Nasoona intuberosa, 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 : 90-91

Nasoona intuberosa sp. nov.

Figs 5-8 , 17 , 42-48

Holotype: Male; EAST MALAYSIA, Borneo, Sabah, Tambunan Distr., Crocker Range, 1550 -1650 m a.s.l., near pass (road from Kota Kinabalu to Tambunan), Lithocarpus - Castananopsis, sifting decomposing wood, dead leaves and moss; 16.V.1987; leg. D. Burckhardt & I. Löbl [#27a].

Paratypes: 2 males, 3 females; collected together with the holotype.

Diagnosis: The new species is characterized by the unmodified carapace of males, which is untypical for the genus and previously known only from N. asocialis and N. chrysanthusi , as well as by the presence of two elongated pockets in the epigyne, similar to that of the Nepalense N. comata . Judging from the male palpal conformation, N. intuberosa sp. nov. is similar to two other new species described in here from the Mt Kinabalu, i.e., N. kinabalu sp. nov. and N. sabah sp. nov. From these two species N. intuberosa sp. nov. differs by the absence of a hump on the male carapace, by the shape of the palpal tibia, by details of the embolic division, as well as by the presence of two pockets divided by a relatively wide septum in the epigyne.

Etymology: The specific epithet is a Latin adjective referring to the absence of a hump on the male carapace, which is a characteristic feature for the genus Nasoona .

Description:

Male (paratype): Total length 1.65. Carapace 0.75 long, 0.65 wide, unmodified, pale brown, with grey radial stripes as shown in Figs 5-7 ; eyes normal. Chelicerae 0.35 long, unmodified. Legs yellow, pale brown. Leg I 3.21 long (0.83+0.23+0.82+0.78+0.55), IV 3.18 long (0.87+0.23+0.75+0.80+0.53). Chaetotaxy: spines mostly lost, but probably 2.2.1.1. Each metatarsus with a trichobothrium. TmI 0.61. Palp ( Figs 42-46 ): Tibia relatively short, its retrolateral branch wide, with several very short spinules terminally, and with a black, pointed tubercle on its inner side. Prolateral branch wellsclerotized, stylet-shaped. Proximal part of paracymbium narrow, L-shaped; distal part wide, ending in a hook. Distal suprategular apophysis very short, flat, with a black, sharp tooth in middle, and with a transparent, narrow process terminally. Embolus long and thin, forming a loop, radix reduced. Main body of convector curved, its distal apophysis dark, narrow, serrate. Paraconvector large, with a long, claw-shaped distal process. Abdomen 0.95 long, 0.63 wide, dorsal pattern as shown in Figs 5-6 . Female (paratype): Total length 1.80. Carapace 0.80 long, 0.68 wide, unmodified, pale brown, with grey, radial stripes, as shown in Fig. 8 . Chelicerae 0.35 long, unmodified. Legs pale brown. Leg I 3.21 long (0.88+0.25+0.78+0.75+0.55), IV 3.16 long (0.88+0.25+0.78+0.80+0.45). Legs yellow, pale brown. Chaetotaxy: 2.2.1.1, length of spines about 1.5-2.5 diameters of leg segment. Each metatarsus with a trichobothrium. TmI 0.62. Abdomen 1.03 long, 0.65 wide, as shown in Fig. 8 . Epigyne ( Figs 17 , 47-48 ) with two shallow elongated pockets; seminal ducts wide, S-shaped; receptacles subspherical.

Distribution: Only known from the type locality in the Crocker Range 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 42-48. Nasoona intuberosa sp. nov., male and female paratypes. (42-43) Right palp, retrolateral and prolateral view, respectively. (44) Palpal tibia, dorsal view. (45) Palpal tibia and paracymbium, retrodorsal and very slightly proximal view. (46) Distal suprategular apophysis. (47) Epigyne, ventral view. (48) Cleared epigyne, dorsal view.