Centromerus alatus, Muhammad & Wang & Zhang, 2023

Muhammad, Irfan, Wang, Lu-Yu & Zhang, Zhi-Sheng, 2023, One new genus and nine new species of Linyphiidae spiders from Yintiaoling Nature Reserve, Chongqing of China, Zootaxa 5257 (1), pp. 82-114 : 89-90

Centromerus alatus sp. n. (DZ+ffiĦ)

Figures 5 , 6

Type material. Holotype male: CHINA: Chongqing, Wuxi County, YNR, Guanshan Forest farm, Modaoxi , 31°31′0.4097″N, 109°44′33.7624″E, elev. 1958 m, 22.IX.2022, L.Y. Wang et al. leg. (SWUC-T-LIN-26-01).

Etymology. This epithet derives from the Latin adjective “ alatus ” meaning “wing” and referring to terminal apophysis bird wing-shaped in male palp.

Diagnosis. Centromerus alatus sp. n. resembles C. sylvaticus ( Blackwall, 1841) in having the similar radix with rod-like radical apophysis ( Fig. 5A ; Gnelitsa 2007, fig. 2c), but can be distinguished by the paracymbium with 18 teeth in C. alatus sp. n. ( Fig. 5B, C ), vs., with 9 teeth in C. sylvaticus ( Gnelitsa 2007, fig. 2a); distal end of cymbium lacking any outgrowth in C. alatus sp. n. ( Fig. 5B, C ), vs., with small outgrowth at the apex in retrolateral view exists in C. sylvaticus ( Gnelitsa 2007, fig. 2a); anterior proximal part of median membrane with 6 teeth in C. alatus sp. n. ( Fig. 5A, D ), vs., with 5 teeth in C. sylvaticus ( Gnelitsa 2007, fig. 2c); terminal apophysis wing-shaped pointing towards the retrolateral margin of cymbium in C. alatus sp. n. ( Fig. 5D ), vs., column-shaped pointing towards the apex of cymbium in C. sylvaticus ( Gnelitsa 2007, fig. 2b).

Description. Male (holotype, Fig. 6A, B ): Total length: 2.91 mm. Carapace 1.48 long, 1.11 wide, brown, cephalic region slightly elevated, fovea, cervical and radial grooves distinct. Clypeus 0.23 high. Chelicerae with 3 promarginal and 5 retromarginal teeth. AER straight, PER slightly procurved. Eye sizes and interdistances: AME 0.06, ALE 0.11, PME 0.09, PLE 0.09, AME–AME 0.04, PME–PME 0.05, AME–ALE, 0.05, PME–PLE 0.0.6, ALE–ALE 0.41, PLE–PLE 0.45, ALE–PLE contiguous. Length of legs: I 4.68 (1.31, 1.59, 1.06, 0.72), II 4.33 (1.27, 1.46, 0.98, 0.62), III 3.69 (1.10, 1.24, 0.82, 0.53), IV 4.95 (1.44, 1.71, 1.14, 0.66). TmI 0.53. Tibial spine formula: 2-2-2-2. Abdomen 1.64 long, 1.05 wide, oval, black.

Palp ( Fig. 5 A−D): Patella half of the length of tibia, dorsally with thick spine; tibia cone-shaped, with two retrolateral and one dorsal trichobothria; cymbium unmodified, with small basal proximal cymbial apophysis; paracymbium U-shaped, with 18 teeth, distal tip with round lobe. Suprategular apophysis long, slightly curved with blunt end. Basal part of radix wider than distal end, slightly curved, with two apophyses RA-I robust, with irregular margins, with about 7 small teeth, RA-II rod-like, with blunt end; median membrane as long as the embolus, anterior proximal part of median membrane with 6 strongly sclerotized teeth; terminal apophysis wing-shaped; embolus elongated with sclerotized embolus proper.

Female. Unknown.

Distribution. Known only from the type locality.

Figures

FIGURE 5. Centromerus alatus sp. nov., male holotype, left palp. A prolateral view B retrolateral view C dorsal view D ventral view.

FIGURE 6. Centromerus alatus sp. nov., male holotype. A habitus, dorsal view B living habitus, dorsal view.