Qiongocera luoxuan Li & Li

Chang, Wan-Jin, Li, Fengyuan & Li, Shuqiang, 2019, On the genera Qiongocera and Relictocera (Araneae, Psilodercidae) from Southeast Asia, ZooKeys 862, pp. 61-79 : 63

Qiongocera luoxuan Li & Li sp. nov. Figs 1B, C, E, 4, 5, 12A, 13

Types.

Holotype: ♂ (IZCAS), China, Hainan Province, Dongfang City, Donghe Town, Yalong Village, Yalong-Huangxian Cave, 18°58.752'N, 108°53.308'E, 264 m, 15.XII.2014, Zhao Q. and Shao L. Paratypes: 1♂1♀ (IZCAS), same data as holotype.

Etymology.

The species name is a noun in apposition derived from the Chinese pinyin “luόxuán” (helical) and refers to the helical shape of the bulb in the distal half.

Diagnosis.

Males of Q. luoxuan sp. nov. can be distinguished from Q. hongjunensis by the triangular process on the bulb (Fig. 5B) (vs. a plier-like process with 2 unequal parts in Q. hongjunensis ); the distal half of the bulb helical (Fig. 5C, D) (vs. a rather simple pyriform bulb in Q. hongjunensis ); females can be distinguished by the pair of thin, complex branches of the spermathecae that are convexly curved (Fig. 4A) (vs. a pair of bulging round spermathecae in Q. hongjunensis ); the coloration and patterns of both male and female are relatively indistinct (Fig. 4 C–E) (vs. a distinct dark brown coloration and pattern in Q. hongjunensis ).

Description.

Male (Holotype). Total length 2.65; carapace 1.09 long, 1.13 wide; abdomen 1.56 long, 0.78 wide. Carapace round and pale yellow with a faint longitudinal brown patch medially (Fig. 4C). Fovea shallow and brown. Anterior part of the thoracic region distinctly elevated. Chelicerae yellow. Cheliceral promargin with lamina bearing 3 triangular extensions, retromargin with 2 small teeth (Fig. 12A). Clypeus slanting, dark brown with two pale areas laterally. Endites pale yellow. Labium slanting, light brown. Sternum circular with brown complex pattern delimiting two pale oval areas anteriorly and posteriorly. Abdomen dorsum with several dark horizontal stripes concentrated posteriorly, venter with dark curves concentrated at the edges. Legs uniformly brown; measurements: I 18.75 (5.45, 0.40, 5.77, 5.13, 2.00), II 14.02 (4.00, 0.40, 4.49, 3.53, 1.60), III missing, IV missing. Palp (Fig. 5 A–D): femur slender, 5 times longer than patella; patella angled ventrally; tibia pale, 2 times shorter than femur, suffused with tiny sepia patches, strongly deflected prolaterally; cymbium pale, darker distally, with dorsal margin curved basally, with short, pale distal protrusion, conical in lateral view and directed at 45 °; length/width ratio = 2.0; bulb light yellow, proximal half roughly cylindrical, distal half twisted, forming 3 helical coils tapered apically, ending at a pointed laminar apophysis; triangular process adjacent to embolus short; embolus thin, sharp and darkened, extending from distal part of the bulb (Fig. 5B).

Female (Paratype). General features and coloration similar to that of male (Fig. 4 D–E). Measurements: total length 2.60; carapace 1.00 long, 1.00 wide; abdomen 1.60 long, 0.80 wide. Leg measurements: I 12.85 (3.50, 0.40, 3.75, 3.40, 1.80), II missing, III 7.16 (2.00, 0.31, 2.19, 1.72, 0.94), IV 10.39 (3.20, 0.30, 3.30, 2.50, 1.09). Internal genitalia: one pair of sclerotized ovoid spermathecae surrounded by a pair of thin ducts with complex branches curving convexly, posteriorly with horizontal bar bearing droplet-shaped ducts (Fig. 4A).

Distribution.

Known only from the type locality (Fig. 13).