Two new Eresus species (Araneae, Eresidae) from Xinjiang, China Author Lin, Yejie https://orcid.org/0000-0002-6789-2731 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang, China linyejie15@gmail.com Author Li, Shuqiang https://orcid.org/0000-0002-3290-5416 Institute of Zoology, Chinese Academy of Sciences, Beijing, China Author Zhao, Xin CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China Author Chen, Zhanqi CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China Author Chen, Haifeng https://orcid.org/0000-0001-5838-3700 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang, China chenhaifeng@lfnu.edu.cn text Biodiversity Data Journal 2022 2022-12-06 10 94853 94853 http://dx.doi.org/10.3897/BDJ.10.e94853 journal article http://dx.doi.org/10.3897/BDJ.10.e94853 1314-2828-10-e94853 BE54E35BFDB545508FEFA3FC5702EEC4 D32D9106D4475E459D819B00DB23BE18 Eresus yukuni Lin & Li sp. n. Materials Type status: Holotype . Occurrence: recordedBy: Kun Yu ; individualID: IZCAS-Ar43546; occurrenceID: F2E880E4-6CA6-5E5A-929E-63D1B3CE4703 ; Taxon: taxonID: urn:lsid:zoobank.org:act: 95651052-1B7C-47FE-8E6E-1D6D20E51B0A ; scientificName: Eresus yukuni Lin & Li , sp. n.; kingdom: Animalia; phylum: Arthropoda; class: Arachnida; order: Araneae; family: Eresidae; genus: Eresus; Location: country: China ; stateProvince: Xinjiang Uygur Autonomous Region ; municipality: Urumqi City; locality: Saybag District , near Shihuoshan Tunnel ; decimalLatitude: 43.7947 ; decimalLongitude: 87.4783 ; Identification: identifiedBy: Kun Yu ; Event: year: 2019; month: 6; day: 24 Description Male (Holotype, IZCAS-Ar43546): Habitus as in Figs. 2C and D. Total length: 6.48, carapace 3.35 long, 2.44 wide, 1.76 high. Abdomen 3.20 long, 2.88 wide. Carapace black with white setae; pars cephalica elevated. Eye sizes and interdistances: AME 0.09, ALE 0.13, PME 0.18, PLE 0.08, AME-AME 0.12, AME-ALE 0.78, PME-PME 0.19, PME-PLE 1.03, AME-PME 0.04, ALE-PLE 1.88. Pars cephalica with a pointed posterior margin dorsally, almost as long as wide (2.54 long, 2.83 wide). Chelicerae covered with black and few white setae. Leg I with a white ring of setae at joints, black; leg II-IV with white setae dorsally. Leg measurements: Leg I 6.54 (1.95+2.15+1.32+1.12); leg II 5.11 (1.51+1.67+1.00+0.93); leg III 4.55 (1.47+1.50+0.81+0.77); leg IV 6.12 (1.93+2.22+1.14+0.83). Abdomen dark brown, with four black spots, covered with dense white setae dorsally; ventrum with black setae, sigilla conspicuous, surrounded by black setae. Palp (Fig. 5 ). Tegulum round. Conductor height is greater than width, with a slight shoulder and curved terminal tooth; the height of the lamella is almost twice the length of terminal tooth; groove deep and narrow. Female. Unknown. Diagnosis Male of Eresus yukuni sp. n. is similar to the E. lavrosiae Mcheidze, 1997 by having black carapace covered with short black and white setae that is almost as wide at the pars cephalica as it is at the pars thoracica (Fig. 2 A and B; Zamani et al. 2020 , fig. 15). However, this species can be distinguished from E. lavrosiae by the abdomen with dense white setae dorsally (Fig. 2 A) [vs. with a frontally abrupt white circle in E. lavrosiae ( Zamani et al. 2020 , fig. 15)]. The palps are similar to those of E. lavrosiae by the strongly curved terminal tooth and the conspicuously deep lamellar groove, but can be distinguished by the shoulder near the base of the embolus in retrolateral view (Fig. 5 B) (vs. shoulder far from the base of the embolus in E. lavrosiae ( Zamani et al. 2020 , fig. 19) and the conductor higher than wide in ventral view (Fig. 5 C) [vs. wider than high in E. lavrosiae ( Zamani et al. 2020 , fig. 18)]. Etymology The species is named after Mr. Kun Yu, who collected the holotype; noun (name) in the genitive case. Distribution Known only from the type locality (Xinjiang, China).