Amaurobius yaan Lin & Li, 2024

Lu, Ying, Lin, Yejie & Li, Shuqiang, 2024, Two new species of Amaurobius C. L. Koch, 1837 (Araneae, Amaurobiidae) from Sichuan Province, China, Zootaxa 5397 (1), pp. 116-126 : 121-125

publication ID	https://doi.org/ 10.11646/zootaxa.5397.1.6
publication LSID	lsid:zoobank.org:pub:BA26DCC9-AC6D-426C-BD75-877BEA3FF74E
DOI	https://doi.org/10.5281/zenodo.10468466
persistent identifier	https://treatment.plazi.org/id/03CA879D-FFF2-E937-FF05-3C3BFCCEF844
treatment provided by	Plazi
scientific name	Amaurobius yaan Lin & Li
status	sp. nov.

Treatment

Amaurobius yaan Lin & Li , sp. nov.

Figs 4 View FIGURE 4 , 5 View FIGURE 5 , 6 View FIGURE 6 , 7B View FIGURE 7 , 8E–H View FIGURE 8 , 9 View FIGURE 9

Type material. Holotype: ♁ (IZCAS-Ar44741), China, Sichuan, Ya'an , Baoxing County, Qiaoqi Vill., (30.37°N, 102.82°E), 3 VII 2004, Xiang Xu leg. GoogleMaps Paratype: 1♀ (IZCAS-Ar44742), China, Sichuan, Aba, Wenchuan Co., Wolong Town , Wolongguan Village , (31.0087°N, 103.1598°E, 2032 m) 17 XI 2014, Shuqiang Li leg. GoogleMaps

Etymology. The specific name refers to the type locality and is a noun in apposition.

Diagnosis. Amaurobius yaan sp. nov. resembles A. fenestralis (Ström, 1768) (cf. Figs 4 View FIGURE 4 , 5 View FIGURE 5 , 6 View FIGURE 6 , 7B View FIGURE 7 , 8E–H View FIGURE 8 and Zhang et al. 2008: 503, figs 1–5) in that the males have similar conductor, embolus and median apophysis ( Figs 4A, B View FIGURE 4 , 5A View FIGURE 5 ), and the females have similar spermathecae ( Fig. 6B View FIGURE 6 ). However, this new species can be distinguished by the male retrolateral tibial apophysis triangular ( Figs 4B View FIGURE 4 , 5A, B View FIGURE 5 ; vs. retrolateral tibial apophysis digitiform in ventral view), and the dorsal process of dorsal tibial apophysis longer than mesal process ( Figs 4A, B View FIGURE 4 , 5B View FIGURE 5 ; vs. mesal process almost 3 times dorsal process); females can be separated by the median lobe excavated medially on anterior margins, as wide as long ( Fig. 6A View FIGURE 6 ; vs. anterior margin of median lobe slightly recurved, wider than long), and the lateral lobes large ( Fig. 6A View FIGURE 6 ; vs. lateral lobes small), and the epigynal plate without epigynal hood ( Fig. 6A View FIGURE 6 ; vs. epigynal hood present).

Description. Male (holotype; Fig. 8E, F View FIGURE 8 ): Total length 8.6, carapace 4.5 long, 3.2 wide; abdomen 4.1 long, 3.2 wide. Eye sizes and interdistances: AME 0.12, ALE 0.16, PME 0.11, PLE 0.15; AME–AME 0.16, AME–ALE 0.33, PME–PME 0.29, PME–PLE 0.46, AME–PME 0.22, ALE–PLE 0.12. Leg measurements: I: 11.0 (3.0, 3.7, 2.7, 1.6); II: 10.4 (3.0, 3.5, 2.4, 1.5); III: 9.2 (2.7, 3.3, 2.2, 1.0); IV: 11.4 (3.2, 4.1, 2.8, 1.3).

Colouration (in alcohol). Carapace yellowish brown without flecks, sternum yellowish, chelicerae dark brown, maxillae and labium brown, dorsum of abdomen brown with two pairs of white spots in the anterior part, two pairs of chevrons in the posterior part, and venter brown with white lines in both lateral sides, legs yellowish without ring flecks, spinnerets yellowish.

Chelicera. With 4 promarginal and retromarginal teeth.

Palp ( Figs 4A, B View FIGURE 4 , 5A, B View FIGURE 5 ). Three apophyses present in lateral to dorsal portion of tibia: retrolateral tibial apophysis triangular, dorsal tibial apophysis with two processes: dorsal process triangle shaped, mesal lamellae, almost as long as dorsal process. Bulb almost oval. Conductor membranous, partly fused with tegulum; median apophysis spatulashaped, distinctly excavated on prolateral side; embolus short and conglutinates with the tegulum.

Female (paratype; Fig. 8G, H View FIGURE 8 ): Total length 9.2, carapace 4.0 long, 3.0 wide; abdomen 5.2 long, 4.4 wide. Eye sizes and interdistances: AME 0.13, ALE 0.19, PME 0.13, PLE 0.11; AME–AME 0.12, AME–ALE 0.30, PME–PME 0.32, PME–PLE 0.49, AME–PME 0.19, ALE–PLE 0.15. Leg measurements: I: 8.6 (2.4, 3.1, 1.9, 1.2); II: 7.9 (2.3, 3.0, 1.6, 1.0); III: 6.1 (1.7, 2.4, 1.3, 0.7); IV: 8.4 (2.2, 3.4, 1.9, 0.9).

Colouration (in alcohol). Colour and somatic morphology as in male, except as noted: carapace reddish-brown to black, sternum brown, chelicerae black, maxillae and labium black, legs brown.

Chelicerae. With 3 promarginal and 4 retromarginal teeth.

Epigyne and internal genitalia ( Fig. 6A, B View FIGURE 6 ). Lateral lobes triangular, pointed and distant from each other; median lobe rectangular, excavated medially on anterior margins, as wide as long. Spermathecae elliptical and distant from each other, copulatory ducts tubular, fertilization ducts short and distinct.

Distribution. China (Sichuan, type locality; Fig. 9 View FIGURE 9 ).