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The wolf spider genus Halocosa Azarkina & Trilikauskas, 2019 from China is reviewed, including two species: H.cereipes (L. Koch, 1878) (♂♀) and H.hatanensis (Urita, Tang & Song, 1993) (♂♀). Both species are restricted to northern China, with H.cereipes recorded from China for the first time. Halocosajartica (Urita, Tang & Song, 1993), syn. nov. is synonymized with H.hatanensis (Urita, Tang & Song, 1993). Detailed species descriptions, along with morphological photos, genitalia illustrations, SEM photos of the bulbs and photos of live specimens are also presented.

The genus Isonychia Eaton, 1871 is widely distributed across the Holarctic and Oriental regions. However, no representatives of this genus have been reported from southwestern China, a region known for its high biodiversity. Here, we described and illustrated Isonychialatias sp. nov., a new species recently collected from Guizhou Province, southwestern China, across all developmental stages. The imagos of this new species exhibit some uncommon characters within Isonychia, such as brown mid- and hindlegs, and pale stripes on the thorax. To explore the phylogenetic status of this new species within Isonychia, a multigene phylogenetic analysis was conducted.

Four new species of leptonetid spiders from Anhui Province, China are recognized: Jingnetaqishan Tong, sp. nov. (♂♀), Jingnetawukuishan Tong, sp. nov. (♂), Leptonetelajingde Tong, sp. nov. (♂♀) and Rhyssoleptonetalishan Tong, sp. nov. (♂♀). An identification key to leptonetid spiders from Anhui is provided.

Four, presumably microendemic new Leuctra species are described on the basis of morphology of the adult males and females. Each species was collected only in a single mountain range of the western Balkans: Leuctraenigma Kovács & Murányi, sp. nov. (Albania, Çermenikë), L.golija sp. nov. (Serbia, Golija), L.puskasi sp. nov. (Bosnia & Herzegovina, Kozara), L.visitor sp. nov. (Montenegro, Visitor). Their morphological affinities and ecology are discussed, phylogenetic relations will be described in the framework of ongoing molecular studies of Balkan Leuctra species. The occurrences of the new species are depicted on a map. A list of Balkan endemic Leuctra species is given. Leuctradalmoni Vinçon & Murányi, 2007 is new for Albania and Montenegro, Nemourauncinata Despax, 1934, N.marginata Pictet, 1836 and Isoperlaburesi Raušer, 1962 are new for Albania, Nemourasciurus Aubert, 1949 is new for Bosnia & Herzegovina, while Capnias. l.viduarilensis Raušer, 1962 and L.metsovonica Aubert, 1956 are new for Montenegro.

The here-provided description of the new genera Chiquiticus gen. nov. and Nitidocolpus gen. nov. was necessitated by a phylogenetic study of Staphylininae (to be published separately), which will be used for the proper characterization of their respective new suprageneric lineages in an upcoming update of the higher classification of this subfamily. Both new genera are erected for species that had been previously described but misplaced in the highly polyphyletic "taxonomic wastebasket" genera Heterothops (Amblyopinina) and Quedius (Quediina), resulting in the following new combinations: Chiquiticusarizonicus (Smetana, 1971), comb. nov. ex. Heterothops; Chiquiticuscampbelli (Smetana, 1971), comb. nov. ex. Heterothops; †Chiquiticuscornelli (Chatzimanolis & Engel, 2013), comb. nov. ex. Heterothops; Chiquiticusgemellus (Smetana, 1971), comb. nov. ex. Heterothops; †Chiquiticusinfernalis (Chatzimanolis & Engel, 2013), comb. nov. ex. Heterothops; Chiquiticusoccidentis (Casey, 1886), comb. nov. ex. Heterothops; Chiquiticuspusio (LeConte, J. L., 1863), comb. nov. ex. Heterothops; Chiquiticusrambouseki (Blackwelder, 1943), comb. nov. ex. Heterothops; Nitidocolpusaurofasciatus (Bernhauer, 1917), comb. nov. ex. Quedius; Nitidocolpuschampioni (Sharp, 1884), comb. nov. ex. Quedius; Nitidocolpuscolumbinus (Bernhauer, 1917), comb. nov. ex. Quedius; Nitidocolpusgermaini (Bernhauer, 1917), comb. nov. ex. Quedius; Nitidocolpusillatus (Sharp, 1884), comb. nov. ex. Quedius; Nitidocolpuslaeticulus (Sharp, 1884), comb. nov. ex. Quedius; Nitidocolpustriangulum (Fauvel, 1891), comb. nov. ex. Quedius. Additionally, several more Neotropical Quedius species, which resemble Nitidocolpus, have been revised and transferred to the amblyopinine genus Cheilocolpus or the cyrtoquediine genus Cyrtoquedius, with the following new combinations: Cheilocolpusforsteri (Scheerpeltz, 1960), comb. nov. ex. Quedius; Cheilocolpusspeciosus (Bernhauer, 1917), comb. nov. ex. Quedius; Cheilocolpusviridulus (Erichson, 1840), comb. nov. ex. Quedius; Cyrtoquediusviridipennis (Fauvel, 1891), comb. nov. ex. Quedius. The undescribed species diversity of the newly described genera is also highlighted.

