Stertinius fanjingensis, Wang & Mi & Irfan & Peng, 2020

Wang, Cheng, Mi, Xiao-Qi, Irfan, Muhammad & Peng, Xian-Jin, 2020, On two species of the spider genus Stertinius Simon, 1890 from China (Araneae: Salticidae), Zootaxa 4786 (2), pp. 295-300 : 295-298

Stertinius fanjingensis sp. nov. ( Figs 1 A–C, 2, 4A–G)

Type material. Holotype: ♂, CHINA: Guizhou, Yinjiang County, Yongyi Township, Dazhiyuan Village , Fanjing Mountain National Nature Reserve , 27.914813°N, 108.669436°E, alt. 1994 m, 17 July 2015, Cheng Wang, Ming-yong Liao, Tian-jun Liu, Gao-tao Liu, Xing Kuang & Peng Luo leg. (Tongren University 20150717-0005) . Paratypes: 2 ♂ 1 ♀, same data as holotype (Tongren University 20150717-0006–20150717-0008) .

Etymology. The specific name (adjective) refers to the type locality, Fanjing Mountain National Nature Reserve.

Diagnosis. The male of this new species resembles that of S. kumadai Logunov, Ikeda & Ono, 1997 ( Figs 1 D–F, 3, 4H–J) in body shape and palp structure, but can be distinguished by: 1) RTA sheet-shaped in retrolateral view ( Figs 2C , 4B ), whereas beak-shaped in S. kumadai ( Figs 3C , 4J ); 2). The female resembles that of S. niger Merian, 1911 (see Logunov, Ikeda & Ono 1997: 13, figs 24–26), but can be distinguished by the anterior chamber of spermathecae spherical, extending forward to anterior out margin of epigyne ( Figs 2E , 4G ), whereas eggplant-shaped, extending backwards and close to the posterior margin of epigyne in S. niger ; the female also resembles that of S. borneensis Logunov, 2018 , but can be distinguished by the shallower hood and the more separate copulatory openings ( Figs 2D , 4 E–F).

Description. Male (holotype). Total length 2.62. Prosoma 1.23 long, 1.06 wide. Opisthosoma 1.43 long, 1.31 wide. Eye sizes and interdistances: AME 0.29, ALE 0.14, PLE 0.13, AME–AME 0.02, AME–ALE 0.04, AREW 0.88, PERW 1.01, EFL 0.62. Legs: I 2.15 (0.72, 0.88, 0.31, 0.24); II 1.69 (0.57, 0.63, 0.25, 0.24); III 1.52 (0.55, 0.50, 0.24, 0.23); IV 1.94 (0.71, 0.71, 0.28, 0.24). Prosoma ( Fig. 1A ) almost quadrate, reddish-brown, the eyes field darker, densely covered with white setae. Fovea and radial grooves invisible. Chelicerae ( Figs 1C , 4C ) reddish-brown, with 2 small promarginal and 1 large retromarginal teeth. Endites ( Fig. 1C ) longer than wide, the inner side with scopulae. Labium ( Fig. 1C ) dark brown, the apex pale and with bristles. Sternum ( Fig. 1C ) reddish-brown, the rim covered with thin setae. Legs ( Figs 1A, 1C ) with setae, yellow to reddish-brown, leg I most robust. Opisthosoma ( Figs 1A, 1C ) oval, the dorsum ( Fig. 1A ) yellowish-brown, with a longitudinal irregular brown stripe, alternate light and brown stripes and three pairs of sigillae, covered by a large scutum and dense white setae; the ventral side ( Fig. 1C ) brown, with three longitudinal brown stripes medially, covered by thin setae. Palp ( Figs 2 A–C, 4A–B): tibia wider than long, RTA sheet-shaped with pointed tip in ventral view. Cymbium longer than wide, the base with a lamellar process close to RTA. Bulb oval, with spermatophore duct extending along the margin. Embolus slender, arises from the plate-like base, superimposes on the surface of the bulb.

Female (paratype, 20150717-0008). Total length 3.28. Prosoma 1.31 long, 1.01 wide. Opisthosoma 1.98 long, 1.39 wide. Eye sizes and interdistances: AME 0.28, ALE 0.13, PLE 0.12, AME–AME 0.01, AME–ALE 0.03, AREW 0.78, PERW 0.98, EFL 0.57. Legs: I 1.83 (0.59, 0.75, 0.25, 0.24); II 1.53 (0.49, 0.56, 0.24, 0.24); III 1.56 (0.50, 0.57, 0.23, 0.26); IV 1.92 (0.63, 0.74, 0.29, 0.26). Characters of prosoma ( Fig. 1B ) similar to that of male. Opisthosoma ( Fig. 1B ) long oval, the dorsum ( Fig. 1B ) with a longitudinal irregular dark brown stripe, alternate light and brown stripes, three pairs of sigillae followed by several chevrons, covered by thin setae; the ventral side similar to that of male. Epigyne ( Figs 2 D–E, 4E–G): hood bell-shaped, almost as long as wide, situated posteriorly. Copulatory openings slit-like, close to the base of the hood. Copulatory ducts reduced. Spermathecae with two spherical chambers, connected by a short junction.

Distribution. Known only from Guizhou ( China).

Figures

FIGURE 1. A–C Stertinius fanjingensis sp. nov. (A male, dorsal view; B female, dorsal view; C male, ventral view). D–F Stertinius kumadai Logunov, Ikeda & Ono, 1997 (D male, ventral view; E male, dorsal view; F female, dorsal view). Scale bars = 0.5 mm.

FIGURE 2. Stertinius fanjingensis sp. nov. A–C left male palp (A prolateral view; B ventral view; C retrolateral view); D epigyne, ventral view; E vulva, dorsal view. Scale bars = 0.1 mm.

FIGURE 3. Stertinius kumadai Logunov, Ikeda & Ono, 1997. A–C left male palp (A prolateral view; B ventral view; C retrolateral view); D epigyne, ventral view; E vulva, dorsal view. Scale bars = 0.1 mm.

FIGURE 4. A–G Stertinius fanjingensis sp. nov. A–B left male palp (A ventral view; B retrolateral view); C left male chelicera, posterior view; D left female chelicera, posterior view; E–G epigyne (E ventral view; F posterior view; G vulva, dorsal view). H–J Stertinius kumadai Logunov, Ikeda & Ono, 1997. H left male chelicera, posterior view; I–J left male palp (I ventral view; J retrolateral view). Scale bars = 0.1 mm.