Genus Orchestina Simon, 1882
Type species.
Schoenobates pavesii Simon, 1873; gender feminine.
N.B.: considered a senior synonym of Ferchestina Saaristo & Marusik, 2004: 52 (type F. storozhenkoi Saaristo & Marusik, 2004) by Platnick et al. 2012: 37.
Key to Orchestina from Xishuangbanna
O. concava, O. menglun, O. subclavulata and O. wengnan females unknown.
| 1 | Male | 2 |
| - | Female | 9 |
| 2 | Bulb oval or roughly triangle shaped, embolus base thinner (Figs 7E, F, 12A, B) | 3 |
| - | Bulb pear-shaped in lateral view, with ventral side strongly protruding proximally, embolus base thicker (e.g., Fig. 1A-C) | 4 |
| 3 | Bulb oval shaped (Fig. 12A, B); chelicerae with distal group of long converging setae (Fig. 10F); tibia I with a group of ventrobasal spines (Fig. 10D) | O. truncatula Tong & Li, 2011 |
| - | Bulb triangle shaped (Fig. 7E, F); chelicerae with distal single long setae (Fig. 2D, F); tibia I without the aforementioned character | O. colubrina Liu, Henrard & Xu, 2019 |
| 4 | Palpal tibia distinctly narrower than bulb (Fig. 7A, B) | O. menglun sp. nov. |
| - | Palpal tibia strongly enlarged, at least as wide as bulb (e.g., Fig. 1A-C) | 5 |
| 5 | Sperm duct with 2 loops in prolateral view (Figs 5A, 14A) | 6 |
| - | Sperm duct with 3 loops in prolateral view (Figs 1A, 9A, 16A) | 7 |
| 6 | Endites with deep excavations (Figs 4G, 5D) | O. concava sp. nov. |
| - | Endites without deep excavations (Figs 13G, 14D) | O. wengnan sp. nov. |
| 7 | Embolus with conspicuous dorsal flattened extension and acute tip (Fig. 16A-C) | O. xui sp. nov. |
| - | Embolus gradually tapered (Figs 1A-D, 9A-C) | 8 |
| 8 | Endites with large triangular outgrowth (Fig. 9D) | O. subclavulata sp. nov. |
| - | Endites lacking triangular outgrowth (Fig. 1E) | O. clavulata Tong & Li, 2011 |
| 9 | Genitalia with posterior plate (PP); anterior uterine sclerite (AUS) with lateral protrusion (Pr) well developed (Fig. 18D) | 10 |
| - | Genitalia with two dorsolateral extensions (Ex) surrounding anterior uterine sclerite (AUS); AUS with lateral protrusion (Pr) reduced (Figs 3I, 12F) | 11 |
| 10 | Epigaster with two small, dark sclerotized pockets (Fig. 18C) | O. xui sp. nov. |
| - | Epigaster without two small, dark sclerotized pockets (Tong and Li 2011: fig. 4B) | O. clavulata Tong & Li, 2011 |
| 11 | Epigaster with distinctly medial marks in ventral view (Fig. 11G); anterior uterine sclerite (AUS) short, length/width ratio about 1.25 (Fig. 12F) | O. truncatula Tong & Li, 2011 |
| - | Epigaster without distinctly medial marks in ventral view (Fig. 3G); anterior uterine sclerite (AUS) long, length/width ratio about 2.0 (Fig. 3H, I) | O. colubrina Liu, Henrard & Xu, 2019 |