Yunguirius gen. nov., a new genus of Coelotinae (Araneae, Agelenidae) spiders from southwest China Author Li, Bing https://orcid.org/0000-0002-7106-4680 College of Life Sciences, Langfang Normal University, Langfang, Hebei 065000, China Author Zhao, Zhe https://orcid.org/0000-0002-0781-0204 Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China zhaozhe@ioz.ac.cn Author Okumura, Ken-ichi Department of Zoology, National Museum of Nature and Science, 4 - 1 - 1 Amakubo, Tsukuba, Ibaraki 305 - 0005, Japan Author Meng, Kaibayier Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China Author Li, Shuqiang https://orcid.org/0000-0002-3290-5416 Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China Author Chen, Haifeng https://orcid.org/0000-0001-5838-3700 College of Life Sciences, Langfang Normal University, Langfang, Hebei 065000, China chenhaifeng@lfnu.edu.cn text ZooKeys 2023 2023-04-25 1159 51 67 http://dx.doi.org/10.3897/zookeys.1159.100786 journal article http://dx.doi.org/10.3897/zookeys.1159.100786 1313-2970-1159-51 C2BD6C63A9D24C3E81893F9E3001AC64 50B1E98B0A3D5A3CAA77A799341023E9 Genus Yunguirius B. Li, Zhao & S. Li gen. nov. Type species. Coelotes ornatus Wang, Yin, Peng & Xie, 1990, from Kunming, Yunnan, China (designated herein). Etymology. The generic name is derived from the pinyin word "Yungui" , referring to Yunnan-Guizhou Plateau where the genus is distributed, and "- rius " refers to the genus as part of its sister groups of genera: Nuconarius , Hengconarius , and Sinodraconarius . The gender is masculine. Diagnosis. Morphological characteristics of Yunguirius gen. nov. resemble those of Nuconarius , Hengconarius , and Sinodraconarius , which are distributed in southeastern China, by cymbial furrow short, with a length less than half of cymbium (fig. 3 in Zhang 1993 ; fig. 31 in Peng and Wang 1997 ), embolus thick, conductor with two branches (figs 1-3 in Zhang 1993 ; figs 30, 31 in Peng and Wang 1997 ), and epigyne with posterior sclerite, epigynal teeth absent, atrium with sclerotic margin (Figs 2A , 3A , 4A ). However, it can be distinguished from these genera by habitus, and detailed structures of male palp and epigyne as follows: 1) carapace tonneau-shaped, first half wide, and abdomen beloid (Figs 2C , 3C , 4C ); 2) male palp with bifurcate conductor, the upper branch large and wide with groove, while the lower one is more elongated (fig. 2 in Zhang 1993 ; fig. 252D in Zhu et al. 2017 ); 3) epigynal atrium very large, in the centre of epigyne and occupying c. 1/2 the size of epigyne (Figs 2A , 3A , 4A ); 4) epigyne dark and sclerotic, with lateral folds that are located between the lateral margin of the atriumand the epigynal hood (Figs 2A , 3A , 4A ); 5) copulatory duct and spermathecal head concomitant, along the contour of the atrium (Figs 2B , 3B , 4B ); and 6) spermatheca located posteriorly, spermathecal head very long and continuous with the copulatory duct (Figs 2B , 3B , 4B ). Figure 2. Epigyne and female habitus of Yunguirius duoge sp. nov. A epigyne, ventral B vulva, dorsal C female habitus, dorsal D same, ventral E same, lateral. Scale bar equal for C-E . Abbreviations: A = atrium; CD = copulatory duct; CO = copulatory opening; F = fold; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SB = spermathecal base; SH = spermathecal head; St = stalk. Figure 3. Epigyne and female habitus of Yunguirius ornatus comb. nov. A epigyne, ventral B vulva, dorsal C female habitus, dorsal D same, ventral E same, lateral. Scale bar equal for C-E . Abbreviations: A = atrium; CD = copulatory duct; CO = copulatory opening; F = fold; FD = fertilization duct; H = hood; MS = median septum; PES = posterior epigynal sclerite; S = spermatheca; SB = spermathecal base; SH = spermathecal head; St = stalk. Figure 4. Epigyne and female habitus of Yunguirius xiangding sp. nov. A epigyne, ventral B vulva, dorsal C female habitus, dorsal D same, ventral E same, lateral. Scale bar equal for C-E . Abbreviations: A = atrium; CD = copulatory duct; CO = copulatory opening; F = fold; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SB = spermathecal base; SH = spermathecal head; St = stalk. Figure 5. Distribution records of species of Yunguirius gen. nov. in China 1 Y. duoge sp. nov. 2 Y. ornatus 3 Y. subterebratus 4 Y. terebratus 5 Y. xiangding sp. nov. Description. Small to very large spiders, body length 6.00 to 21.80. Carapace brown to black, tonneau-shaped, longer than or as long as abdomen, with longitudinal fovea and dark radial grooves; chelicerae black, with three promarginal and two retromarginal teeth; endites and labium brown to dark brown, anterior white with black hairs; sternum brownish to brown, longer than wide. Abdomen yellowish-brown, nearly oval, posterior widest, with four to six darker chevrons or speckles, or without any pattern. Leg formula 4> 1> 2> 3 or 1> 4> 2> 3. Male palp: patellar apophysis finger-shaped, retrolateral tibial apophysis large, lateral tibial apophysis small, median apophysis spoon-shaped; conductor large, with two branches; embolus thick, beginning at a 7 o'clock position, embolic base swollen; cymbial furrow short, with the length less than half of cymbium. Epigyne: posterior epigynal sclerite varying in shape; atrium very large, wide to narrow, with osteosclerotic lateral margin, inside white osteon, outside with brownish or brown markings and brown or darker folds; copulatory duct membranous, arising posteriorly, extending to anterior, opening anteriorly; spermatheca brown, spermathecal base swollen, spermathecal head long and line-shaped, extending anteriorly, opposite end swollen, lamellar or connected with a stalk. Distribution. Guizhou, Hunan, Sichuan and Yunnan, China (Fig. 5 ).