Nusatidia changao 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

Nusatidia changao Yu & Li sp. nov.

Figs 11 , 12

Type material.

Holotype ♂ (IZCAS-Ar34731), China: Yunnan: Xishuangbanna: Mengla County: Menglun Town: Menglun Nature Reserve: Secondary tropical montane evergreen broad-leaved forest (21°57.528'N, 101°12.384'E, 899 m), 6 August 2007, G. Zheng leg. Paratype: 1♀ (IZCAS-Ar34732), same data as holotype.

Other material examined.

China: Yunnan: Xishuangbanna: Mengla County: Menglun Town : Menglun Nature Reserve : 1♂ (YHCLU0152), 48 km landmark in Nature Reserve , seasonal rainforest (21°58.704'N, 101°19.748'E, 1080 m), 12 August 2011, G. Zheng leg. ; Mengyang Town: Nabanhe Nature Reserve : 1♀ (YHCLU0129), waterfall, seasonal rainforest (22°7.607'N, 100°40.540'E, 730 m), 22 August 2012, G. Zheng leg.

Etymology.

The specific name is derived from the Chinese pinyin cháng áo, meaning long chelicerae, referring to the enlarged chelicerae of the male, which are approximately as long as the carapace; noun in apposition.

Diagnosis.

Males of N. changao sp. nov. resemble those of N. borneensis Deeleman-Reinhold, 2001 and N. snazelli Deeleman-Reinhold, 2001 in having a similar embolus draped around the tegulum but differ by the tibial apophysis, which has a flange with jagged teeth like those on a saw (Fig. 11B ) (vs. smooth flange). Females of N. changao sp. nov. can be easily recognised by the lateral margins of the epigynal plate with copulatory openings under deep slits (Fig. 12A-D ) (vs. epigynal plate without lateral slits, copulatory openings located posteriorly). Males of this new species also can be easily recognised by the enlarged chelicerae, ~ as long as the carapace (Fig. 12E ) (vs. chelicerae unmodified, <1/2 of carapace length).

Description.

Male (holotype) (Fig. 12E, F ): Total length 3.98; carapace 1.70 long, 1.48 wide; opisthosoma 2.29 long, 0.92 wide. Carapace red wine coloured, pars cephalica darker in ocular area, without distinct pattern; ocular region distinctly narrowed; cervical groove indistinct; tegument smooth, with short setae. Eyes: AER almost straight, PER wider than AER and slightly procurved in dorsal view. AME dark, other eyes light; with black rings. Eye sizes and interdistances: AME 0.10, ALE 0.14, PME 0.14, PLE 0.11, AME-AME 0.04, AME-ALE 0.08, PME-PME 0.21, PME-PLE 0.12, MOQL 0.34, MOQA 0.28, MOQP 0.45. Chelicerae protruded, approximately equal in length to carapace, coloured as ocular area, with five promarginal and two retromarginal teeth. Labium and endites coloured as chelicerae. Sternum yellowish white. Legs white. Leg measurements: I 8.12 (2.23, 3.37, 1.72, 0.80), II 9.28 (2.56, 3.88, 1.99, 0.85), III 6.24 (1.81, 2.01, 1.79, 0.58), IV 8.93 (2.46, 2.96, 2.72, 0.79). Abdomen (Fig. 12E, F ) dorsum yellowish white, dorsally with a wide scutum extended ~ 1/2 of abdomen length, gradually widened posteriorly, two pairs of inconspicuous sigilla on either side; venter, spinnerets light yellow.

Palp (Fig. 11A-E ): Tibia relatively long, ~ 1/2 cymbium length; RTA stout, ~ 1/3-1/4 tibia length, with broad base and flange with jagged teeth like those on a saw. Bulb spherical, nearly as wide as long, sperm duct inconspicuous. Embolus at least 3 × longer than tegulum, originating at centre of tegulum, draped around the tegulum, tapered to filiform, tip extended to anterior portion of tegulum, directed to 12 o’clock. Conductor large, membranous, at ~ 11 o’clock position.

Female (paratype IZCAS-Ar34732): Total length 4.89; carapace 1.93 long, 1.45 wide; opisthosoma 2.97 long, 1.46 wide. Similar to males but with distinctly smaller chelicerae and longer body (Fig. 12G, H ). Eye sizes and interdistances: AME 0.08, ALE 0.09, PME 0.11, PLE 0.12, AME-AME 0.04, AME-ALE 0.06, PME-PME 0.18, PME-PLE 0.12, MOQL 0.30, MOQA 0.25, MOQP 0.41. Leg measurements: I 6.45 (1.89, 2.63, 1.26, 0.68), II 6.73 (1.92, 2.80, 1.34, 0.68), III 5.09 (1.62, 1.51, 1.43, 0.53), IV 7.28 (2.04, 2.25, 2.30, 0.69).

Epigyne (Fig. 12A-D ): Plate trapezoidal, broad, nearly as wide as long, lateral margins concave medially, forming 2 windows. Copulatory openings inconspicuous, located at windows. Hyaline copulatory ducts long, strongly convoluted, proximally enlarged, cup-shaped, ducts ascending obliquely to middle, expanded laterally, then retracing anteriorly to form oblique arch, descending posteriorly to spermathecae. Spermathecae peanut-shaped, centrally located, separated by 1.5 diameters of a spermatheca. Bursae oblong, hyaline, situated posteriorly, close together, ~ 1.5 × wider than long, surface translucent, smooth. Fertilisation ducts acicular, originating on posterior surface of spermathecae.

Distribution.

Known only from the type locality.

Figures

Figure 11. Male palp of the holotype of Nusatidia changao sp. nov., left palp (A, B) and flipped right bulb (C-E) 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. Scale bars: 0.10 mm (equal for A, B, equal for C-E).

Figure 12. Nusatidia changao 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; path of copulatory duct marked E dorsal view F lateral view G dorsal view H ventral view. Abbreviations: BS = bursa; CD = copulatory duct (dashed line showing schematic course of copulatory duct, dorsal); CO = copulatory opening; FD = fertilization duct; SP = spermatheca. Scale bars: 0.10 mm (equal for A-D); 1 mm (equal for E, F, equal for G, H).