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The genus Khorata Huber, 2005 contains 51 species. It is distributed in the Indo-Malayan Region. Nine species have been recorded from Vietnam.Khorata ninhbinh sp. nov. is described as a new species from Vietnam. In addition, a list of all Khorata species from Vietnam is also provided.

Only two Otacilia Thorell, 1897 species with troglobitic characteristics have been recorded from Laos and no records of troglobitic Otacilia species from China.A new troglobitic species is reported from Guangxi, China: Otacilia khezu Lin & Li, sp. nov. (♂♀). Photos and morphological descriptions of the new species are presented; the type specimens of the new species are deposited in the Institute of Zoology, Chinese Academy of Sciences (IZCAS), Beijing.

The genus Wuliphantes Irfan, Wang & Zhang, 2023 is a small genus in the family Linyphiidae Blackwall, 1859, with only three species: W. guanshan (Irfan, Wang & Zhang, 2022), W. tongluensis (Chen & Song, 1988) and W. trigyrus Irfan, Wang & Zhang, 2023, all distributed in China.A new species: Wuliphantes yaan sp. nov. from Sichuan Province, China is reported. In addition, we re-described the type specimens of W. tongluensis (Chen & Song, 1988) that is similar to W. yaan sp. nov.

The spider genus Liphistius Schiødte, 1849 contains 69 species, endemic to Indochina and Southeast Asia. Only one species is currently known from the Chinese province of Yunnan: Liphistius nabang Yu, Zhang & Zhang, 2021.A new species, Liphistius liz Lin & Li, sp. nov., is described from Yunnan, China, on the basis of both sexes. Photos and a morphological description of the new species are provided.

Vappolotes Zhao & Li, 2019 is one of the troglophilous genera, with five known species. The previous description of V. tianjiayu from China was based solely on female specimens collected from caves in the Wuling Mountains in southern China without any males.The present study, deals with the first record of the male of V. tianjiayu from its type locality: Guluo Cave. The validation of species is based on the morphological characteristics of both male and female.

The theridiid spider genus Stemmops O. Pickard-Cambridge, 1894 includes 27 extant species and is distributed in America (23 spp.) and Asia (4 spp.). Three species, S. forcipus Zhu, 1998 (♂♀), S. nigrabdomenus Zhu, 1998 (♂) and S. nipponicus Yaginuma, 1969 (♂♀), are currently known from China.Two new species of Stemmops are described from China: S. atratus sp. n. (♀, Jiangsu, Zhejiang) and S. lini sp. n. (♂♀, Fujian, Zhejiang). In addition, the previously unknown female of S. nigrabdomenus Zhu, 1998 is described. Photos and morphological descriptions are provided.

The spider genus Stiphropus Gerstaecker, 1873 currently includes 21 extant species that are distributed in Africa (12) and Asia (9). Four species, S. falciformus Yang, Zhu & Song, 2006, S. myrmecophilus Huang & Lin, 2020, S. ocellatus Thorell, 1887 and S. soureni Sen, 1964, are currently known from China.The mismatched female of S. falciformus is reported as a new species: S. qianlei sp. n. (♂♀). The unknown male of S. soureni Sen, 1964 is described for the first time. Photos and morphological descriptions are provided.

The spider genus Asceua Thorell, 1887 contains 34 species, almost entirely limited to Indochina, India, Sri Lanka and China, with a regional distribution. Eleven species of Asceua are currently only known from China, five of them are described only from one sex.Two new spider species of the genus Asceua are reported from China, A. haocongi sp. n. (♂♀, Hainan) and A. zijin sp. n. (♂♀, Jiangsu). Photos and a morphological description of the new species are provided.

The spider family Ctenidae Keyserling, 1877 has a worldwide distribution with 584 species belonging to 49 genera. Amongst these, 141 species are from Asia, including 130 species assigned to Cteninae Keyserling, 1877.Nine new species belonging to three genera of Cteninae are reported from Asia: Amauropelma krabi sp. n. (female; Krabi, Thailand), Am. phangnga sp. n. (male; Phang Nga, Thailand), Am. saraburi sp. n. (male and female; Saraburi, Thailand); Anahita medog sp. n. (male and female; Tibet, China); Bowie ninhbinh sp. n. (male; Ninh Binh, Vietnam) and B. vinhphuc sp. n. (male and female; Vinh Phuc, Vietnam) from the robustus-species group; B. borneo sp. n. (male; Sabah, Malaysia) from the chinagirl-species group; B. engkilili sp. n. (female; Engkilili, Malaysia); B. sabah sp. n. (male and female; Sabah, Malaysia) from the scarymonsters-species group. The male of An. popa Jäger & Minn, 2015 and the female of B. fascination Jäger, 2022 (robustus-species group) are described for the first time. B. fascination Jäger, 2022 is reported from China for the first time. In addition, the DNA barcodes of all the species in this study were obtained, except for B. vinhphuc sp. n.

The theraphosid spider genus Chilobrachys Karsch, 1892 contains 30 species, almost entirely limited to Indochina, India, Sri Lanka and China. Six species of Chilobrachys are currently known from China: C. dominus Lin & Li, 2022 (Yunnan), C. guangxiensis (Yin & Tan, 2000) (Guangxi, Hainan), C. hubei Song & Zhao, 1988 (Hubei, Chongqing), C. jinchengi Lin & Li, 2022 (Tibet), C. liboensis Zhu & Zhang, 2008 (Guizhou, Guangxi) and C. lubricus Yu et al., 2021 (Yunnan).A new species, Chilobrachys qishuoi Lin & Li, sp. n., is described from Guangdong, China, on the basis of both sexes. This is the easternmost Chilobrachys species known. Photos and a morphological description of the new species are provided. Type materials are deposited in the Institute of Zoology, Chinese Academy of Sciences (IZCAS) in Beijing, China.

