Singaporemma shenzhen Lin & Li, 2022

Lin, Yejie, Zhao, Huifeng, Koh, Joseph K H & Li, Shuqiang, 2022, Taxonomy notes on twenty-eight spider species (Arachnida: Araneae) from Asia, Zoological Systematics 47 (3), pp. 198-270 : 246-257

Singaporemma shenzhen Lin & Li , sp. nov. ( Figs 48–51 )

Diagnosis. The males of this new species can be distinguished from all other Singaporemma species by the embolus spiraling at 720°. Females of this new species differ from S. takensis Yan & Lin, 2018 , S. singulare Shear, 1978 and S. lenachanae Lin & Li, 2017 by the presence of a central process (vs. absent); from S. bifurcata Lin & Li, 2010 and S. wulongensi s Lin & Li, 2014 by having a nearly oval-shaped inner vulval plate (vs. “Ω”-shaped).

Description. Male (holotype, Figs 50A, C, E , 51A ). Total length 1.10; carapace 0.51 long, 0.48 wide, 0.45 high; abdomen 0.64 long, 0.62 wide, 0.44 high. Carapace: dark red, carapace finely reticulated; six eyes, white with black ocular base, ALE>PLE>PME, ALE and PLE adjacent, anterior eye row slightly recurved; cephalic part raised, top flat; clypeus high, sloping forward, with sparse setae, marginally rectangular; chelicerae lacking horns or processes, cheliceral lamina well developed; endites basally wide, distally narrow, labium triangular, distally blunt; sternum finely reticulated, scutellate, marginally rugose, posterior corner truncated. Leg cuticle striated; yellowish brown. Leg measurements: I 1.20 (0.37, 0.40,

0.21, 0.22), II 1.16 (0.40, 0.37, 0.19, 0.20), III 1.04 (0.33, 0.30, 0.21, 0.20), IV 1.38 (0.43, 0.44, 0.26, 0.25). Abdomen: dark red, dorsal scutum oval, finely reticulated, posteriorly truncated; ventral scutum reticulated; lateral scutum I long, extending beyond posterior margin of preanal scutum; perigenital scutum absent; postgential scutum slightly procurved, mesially narrow, laterally wide; preanal scutum approximately oblong.

Palp ( Fig. 48 ). Patella short, proximally narrow, distally wide; tibia large, extremely swollen, about 3 times wider than femur; cymbium triangular in lateral view, bearing long setae; bulb almost triangular, surface smooth; embolus long, tubular, distinctly sclerotized, originating from middle position of bulb; embolic tip sharply pointed, lamellar.

Female (IZCAS-Ar43317, Figs 50B, D, F , 51B ). Total length 1.52; carapace 0.60 long, 0.49 wide, 0.50 high; abdomen 0.97 long, 0.77 wide, 0.60 high. Leg measurements: I 1.19 (0.37, 0.38, 0.20, 0.24), II 1.21 (0.39, 0.39, 0.20, 0.23), III 1.14 (0.35, 0.36, 0.20, 0.23), IV 1.40 (0.41, 0.47, 0.26, 0.26). Habitus similar to that of male.

Epigyne and vulva ( Fig. 49 ). Epigynal pit distinct, opening at margin of pulmonary scutum; vulval posterior margin stronglsy sclerotized; vulval stem almost triangular; vulval duct long and wide, translucent; lateral horns sclerotized, Vshaped, distally reflexed; spermatheca rugose, transparent, and membranous; inner vulval plate transversely almost oval, strongly sclerotized, narrower than central process; central process oval.

Material examined. Holotype ♂ (IZCAS-Ar43316) , China: Guangdong: Shenzhen City, Longhua district, Yangtaishan Forest Park , Longxi Pavilion (22.6643°N, 113.9749°E), 19 April 2021, Q. Lu leg. Paratype. 1♀ (IZCAS-Ar43317) , 26 May 2021, Y. Wang leg., others same as holotype.

Distribution. Known only from the type locality.

Etymology. The specific name is a noun in apposition taken from the type locality.

Figures

Figure 48. Singaporemma shenzhen Lin & Li, sp. nov., holotype male, left palp. A. Retrolateral view; B. Prolateral view. Abbreviations: Cy—cymbium; E—embolus; Et—embolic tip; Pb—bulb; Ti—tibia. Scale bars=0.1mm.

Figure 49. Singaporemma shenzhen Lin & Li, sp. nov., paratype female. A. Genital area, ventral view; B. Cleared vulva, dorsal view. Abbreviations: AV—anterior ventrolateral plate; CP—central process; EPi—epigynal pit; IVP—inner vulval plate; LH—lateral horn; PA—preanal plate; POG—postgenital plate; S—spermatheca; VD—vulval duct; VS—vulval stem. Scale bars=0.1mm.

Figure 50. Singaporemma shenzhen Lin & Li, sp. nov., habitus. A–B. Dorsal view; C–D. Ventral view; E–F. Lateral view. Scale bars =0.3mm.

Figure 51. Singaporemma shenzhen Lin & Li, sp. nov., live specimens. A–B. Holotype male; B. Paratype female. Photos: Qianle Lu (A) and Yiduo Wang (B).