Orchestina concava 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 concava Tong & Li sp. nov.

Figs 4 , 5

Type material.

Holotype: ♂ (SYNU-771), China, Yunnan, Jinghong City, Menghai Co., Meng’a Town, Wengnan Vill., sifting leaf litter, secondary forest (22°05.020'N, 100°22.086'E), elev. 1118 m, 24 July 2012, Zhao & Chen leg. Paratypes: 1♂(SYNU-772),same data as for holotype.

Etymology.

The specific name comes from Latin, concavus, meaning hollowed, referring to the excavations of male endites.

Diagnosis.

The new species is similar to O. clavulata in having the strongly swollen palpal tibia and the pear-shaped bulb, but can be distinguished by the endites with deep excavations (Fig. 5D ) vs. straight in O. clavulata (Fig. 1E ) and the sperm duct with two loops in prolateral view (Fig. 5A ) vs. three loops in O. clavulata (Fig. 1A, B ). This new species is also similar to O. wengnan sp. nov. in having the pear-shaped bulb and the sperm duct with two loops in prolateral view, but can be distinguished by the endites with deep excavations (Fig. 5D ) vs. straight in O. wengnan sp. nov. (Fig. 14D ).

Description.

Male (holotype). Total length 1.29, carapace length 0.63, carapace width 0.46, abdomen length 0.64. Habitus as in Fig. 4A-C . Color in alcohol: carapace yellow, abdomen and legs pale yellow. Carapace oval, with net-shaped pattern, pars cephalica strongly elevated in lateral view, with rounded posterolateral corners. Clypeus (Fig. 4F ): margin unmodified, curved downwards in front view, sloping forward in lateral view. Sternum (Fig. 4G ) longer than wide, with marginal band and median area of radiating lines, surface smooth; setae sparse, needle-like, evenly scattered, without hair tufts. Mouthparts (Fig. 4F ): chelicerae straight, anterior face unmodified; labium rounded, not fused to sternum, anterior margin not indented at middle; endites (Figs 4G , 5D ) strongly sclerotized, with triangular outgrowth, outer margin with serrula and excavations. Abdomen ovoid, with gray ^-shaped pattern. Genitalia (Fig. 5A-C ): tibia of palp strongly enlarged, length/width ratio = 1.63, cymbium small; bulb pear-shaped in lateral view, with ventral side strongly protruding proximally, about 0.92 times as wide as tibia; the sperm duct strongly curved with two loops; embolus slender.

Female. Unknown.

Distribution.

Known only from the type locality.

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 4. Orchestina concava 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 5. Orchestina concava sp. nov., holotype male. A-C. Left palp, prolateral, retrolateral and dorsal views; D. Endites and labium, ventral view. Abbreviations: Exc = excavations; Se = serrula; TO = triangular outgrowth. Scale bars: 0.1 mm.

Figure 14. Orchestina wengnan sp. nov., holotype male. A-C. Left palp, prolateral, retrolateral and dorsal views; D. Endites and labium, ventral view. Abbreviation: Se = serrula. Scale bars: 0.1 mm.