Xantharia cucphuong Chu & Li, 2023

Chu, Chang, Li, Shuqiang, Yao, Yanbin & Yao, Zhiyuan, 2023, One new genus and four new species of Liocranidae Simon, 1897 (Arachnida, Araneae) from China and Vietnam, ZooKeys 1181, pp. 219-240 : 219

Xantharia cucphuong Chu & Li sp. nov.

Figs 9 , 10 , 11C

Type material.

Holotype: 1♂ (IZCAS-Ar44625), Vietnam, Ninh Binh, Cuc Phuong National Park, 20°20.568′N, 105°36.024′E, 408 m, hand catch in leaf litter, 8 October 2007, D.S. Pham leg.

Etymology.

The specific name refers to the type locality and is a noun in apposition.

Diagnosis.

The new species resembles X. galea Zhang, Zhang & Fu, 2010 (cf. Figs 9 , 10 , 11C and Zhang et al. 2010: 66, figs 1-11) by the similar membranous conductor (Fig. 9A-C ) and sclerotized subtegulum (Fig. 9A, B ). Males can be distinguished by the embolic tip membranous, wide, nearly quadrangular (Fig. 9A-C ; vs. embolic tip sclerotized, thin and filiform), by the palp with tegular apophysis (Fig. 9A-C ; absent), by the sperm duct separated from the base of tegulum by nearly double the width of the sperm duct (Fig. 9B ; vs. sperm duct extending to the base of tegulum), and by the retrolateral tibial apophysis long and straight (Fig. 9A-C ; vs. retrolateral tibial apophysis short and beak-shaped retrolaterally). Female unknown.

Description.

Male (holotype; Figs 10A-C , 11C ). Total body length 6.73, carapace 2.69 long, 1.95 wide, opisthosoma 4.04 long, 1.49 wide. Eye sizes and interdistances: AME 0.13, ALE 0.14, PME 0.10, PLE 0.13; AME-AME 0.07, AME-ALE 0.03, PME-PME 0.18, PME-PLE 0.15, AME-PME 0.12, ALE-PLE 0.07. Carapace reddish-brown, darker in ocular area, without pattern; fovea reddish-brown. Chelicerae reddish-brown, with several setae on anterior surface, with two promarginal and two retromarginal teeth. Endites reddish-brown, longer than wide, widest anteriorly, concave laterally, with diagonal depression in middle, subapically with semicircular membranous area and dense scopula. Labium reddish-brown, nearly isosceles trapezoidal, with constriction subbasally and scopula apically. Sternum reddish-brown without pattern, narrowing anteriorly, with precoxal triangles and intercoxal extensions. Legs yellowish-brown without pattern; legs I distinctly darker and stouter than legs II-IV. Leg spination: femora II pl 2 do 1, III pl 1 do 1 rl 1, IV do 2; tibia III pl 2 rl 1 rlv 2; metatarsus III pl 2 rl 2 plv 2 rlv 2. Palp and leg measurements: palp 2.52 (0.92, 0.40, 0.43, -, 0.77), I 7.31 (2.04, 1.17, 1.74, 1.68, 0.68), II 6.55 (1.83, 0.99, 1.51, 1.58, 0.64), III 5.74 (1.65, 0.67, 1.34, 1.39, 0.69), IV - (1.77, -, -, -, -). Dorsal opisthosoma grey, posteriorly yellow occupying about half of dorsal surface, with dark patterns. Lateral opisthosoma with dark spots. Ventral opisthosoma grey with dark margin around spinnerets. Spinnerets yellow.

Palp (Fig. 9A-C ). Retrolateral tibial apophysis long and straight, with wide base and narrow, blunt tip. Bulb oval, subtegulum sclerotized, visible in ventral view; sperm duct distinct, separated from the base of tegulum by nearly double the width of the sperm duct. Embolus originating 9:00 o’clock, embolic base wide and elliptical, sclerotized along margin; embolic tip membranous, nearly quadrangular, situated distally. Conductor membranous, nearly fan-shaped, originating distally to bulb. Tegular apophysis membranous and triangular, weakly sclerotized along margin.

Distribution.

Vietnam (Ninh Binh, type locality; Fig. 12 ).

Figures

Figure 9. Xantharia cucphuong sp. nov., holotype male (A-C) palp A prolateral view B ventral view C retrolateral view. Abbreviations: C = conductor, E = embolus, EB = embolus base, RTA = retrolateral tibial apophysis, SD = sperm duct, ST = subtegulum, TA = tegular apophysis. Scale bar: 0.50 mm.

Figure 10. Xantharia cucphuong sp. nov., holotype male (A-C) habitus A dorsal view B lateral view C ventral view. Scale bar: 2.00 mm.

Figure 11. Ocular areas and tapeta of liocranids. A Sinocranum menghai sp. nov. B Xantharia baizilongi sp. nov., inset shows oblique tapetum of PME C X. cucphuong sp. nov. Scale bars: 0.50 mm (A); 0.20 mm (B, C).

Figure 12. New distribution records of liocranid spiders from China and Vietnam 1 Koppe ninger sp. nov. 2 Sinocranum menghai sp. nov. 3 Xantharia baizilongi sp. nov. 4 X. cucphuong sp. nov.