Speocera xuanson Li & Li 2019, sp. nov.

Speocera xuanson Li & Li sp. nov. (Figs 51–52, 57I–J)

Material examined. Holotype ♂ (IZCAS), Vietnam, Xuan Son National Park, Lun Cave (21º7.022′N, 104º57.443′E), elev. 398 m, 16.X.2012, leg. H. Zhao. Paratypes 2♂ 3♀ (IZCAS), same data as holotype.

Etymology. The specific name is derived from the type locality; noun.

Diagnosis. The new species is similar to S. bicornea Tong & Li, 2007, but males can be distinguished by the long associated sclerites of the embolus (Figs 51A–B) and females by the long afferent spermathecae extending to the upper sides of the abdomen (Figs 52B, D). S. bicornea males do not have the long associated sclerites of the embolus, and the females have short afferent spermathecae, not extending to upper sides of the abdomen (Tong & Li, 2007: fig. 7).

Description. Male. Total length 1.10; carapace length 0.48; carapace width 0.43; abdomen length 0.58; abdomen width 0.40. Prosoma: carapace pyriform, narrowing gradually anteriorly; shiny, light yellow, suffused with brownish pattern (Fig. 52C); pars cephalica flat; fovea not visible. Sternum yellow, suffused with brown, as long as wide. Endites light yellow with serrula; labium light yellow. Clypeus nearly vertical; short. Chelicerae light yellow, laterally strongly excavated, with a small horn-shaped apophysis; promargin with a series of six teeth reaching the lamina; retromargin with two very small denticles (Figs 57I–J). Eyes: six contiguous eyes surrounded by black pigmentation; PME smallest; PLE largest (Fig. 52C). Opisthosoma oval; light brown. Legs missing. Genitalia (Fig. 51). Palpal femur long; palpal tibia as long as cymbium (Figs 51A–B). Cymbium conical, with large prolateral extension basally. Bulb spherical, wider than high. Embolus wide, dark and basally with one long associated sclerite; sperm duct initially very wide, gradually narrowing distally (Fig. 51D).

Female. Total length 1.25; carapace length 0.51; carapace width 0.43; abdomen length 0.68; abdomen width 0.46. Similar to male in color and general features (Figs 52D–E) but larger. Chelicerae unmodified. Legs I, II, III missing; leg IV 2.06 (0.59, 0.15, 0.58, 0.42, 0.32). Genitalia. Internal genitalia with afferent spermathecae long, extending past the sides of the abdomen (Fig. 52B); spermathecae oval (Fig. 52A).

Distribution. Known only from the type locality.