liwagu Trail, sifting leaf litter in small ravine and at base of old trees; 29.IV.1987; leg. D. Burckhardt & I. Löbl [#8a]. – 1 female; Mt Kinabalu, 1750 m a.s.l., Liwagu Trail, sifting bark, decomposing wood and leaf litter next to a log and at base of tree stumps; 27.IV.1987; leg. D. Burckhardt & I. Löbl [#5a]. – 6 females; Mt Kinabalu, 1500 m a.s.l., Liwagu Trail, section 2, Lithocarpus & Podocarpus forest, Silau-Silau Trail, Lithocarpus-Podocarpus forest, sifting moss and dead leaves along Silau-Silau Trail; 21. V.1987; leg. D. Burckhardt & I. Löbl [#34b].

Other material examined: Male holotype of Pronasoona sylvatica Millidge, 1995 ; Kinabalu N.P., Poring Hot Springs.

Diagnosis: The new species is characterized by the shape of the postocular elevation on the male carapace which looks like a transverse ridge similar to that in Pronasoona sylvatica , but P. sylvatica , has only one row of spines on the elevation, N. sabah sp. nov. has two rows of bent, stout spines. According to the male palp structure the new species appears most similar to N. kinabalu sp. nov. (see above). The epigyne of N. sabah sp. nov. resembles that of N. chrysanthusi , but differs by the shape of the translucent seminal ducts.

Etymology: The specific epithet is a name in apposition referring to the “terra typica”, the Sabah State of East Malaysia on Borneo Island.

Description:

Male (paratype from Silau-Silau Trail): Total length 2.02. Carapace 0.93 long, 0.70 wide, pale brown, with grey radial stripes and a narrow margin. A transverse postocular ridge slightly bent forward and bearing two rows of curved, stout spines. Spines of anterior row directed forward, those of posterior row directed backwards, as shown in Figs 10-13 ; eyes normal. Chelicerae 0.35 long, unmodified. Legs pale brown. Leg I 3.26 long (0.88+0.20+0.85+0.80+0.53), IV 3.23 long (0.90+0.22+0.83+0.80+0.48). Chaetotaxy: 2.2.1.1, length of spines about 1.5-2.5 diameters of leg segment. Each metatarsus with a trichobothrium. TmI 0.60. Palp ( Figs 56-61 ): Retrolateral branch of palpal tibia relatively long and wide, with several very short spinules terminally and with a black rounded tubercle on its inner side. Prolateral branch strongly sclerotized, dagger-shaped. Paracymbium L-shaped, ending with a hook. Distal suprategular apophysis short, flat, narrow, with a black, sharp tooth in middle. Embolus long and thin, forming a loop, radix reduced. Main body of convector curved, its distal apophysis dark, narrow, serrate. Paraconvector large, complicated, with a long, claw-shaped distal process. Abdomen 1.28 long, 0.70 wide, dorsal pattern as shown in Fig. 10 .

Female (paratype from Silau-Silau Trail): Total length 2.15. Carapace 0.95 long, 0.70 wide, unmodified. Chelicerae 0.43 long, unmodified. Legs pale brown. Leg I 3.41 long (0.95+0.25+0.88+0.83+0.50), IV 3.46 long (1.00+0.25+0.90+0.83+0.48). Chaetotaxy: 2.2.1.1, length of spines about 1.5-3 diameters of leg segment. Each metatarsus with a trichobothrium. TmI 0.60. Abdomen 1.38 long, 0.85 wide, dorsally white and with indistinct grey pattern. Epigyne ( Figs 20-21 , 62-63 ): anterior wall forming an angle slightly overhanging wide, shallow epigynal cavity. Seminal ducts very wide, receptacles subspherical.

Distribution: Only known from Mt Kinabalu on Borneo, East Malaysia.

Figures

Figs 1-16. Photographs of Nasoona indianа sp. nov., male holotype (1-3); N. orissa sp. nov., male paratype (4); N. intuberosa sp. nov., male paratypes (5-7) and female paratype (8); N. kinabalu sp. nov., male holotype (9); N. sabah sp. nov., male paratype from Liwagu Trail (10-12) and male paratype from Silau-Silau Trail (13); N. sulawesi sp. nov., male holotype (14-16).

Figs 17-27. Photographs ofNasoona intuberosa sp.nov., female paratype (17); N. kinabalu sp. nov., female paratype from Mt Kinabalu, 3150-3200 m (18) and female paratype from Mt Kinabalu, 2590 m (19); N. sabah sp. nov., female paratype from Silau- Silau Trail (20) and female paratype from Liwagu Trail (21); N. comata (Tanasevitch, 1998), specimens from Hellok, Nepal (22-27). (17-21, 24) Female abdomen, ventral view. (22) Male body, dorsal view. (23) Male prosoma, lateral view. (25-26) Female abdomen, dorsal view. (27) Epigyne, ventral view. Not to scale.

Figs 56-63.Nasoona sabah sp. nov., male and female paratypes from Mt Kinabalu, 1540 m. (56-57) Right palp, retrolateral and prolateral view, respectively. (58) Palpal tibia, dorsal view. (59) Palpal tibia and paracymbium, retrodorsal and slightly proximal view. (60) Distal suprategular apophysis. (61) Paraconvector and convector. (62) Epigyne, ventral view. (63) Cleared epigyne, dorsal view.