Four new species of the genus Yunguirius (Araneae, Agelenidae) from ChinaAuthorWei, Mian0000-0001-7348-8885Hubeiate Key Laboratory of Regional Development and Environmental Response, Faculty of Re-sources and Environmental Science, Hubei University, Wuhan 430062, ChinaAuthorLiu, JieHubeiate Key Laboratory of Regional Development and Environmental Response, Faculty of Re-sources and Environmental Science, Hubei University, Wuhan 430062, China & The State Key Laboratory of Biocatalysis and Enzyme Engineering of China, School of Life Sciences, Hubei University, Wuhan 430062, Hubei, ChinaAuthorWang, Kai0000-0002-9877-5140Hubeiate Key Laboratory of Regional Development and Environmental Response, Faculty of Re-sources and Environmental Science, Hubei University, Wuhan 430062, ChinatextZooKeys20242024-09-021211115journal article30205910.3897/zookeys.1211.1264877ab3b2e3-a324-4323-a1d3-1187e8639cc816DBAD49-A3D7-40F4-A1A1-FB221AB008BDYunguirius trigonus
Wei & Liu
sp. nov.Figs 4
,
5
,
10Type material.Holotype♀
(
HBU-WM-24-003
):
China
:
Chongqing City
,
Nanchuan District
,
Jinfo Mountain
,
29.0489 ° N
,
107.1279 ° E
, elevation:
681 m
,
30. IX. 2021
,
T. X. Gu
leg.
Etymology.The specific epithet is derived from the Greek word “ trigon ”, meaning triangular and referring to the atrium and the posterior epigynal sclerite of the new species forming into a subtriangular pattern; an adjective.Diagnosis.
The females of
Yunguirius trigonussp. nov.
resemble those of
Y. subterebratus
and
Y. wangqiqiaesp. nov.
in having a trapezoidal atrium, with the width longer than the length and the width at the widest point being three times longer than the narrowest point (Figs
4 A
,
6 A
; fig. 245 A in
Zhu et al. 2017
), compared to being trapezoidal but with the width being shorter than the length, and the width of the widest point approximately being twice that of the narrowest point in
Y. ornatus
(Fig.
3 A
in
Li et al. 2023
), and being heart-shaped, pentagonal or subrounded in other
Yunguirius
species
(Figs
1 A
,
2 A
,
8 A
; figs 2 A, 4 A in
Li et al. 2023
). However,
Y. trigonussp. nov.
can be distinguished from the latter by the following characteristics: 1) the presence of a pair of long and linear hoods (Fig.
4 A
), versus having a pair of triangular hoods in the latter (Fig.
6 A
; fig. 245 A in
Zhu et al. 2017
); 2) the short and slightly overlapping blind sacs of the copulatory ducts (Fig.
4 B
), versus being long and obviously overlapped in the latter (Fig.
6 B
; fig. 245 B in
Zhu et al. 2017
); 3) the spermathecal stalks are relatively short and thick (Fig.
4 B
), versus being reduced in
Y. subterebratus
(fig. 245 B in
Zhu et al. 2017
) or being subequal to half the width of the atrium in
Y. wangqiqiae
Wei & Liu
,
sp. nov.
(Fig.
6 B
).
Epigyne of
Yunguirius trigonussp. nov.A
epigyne, ventral view
B
vulva, dorsal view. Scale bars: 1.00 mm. Abbreviations: A = atrium; BS = blind sac; CD = copulatory duct; CO = copulatory opening; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; SB = spermathecal base; SH = spermathecal head; SS = spermathecal stalk. The white dashed line B indicates the spermathecal head, the white outline B indicates the fertilization duct. Scale bar: 0.50 mm.
Description.Female
(
holotype
) (Fig.
5
). Carapace reddish brown. Cervical and radial groove distinct. Cephalic region wide, moderately raised and wide, lateral margin with indistinct furrows. Chelicerae with 3 promarginal teeth and 2 retromarginal teeth, condyle red. Sternum longer than wide. Abdomen pale yellow, covered by hairs. Legs red. Total length 12.31. Carapace 5.83 long, 3.99 wide, cephalic region 3.49 wide. Abdomen 6.48 long, 3.68 wide. Eye size and interdistance:
AME
0.18,
ALE
0.27,
PME
0.22,
PLE
0.25;
AME – AME
0.10,
AME – ALE
0.17,
AME – PME
0.16,
ALE – PLE
0.10,
PME – PME
0.11,
PME
–
PLE
0.42. Leg measurements: Leg I 16.00 (2.12, 0.81, 3.97, 1.71, 3.39, 2.86, 1.57), leg II 14.71 (1.82, 0.82, 3.61, 1.66, 2.68, 2.74, 1.65), leg III 12.33 (1.55, 0.80, 2.99, 1.41, 1.94, 2.35, 1.45), leg IV 16.90 (1.87, 0.93, 4.13, 1.82, 3.41, 3.33, 1.61). Epigyne (Fig.
4
). Epigynal teeth absent. Atrium centrally situated, trapezoidal, anterior margin incomplete, posterior margin short. Epigynal sclerite longer than wide. Hoods long, vertically oriented, situated laterally. Fold absent. Copulatory ducts broad, laterally originated, blind sacs short, distal tips slightly overlapped. Spermathecal bases normal, spermathecal stalks extended laterally, with distal tips conch-shaped, spermathecal heads reduced and membranous, distal tips visible. Fertilization ducts posteriorly situated.
Characters of the female of
Yunguirius trigonussp. nov.A
habitus, dorsal view
B
habitus, prolateral view
C
eye area, frontal view
D
eye area, dorsal view
E
cephalic rigion, lateral view. Scale bars: 2.00 mm (
A, B
); 0.50 mm (
C, D
); 0.25 mm (
E
).