Chalcovietnamicus terbakar Yu, Maddison & Zhang, sp. nov. (Kffiḋff)

Figs 70–87

Type material. Holotype: ♁ (UBCZ; KYU-SAL450), SINGAPORE: Sungei Buloh Wetland Reserve, 1.440– 1.447°N, 103.730– 103.735°E, 10 June 2019, leg. W. Maddison & N. Morehouse, WPM#19-045 . Paratype: 1♀ (UBCZ; KYU-SAL451), same data as holotype .

Other material examined. 3♁ (UBCZ; KYU-SAL452), same data as holotype .

Etymology. The specific epithet is from Malay, meaning “burnt”, corresponding to the color of the new species that looks like it has been burned.

Diagnosis. It can be recognized from other congeners of daiqini -group by its dark color (Figs 70–74). The male can be distinguished from all other congeners by the S-shaped embolus (Fig. 80; vs. not S-shaped in other species). The female resembles C. logunovi sp. nov. by the relatively short copulatory ducts, but it can be distinguished by the relatively low turning point of copulatory ducts which is close to the spermathecae (Fig. 83; vs. the turning point is at the median part of copulatory ducts in C. logunovi sp. nov.).

Description. Male. Habitus as shown in Fig. 75. Measurements of holotype (KYU-SAL450): carapace length 2.05; abdomen length 1.98; measurements of eyes: AME 0.43, ALE 0.27, PME 0.05, PLE 0.22; measurements of legs: I 4.91 (1.55, 1.10, 1.10, 0.70, 0.46), II 3.11 (1.00, 0.53, 0.56, 0.61, 0.41), III 3.10 (1.00, 0.47, 0.57, 0.64, 0.42), IV 3.37 (1.00, 0.48, 0.76, 0.68, 0.45); leg formula 1423. Endite with anterior lateral subtriangular extension (Fig. 78). Color (Figs 70–72): Body dark, covered with dense dark khaki setae except for face, palp and tibia I, these parts conspicuously black compared to other body parts; abdominal pattern indistinct.

Palp as in Figs 80–81, 84–85: Cymbium slightly longer than palpal bulb in length, cymbial process (CyP) present, slightly visible in ventral view of palp; tegular lobe small and stout, slightly sticking out of tegulum; Sshaped embolus sticking out of embolic disc; embolic disc hidden behind bulb.

Female. Habitus as shown in Fig. 76. Measurements of paratype (KYU-SAL451): carapace length 1.73; abdomen length 1.78; measurements of eyes: AME 0.39, ALE 0.25, PME 0.08, PLE 0.20; measurements of legs: I 2.83 (0.90, 0.51, 0.62, 0.43, 0.37), II 2.52 (0.80, 0.46, 0.47, 0.42, 0.37), III 2.62 (0.90, 0.42, 0.47, 0.51, 0.32), IV 2.90 (0.97, 0.42, 0.60, 0.57, 0.34); leg formula 4132. Body form and color like male, but without anterior lateral subtriangular extension and present central setal tuft on sternum (Fig. 79); dorsal abdominal pattern clearer than male, with discontinuous and hollow longitudinal light mark on axis, and three pairs of spot-like light setal bands on each side of posterior part (Fig. 30).

Vulva as in Figs 82–83, 86–87: Copulatory ducts short, curved outward; spermathecae subspherical, with accessory glands (AG) attached at its base.

Distribution. Known only from the type locality of Singapore.