Irfan, Muhammad, Zhou, Gu-chun, Bashir, Shahida, Mukhtar, Muhammad Khalid & Peng, Xian-jin, 2020, Yuelushannus gen. nov. (Araneae, Linyphiidae) from China, European Journal of Taxonomy 642, pp. 1-17: 4-9
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Yuelushannus alatus sp. nov.
The species name comes from Latin adjective “ alatus ”, meaning “winged” and refers to the ocular region with wing-like spines in the male.
This new species resembles Yuelushannus barbatus sp. nov. as two-thirds of the male abdomen has a very distinct scutum, the cephalic lobe and pits are distinct, both male and female abdomen with four sigillae. Tibial apophyses densely covered with teeth, paracymbium hook-shaped. Epigyne with column-shaped copulatory ducts. It can be distinguished by:
General: In male, ocular region with wing-like spines which covers most of PMEs in Y. alatus sp. nov. ( Fig. 5View Fig E–G), whereas wing-like spines are absent in Y. barbatus sp. nov. ( Fig. 10View Fig A–B).
Male: Tibial apophyses short, distal end about as long as broad in Y. alatus sp. nov. ( Figs 1 BView Fig, 2 BView Fig), about four times as long as broad in Y. barbatus sp. nov. ( Figs 6 BView Fig, 7 BView Fig). Protegulum short, retained below the distal suprategular apophysis in Y. alatus sp. nov. ( Figs 1 BView Fig, 2 BView Fig), long, extending above the distal suprategular apophysis in Y. barbatus sp. nov. ( Figs 6 BView Fig, 7 BView Fig). The distal suprategular apophysis long, with bifurcated tip, extending above the apex of the cymbium in Y. alatus sp. nov. ( Figs 1View Fig A–B, 2A–B), short, tip not bifurcated, retained below the apex of the cymbium in Y. barbatus sp. nov. ( Figs 6View Fig A–B, 7). Distal end of anterior radical process not frayed in Y. alatus sp. nov. ( Figs 1View Fig A–B, 2), whereas it is frayed in Y. barbatus sp. nov. ( Figs 6View Fig A–B, 7).
CHINA • ♂; Hunan Province, Liuyang City, Mudu Village, Dawei Mountain National Forest Park ; 28.43567° N, 114.03376° E; 14 Jan. 2018; alt. 286 m; Zhou Gu-chun, Wang Lu-yu and Liu Ke-ke leg.; HNU-HNDWS–18–04.GoogleMaps
CHINA • 2 ♂♂, 2 ♀♀; same collection data as for holotype; HNU-HNDWS–18–04-02~05GoogleMaps .
Male (holotype, HNU-HNDWS–18–04)
BODY. Total length 1.85, carapace 0.82 long, 0.71 wide, brown, cephalic lobe with distinct pits, ocular region with thick wing-like spines covering most of PMEs; fovea, cervical and radial grooves distinct; clypeus 0.23 high ( Fig. 5AView Fig, E–G). Sternum wider than long, yellowish with spine-like hairs; labium wider than long; maxillae long, distal end broader, with scopulae ( Fig. 5BView Fig). Chelicerae with six promarginal and five retromarginal teeth. Ocular region narrow, AER straight, PER procurved, PMEs present on cephalic lobe. Eye sizes and interdistances: AME 0.05; ALE 0.09; PME 0.06; PLE 0.07; AME–AME 0.02; PME–PME 0.05; AME–ALE 0.03; PME–PLE 0.05; AME–PME 0.10; ALE–ALE 0.32; PLE–PLE 0.33; ALE–PLE contiguous. Length of legs: I, 2.17 (0.65, 0.76, 0.44, 0.32); II, 1.9 (0.59, 0.67, 0.38, 0.26); III, 1.61 (0.51, 0.52, 0.35, 0.23); IV, 2.21 (0.65, 0.79, 0.46, 0.31). Leg formula IV–I–II–III. TmI 0.18 and TmIV 0.12. Tibial spine formula: 1–1–1–1. Abdomen round, 1.15 long, 0.88 wide, two-thirds of abdomen with distinct brown circle with four sigillae, lateral sides dusky grey, ventral side pale ( Fig. 5View Fig A–B).
PALP ( Figs 1–2View FigView Fig). Patella as long as tibia; tibia with one retrolateral and one dorsal trichobothrium, posterior margin with seven retrolateral spines in a row, dorsally with two tongue-shaped apophyses, densely covered with teeth; paracymbium hook-shaped, distal arm long, with slightly curved tip; tegulum with short transparent protegulum; distal suprategular apophysis sclerotized, with bifurcated tip, extends above apex of cymbium. Embolic division: tail piece long, slightly overlapping suprategulum; embolic membrane transparent, distal end broad; anterior radical process arc-shaped, sclerotized, as long as embolus, distal end slightly frayed; embolus arc-shaped, sclerotized, thick.
Female (allotype, HNDWS–18–04~02)
BODY. Total length 2.04. Carapace 0.86 long, 0.71 wide, yellowish, cephalic region slightly elevated ( Fig. 5AView Fig); fovea, cervical and radial grooves distinct ( Fig. 5AView Fig); clypeus 0.21 high. Sternum wider than long, yellowish, with spine-like hairs; labium wider than long; maxillae long, distal end broader, with scopulae ( Fig. 5BView Fig). Chelicerae with five promarginal and four retromarginal teeth. Ocular region narrow, AER recurved, PER procurved, PER slightly wider. Eye sizes and interdistances: AME 0.05; ALE 0.07; PME 0.06; PLE 0.06; AME–AME 0.02; PME–PME 0.05; AME–ALE 0.03; PME–PLE 0.03; AME– PME 0.07; ALE–ALE 0.27; PLE–PLE 0.31; ALE–PLE 0.01. Length of legs: I, 2.2 (0.67, 0.77, 0.45, 0.31); II, 1.89 (0.59, 0.68, 0.36, 0.26); III, 1.72 (0.51, 0.57, 0.39, 0.25); IV, 2.24 (0.73, 0.77, 0.43, 0.31). Leg formula IV–I–II–III. TmI 0.17 and TmIV 0.12. Tibial spine formula: 1–1–1–1. Abdomen 1.18 long, 0.81 wide, all the other morphological characters similar to those of male ( Fig. 5View Fig A–B).
EPIGYNE ( Figs 3–4View FigView Fig). Ventral plate concave, covered with thick setae; posterior margin of dorsal plate with round scapus; copulatory openings present between dorsal and ventral plate; copulatory ducts long, column-shaped; spermathecae kidney-shaped, pointing towards scapus, separated by a distance of twothirds of their diameter; fertilization ducts small, extending mesally.
Known only from the type locality ( Fig. 11View Fig).
Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet
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