Yunguirius trigonus Wei & Liu, 2024

Wei, Mian, Liu, Jie & Wang, Kai, 2024, Four new species of the genus Yunguirius (Araneae, Agelenidae) from China, ZooKeys 1211, pp. 1-15 : 1-15

publication ID

https://doi.org/ 10.3897/zookeys.1211.126487

publication LSID

lsid:zoobank.org:pub:16DBAD49-A3D7-40F4-A1A1-FB221AB008BD

DOI

https://doi.org/10.5281/zenodo.13629966

persistent identifier

https://treatment.plazi.org/id/8854F835-A7BA-448B-B3B2-B0921CB9E1A6

taxon LSID

lsid:zoobank.org:act:8854F835-A7BA-448B-B3B2-B0921CB9E1A6

treatment provided by

ZooKeys by Pensoft

scientific name

Yunguirius trigonus Wei & Liu
status

sp. nov.

Yunguirius trigonus Wei & Liu sp. nov.

Figs 4 View Figure 4 , 5 View Figure 5 , 10 View Figure 10

Type 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. GoogleMaps

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 trigonus sp. nov. resemble those of Y. subterebratus and Y. wangqiqiae sp. 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 View Figure 4 , 6 A View Figure 6 ; 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 View Figure 3 in Li et al. 2023), and being heart-shaped, pentagonal or subrounded in other Yunguirius species (Figs 1 A View Figure 1 , 2 A View Figure 2 , 8 A View Figure 8 ; figs 2 A, 4 A in Li et al. 2023). However, Y. trigonus sp. 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 View Figure 4 ), versus having a pair of triangular hoods in the latter (Fig. 6 A View Figure 6 ; fig. 245 A in Zhu et al. 2017); 2) the short and slightly overlapping blind sacs of the copulatory ducts (Fig. 4 B View Figure 4 ), versus being long and obviously overlapped in the latter (Fig. 6 B View Figure 6 ; fig. 245 B in Zhu et al. 2017); 3) the spermathecal stalks are relatively short and thick (Fig. 4 B View Figure 4 ), 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 View Figure 6 ).

Description.

Female (holotype) (Fig. 5 View Figure 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 View Figure 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.

Male. Unknown.

Distribution.

China (Chongqing).

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Agelenidae

Genus

Yunguirius