The spider family Ctenidae Keyserling, 1877 has a worldwide distribution with 580 species belonging to 49 genera, of which 109 species of six genera are distributed in Southeast Asia.Four new species of ctenid spiders are described from Southeast Asia: Anahita menglun sp. n. (Yunnan, China), Bowie haiphong sp. n. (Hai Phong, Vietnam), Bowie mengla sp. n. (Yunnan, China) and Bowie zhengi sp. n. (Yunnan, China). In addition, the female of Sinoctenus zhui Marusik, Zhang & Omelko, 2012 (Hainan, China) is described for the first time.

The genus Ibana Benjamin, 2014 was established, based on the type species Ibana senagang Benjamin, 2014 from Borneo, Malaysia. No species of this genus has been recorded from China.A new species of Ibana is described and illustrated, representing the first record of the genus for China. Ibana gan sp. n. differs from its congener by the yellowishbrown longitudinal band on the abdomen and the round, contiguous spermathecae. The distribution of the new species in Jiangxi Province is mapped.

Amauropelma Raven, Stumkat & Gray, 2001 currently contains 24 species. It is distributed in Australia, India, Indonesia, Laos and Malaysia. This genus has not been found in China. Ctenus Walckenaer, 1805 comprises 213 known species. This genus is distributed worldwide. Currently, only two species, Ctenus lishuqiang Jäger, 2012 and Ctenus yaeyamensis Yoshida, 1998 are known to occur in China.Three new species of ctenid spiders are described from Xishuangbanna Tropical Botanical Garden in Yunnan Province, China: Amauropelma yunnan sp. nov., Ctenus banna sp. nov. and Ctenus yulin sp. nov. Amauropelma and Ctenus robustus Thorell, 1897 are reported from China for the first time.

Troglomorphism is rare known in Mygalomorphae. Only three troglomorphic mygalomorphs have been recorded in China: Raveniola beelzebub Lin & Li, 2020, R. lamia Yu & Zhang, 2021 and Sinopesa gollum Lin & Li, 2021.A new troglobiontic species of the genus Raveniola is described from China: R. yangren sp. n. (female) from Hunan. Photos and morphological description of the new species are given.This new species has elongated appendages and degenerated eyes in order to adapt to the cave environment. It can be distinguished by the stubby, unbranched spermathecae from other Raveniola.

Haplocosmia Schmidt & von Wirth, 1996 is a small genus distributed in the Himalayas that includes two species. This genus has not been found in China (Li et al. 2021, Yao et al. 2021, Zhao et al. 2022).A new species of the genus Haplocosmia is described from China: Haplocosmia sherwoodae sp. n. from Tibet. Photos and a morphological description of the new species are given. The type specimen of the new species is deposited in the Institute of Zoology, Chinese Academy of Sciences in Beijing (IZCAS).

The genus Cyclocosmia Ausserer, 1871 of the spider family Halonoproctidae Pocock, 1901 includes ten known species from North America and Asia. Since Cyclocosmia ricketti was described by Pocock in 1901, no males of this species have ever been reported.The male of Cyclocosmia ricketti is described for the first time, based on a specimen collected near the type locality in Fujian Province, China. A morphological description and illustrations are given.

The genus Ischnothyreus Simon, 1893 is one of the most speciose genera of Oonopidae, with 114 extant species mainly distributed in the Old world. Currently, 16 species have been recorded in China.Two species of the genus Ischnothyreus Simon, 1893 from China are recognized, including one new species, I. yunlong Tong & Li, sp. n. (male, female) from Yunnan. Ischnothyreus yueluensis Yin & Wang, 1984 is re-studied. Descriptions, diagnoses, and photos of the two species are provided.

Yongxing Island (about 1.85 km2) is the largest island of the Xisha Islands. It is located in the Western South China Sea, and belongs to the tropical ocean monsoon climate zone. Yongxing island is quite rich in biological resources, for example, plants and birds have been well documented. However, there are limited reports on spider resources in Yongxing Island.A preliminary checklist of spiders of the Yongxing Island is provided here based on a short term study undertaken in January 2008. A total of 23 species belonging to 21 genera and 11 families were recorded from the area, which forms baseline information of spiders of the Yongxing Island. Among these, Onopidae, Pholcidae, Araneidae and Salticidae were found to be dominant in the area. Brignolia parumpunctata (Simon, 1893), Opopaea apicalis (Simon, 1893), Opopaea deserticola Simon, 1891 and Xyphinus baehrae Kranz-Baltensperger, 2014 were first reported from China during the study, for which we provide taxonomic description in this paper.

Eresidae C. L. Koch, 1845 contains nine genera and 102 species, of which 24 species belong to Eresus Walckenaer, 1805. Four species of the family are known from China: E. granosus Simon, 1895 (Beijing), E. kollari Rossi, 1846 (Hebei), E. lishizheni Lin, Marusik & Li, 2021 (Xinjiang) and Stegodyphus tibialis (O. Pickard-Cambridge, 1869) (Yunnan).Two new species of Eresus are described from Xinjiang, China: Eresus da Lin & Li sp. n. and E. yukuni Lin & Li sp. n. Photos and morphological descriptions of new species are given.