Orchestina menglun Tong & Li, 2024

Song, Chenxue, Tong, Yanfeng, Bian, Dongju & Li, Shuqiang, 2024, A survey of the genus Orchestina Simon, 1882 (Araneae, Oonopidae) from Xishuangbanna, China, with descriptions of five new species, Zoosystematics and Evolution 100 (1), pp. 255-277 : 255

Orchestina menglun Tong & Li sp. nov.

Figs 6 , 7A-D

Type material.

Holotype: ♂ (SYNU-775), China, Yunnan, Mengla Co., Menglun Town, XTBG, fogging, Lvshilin, limestone monsoon rainforest (21°54.617'N, 101°16.843'E), elev. 738 m, 8 August 2011, Zheng, Zhao & Gao leg. Paratypes: 7♂ (SYNU-900-906), XTBG, fogging, secondary tropical seasonal moist forest (21°54.607'N, 101°17.005'E), elev. 633 m, 28 July 2007, Zheng leg.

Etymology.

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

Diagnosis.

The new species is similar to O. clavulata in having the pear-shaped bulb and the net-shaped pattern on carapace, but can be distinguished by the palpal tibia distinctly narrower than bulb (Fig. 7A, B ) vs. as wide as bulb in O. clavulata (Fig. 1A ) and endites not strongly sclerotized, with smoothly curved outer margin (Figs 6G , 7D ) vs. strongly sclerotized, with straight outer margin in O. clavulata (Fig. 1E ).

Description.

Male (holotype). Total length 1.18, carapace length 0.61, carapace width 0.42, abdomen length 0.56. Habitus as in Fig. 6A-C . Color in alcohol: pale yellow. Carapace oval, with sepia net-shaped pattern, pars cephalica strongly elevated in lateral view, with rounded posterolateral corners. Clypeus (Fig. 6F ) margin unmodified, curved downwards in front view, sloping forward in lateral view. Sternum (Fig. 6G ) longer than wide, with marginal band and median area of radiating lines, surface smooth. Mouthparts: chelicerae straight, anterior face unmodified; labium rounded, not fused to sternum, anterior margin not indented at middle; endites (Fig. 7D ) not strongly sclerotized, outer margin smoothly curved, with serrula. Abdomen ovoid, with gray ^-shaped pattern. Genitalia (Fig. 7A-C ): tibia of palp enlarged, length/width ratio = 1.72, cymbium small; bulb pear-shaped in lateral view, with ventral side strongly protruding proximally, about 1.52 times as wide as tibia; the sperm duct strongly curved with three loops; embolus short.

Female. Unknown.

Distribution.

China (Yunnan: Xishuangbanna Tropical Botanical Garden).

Figures

Figure 1. Orchestina clavulata Tong & Li, 2011, male (SYNU- 777). A, C, D. Left palp, prolateral, retrolateral and dorsal views; B. Left bulb, prolateral view; E. Endites and labium, ventral view. Abbreviation: Se = serrula. Scale bars: 0.1 mm.

Figure 6. Orchestina menglun sp. nov., holotype male. A-C. Habitus, dorsal, ventral and lateral views; D-G. Prosoma, dorsal, lateral, anterior and ventral views. Scale bars: 0.4 mm (A-C); 0.2 mm (D-G).

Figure 7. Orchestina menglun sp. nov., A-D, holotype male; Orchestina colubrina Liu, Henrard & Xu, 2019, E, F, male (SYNU- 841). A, E. Left palp, prolateral view; B, F. Left palp, retrolateral view; C. Left palp, dorsal view; D. Endites and labium, ventral view. Abbreviation: Se = serrula. Scale bars: 0.1 mm.