Sinostidia dujiao Yu & Li, 2021

Zhang, Jianshuang, Yu, Hao & Li, Shuqiang, 2021, On the clubionid spiders (Araneae, Clubionidae) from Xishuangbanna, China, with descriptions of two new genera and seven new species, ZooKeys 1062, pp. 73-122 : 73

Sinostidia dujiao Yu & Li sp. nov.

Figs 23 , 24

Type material.

Holotype: ♂ (IZCAS-Ar34736), China: Yunnan: Xishuangbanna: Mengla County: Menglun Town: Menglun Nature Reserve: 48 km landmark, seasonal rainforest (21°58.704'N, 101°19.748'E, 1080 m), 12 August 2011, G. Zheng leg. Paratype: 1♀ (IZCAS-Ar34737, YHCLU0090), same data as holotype.

Other material examined.

1♂ (YHCLU0132), same data as the holotype .

Etymology.

The specific name is derived from the Chinese pinyin dú ji ǎ o, which means one-horned, referring to the unbranched tegular apophysis; noun in apposition.

Diagnosis.

Males of the new species are similar to those of S. shuangjiao sp. nov. but can be distinguished by the unbranched tegular apophysis, wide and conical embolar tip, and by the thick and partly membranous conductor (Fig. 23A-E ) (vs. tegular apophysis bifurcate, embolar tip filamentous, conductor thin and entirely membranous as in Fig. 21A-E ). Females of S. dujiao sp. nov. differ from those of S. shuangjiao sp. nov. by the reniform bursae larger than spermathecae (Fig. 24C, D ) (vs. globular bursae smaller than the spermathecae as in Fig. 22C, D ), the CO situated anteriorly and the CD located on central portion of epigyne (vs. both situated laterally in S. shuangjiao sp. nov. (cf. Figs 24A-D and 22A-D )).

Description.

Male (holotype) (Fig. 24E, F ). Total length 4.90; carapace 2.17 long, 1.50 wide; opisthosoma 2.73 long, 0.97 wide. Carapace oval, pars cephalica distinctly narrowed; yellowish white, slightly darker frontally, without distinct pattern; fovea reddish. Eyes: in dorsal view, PER slightly wider than AER, both AER and PER slightly recurved. Eye sizes and interdistances: AME 0.12, ALE 0.12, PME 0.12, PLE 0.10, AME-AME 0.09, AME-ALE 0.03, PME-PME 0.16, PME-PLE 0.13, MOQL 0.28, MOQA 0.29, MOQP 0.43. Chelicerae red-brown, with 3 promarginal and 2 retromarginal teeth. Labium, endites light brown. Sternum yellowish. Legs yellowish white. Leg measurements: I - (1.85, -, -, -), II 6.79 (2.00, 2.25, 2.04, 0.51), III - (1.34, 1.35, 0.82, -), IV - (1.88, 2.20, 1.23, -). Abdomen (Fig. 24E, F ) lanceolate, dorsally white with longitudinal, grey heart mark, extended 2/5 length of abdomen; venter white; spinnerets without distinct markings.

Palp (Fig. 23A-E ). Retrolateral tibial apophysis partly membranous, ~ 1/3 of tibia length, with a pointed apex; ventral tibial apophysis digitiform and sclerotised, ~ 1/3 of palpal tibia length, with blunt tip. Bulb nearly spherical, ~ 1.6 × longer than wide, sperm duct distinct, sinuate, reverse S-shaped in ventral view. Tegular apophysis triangular, longer than 2/3 tegulum width, located ventrally on distal margin of tegulum, with sharp apex, covering embolic base. Embolus thick, wrapped around tegulum dorsally, tip directed antero-mesally, embolic base nearly as long as free (conical) part of embolus. Conductor thick, small, <1/2 embolus length, originating retrolaterally on tegulum, partly membranous distally.

Female (paratype IZCAS-Ar34737). Total length 4.79; carapace 2.28 long, 1.60 wide; opisthosoma 2.51 long, 1.29 wide. General colouration darker than in male (Fig. 24G, H ). Eye sizes and interdistances: AME 0.10, ALE 0.14, PME 0.12, PLE 0.13, AME-AME 0.05, AME-ALE 0.06, PME-PME 0.16, PME-PLE 0.14, MOQL 0.35, MOQA 0.30, MOQP 0.44. Legs uniformly white. Leg measurements: I 5.04 (1.35, 2.10, 1.04, 0.59), II 5.06 (1.56, 1.98, 0.92, 0.60), III 4.36 (1.36, 1.48, 1.06, 0.47), IV 6.75 (2.03, 2.18, 1.95, 0.60).

Epigyne (Fig. 24A-D ): Plate nearly as wide as long, with large, trapezoidal atrium as broad as plate. Atrium anteriorly bounded by margin, not rebordered posteriorly. Copulatory ducts, bursae distinctly visible through integument. Copulatory openings small, indistinct, on anterior atrial border. Copulatory ducts separated by ~ one diameter, descend posteriorly, then connect with bursae. Spermathecae with bean-shaped proximal part (head) and papilliform distal part (base), separated by ~ 2.7 widths. Bursae reniform, close together, distinctly larger than spermathecae, 1.2 × longer than wide. Fertilisation ducts acicular, no> 1/4 of spermathecae length, located dorsobasally on spermathecae.

Distribution.

Known only from the type locality.

Figures

Figure 21. Male palp of the holotype of Sinostidia shuangjiao sp. nov. A prolateral view B retrolateral view C bulb, prolateral view D bulb, ventral view E bulb, retrolateral view. Abbreviations: C = conductor; E = embolus; EB = embolic base; RTA = retrolateral tibial apophysis; TA = tegular apophysis; VTA = ventral tibial apophysis. Scale bars: 0.10 mm (equal for A, B, equal for C-E).

Figure 22. Sinostidia shuangjiao sp. nov., female paratype and male holotype, epigyne (A-D), male habitus (E, F) and female habitus (G, H) A intact, ventral view B cleared, ventral view C cleared, dorsal view D cleared, dorsal view E dorsal view F lateral view G dorsal view H ventral view. Abbreviations: BS = bursa; CD = copulatory duct; CO = copulatory opening; SB = spermathecal base; SH = spermathecal head; SP = spermatheca. Scale bars: 0.10 mm (equal for A-D); 1 mm (equal for E, F, equal for G, H).

Figure 23. Male palp of the holotype of Sinostidia dujiao sp. nov. A prolateral view B retrolateral view C bulb, prolateral view D bulb, ventral view E bulb, retrolateral view. Abbreviations: C = conductor; E = embolus; EB = embolic base; RTA = retrolateral tibial apophysis; TA = tegular apophysis; VTA = ventral tibial apophysis. Scale bars: 0.10 mm (equal for A, B, equal for C-E).

Figure 24. Sinostidia dujiao sp. nov., female paratype and male holotype, epigyne (A-D), male habitus (E, F) and female habitus (G, H) A intact, ventral view B cleared, ventral view C cleared, dorsal view D cleared, dorsal view E dorsal view F lateral view G dorsal view H ventral view. Abbreviations: BS = bursa; CD = copulatory duct; CO = copulatory opening; SB = spermathecal base; SH = spermathecal head; SP = spermatheca. Scale bars: 0.10 mm (equal for A-D); 1 mm (equal for E, F, equal for G, H).