A new aphid species, Chaitoregmakirlia sp. nov., from Fujian and Guangdong, China, is described, which feeds on bamboo. The diagnostic morphological characteristics of the new species are described and illustrated. A key to apterous viviparous females of Chaitoregma species is provided. The COI barcode sequence of this new species is also provided. Due to its unique morphological characteristics, the diagnosis of the genus has been revised. Other species within the genus are also reviewed and discussed.

New taxonomic and faunistic data for three species of the genus Sinlathrobium Assing, 2013 from China are provided. Sinlathrobiumassingi Chen & Peng, sp. nov. (Chongqing: West Daba Shan) and Sinlathrobiumchenzhilini Chen & Peng, sp. nov. (Guangxi: Maoer Shan) are described and illustrated. Additional records from Chongqing, detailed bionomic data and female sexual characters of S.lobrathioides (Assing, 2012) are provided. A key to the species of Sinlathrobium is given.

Mecistocephalus Newport, 1843 is the most diverse genus in the family Mecistocephalidae; however, only two species have been recorded in mainland China to date. Therefore, taxonomic research on Chinese Mecistocephalus needs further research. In this study, the species diversity of Mecistocephalus in southern China was investigated using the mitochondrial marker COI integrated with morphological evidence. Species delimitation using Automatic Barcode Gap Discovery, Poisson Tree Processes, and phylogenetic and morphological analyses revealed ten species, including two newly described species, M.chuensis Jiang & You, sp. nov. and M.huangi Jiang & You, sp. nov. Furthermore, based on newly collected specimens, the presence of the little-known species M.smithii Pocock, 1895 was confirmed in China and thoroughly re-described.

The subfamily Eupoinae Maddison, 2015 is an enigmatic group of minute leaf-litter-dwelling jumping spiders from Southeast Asia. Although previous molecular phylogenetic studies have suggested that it is one of the basal (non-salticine) lineages within jumping spiders, its exact placement remains unclear. In this study, ultra-conserved element data were collected from major salticid lineages to investigate the phylogenetic relationships of all salticid subfamilies, with a special focus on the placement of Eupoinae. The results provide a well-supported phylogeny for jumping spider subfamilies, and suggest a sister relationship of Eupoinae with Spartaeinae Wanless, 1984, a basal lineage of jumping spiders with relatively high species diversity and morphological and behavioural diversity. With the placement of Eupoinae, we have resolved the relationships of all salticid subfamilies, supplying a robust framework for evolutionary studies of jumping spiders.

This study presents a description of a new stick insect species belonging to the genus Trychopeplus Shelford, 1909, discovered by the authors in the Chocó ecoregion of northwestern Ecuador. Trychopeplusmashpiensis sp. nov. is described and illustrated based on males, females, and eggs. The distinctive features of this new species, such as its unique body ornamentation and the morphology of its egg structure without fringes, clearly differentiate it from other known species within the genus. Photographs of the new species are provided, along with an updated key and distribution map for all Trychopeplus species. These findings enhance our understanding of the genus's diversity.