New material of water mites (Acari: Hydrachnidia) from the Uttarakhand State of India is reported. Ten species are identified, among which Sperchon (Hispidosperchon) rostratus Lundblad, 1969 is reported for the first time for India and two species, i.e. Monatractides smiti (Torrenticolidae) and Atractides uttarakhandensis (Hygrobatidae) are described as new to science. One sample collected in standing water in Uttar Pradesh State revealed the presence of three Arrenurus species, of which A. (Truncaturus) indicus Smit & Pešić, 2008 was reported for the first time after the original description.

Typhlodromus (Anthoseius) bagdasarjani Wainstein & Arutunjan and T. (A.) khosrovensis Arutunjan have been frequently recorded from Iran. While investigating the population dynamics of these two predatory mite species on white mulberry in 2022 and 2023, in Tehran (Iran), our study unveiled intriguing morphological abnormalities and variations. Specifically, variations were observed in the number of dorsal shield solenostomes, insertion of ventrianal setae, shape of spermatheca and length of peritreme. In this context, detailed re-descriptions for both species are presented, accompanied by documentation of the observed abnormalities and variations.

Five new Glossilus species of eriophyoid mites from China are described and illustrated. They are Glossilus lanceolatus sp. nov. on Cunninghamia lanceolata (Cupressaceae), Glossilus hodginsus sp. nov. on Chamaecyparis hodginsii (Cupressaceae), Glossilus obtusus sp. nov. on Chamaecyparis obtusa (Cupressaceae), Glossilus procumbenus sp. nov. on Juniperus procumbens (Cupressaceae), and Glossilus funebrus sp. nov. on Cupressus funebris (Cupressaceae). We provided two new combinations—Glossilus convergens (Keifer, 1966), comb. nov. and Glossilus juniperensis (Xue & Yin, 2020), comb. nov. We further provided mitochondrial cox1 gene sequences for five new species. All new eriophyoid mite species are vagrants, causing no apparent symptom to their host plants.

A new genus and two new species of the family Eriophyidae (Acari: Eriophyoidea) from medicinal plants, Thailand are described and illustrated. There are Asetapatella ipomoneae gen. nov., sp. nov. on Ipomoea carnea subsp. fistulosa (Mart. ex Choisy) D.F. Austin (Convolvulaceae) and Aceria rotundifolii n. sp., on Mitragyna rotundifolia (Roxb.) Kuntze (Rubiaceae). Asetapatella ipomoneae gen. nov., sp. nov. is vagrant on the lower leaf surface, causing no apparent symptoms to the host plant. Aceria rotundifolii n. sp. caused erineum on both sides of the host's leaves.

A new species of genus Pseudoscirus Wurlitzer & Rocha, 2021, P. menglaensis Chen & Jin sp. nov. is described, which represents a newly recorded genus Pseudoscirus to China. And a key to species (adult females) of Pseudoscirus is given in the world.

In this study, we described and illustrated two new Aceria species (Eriophyidae: Eriophyinae: Aceriini) associated with the Asteraceae host plants in rangelands of Lahrud and Agh Qal'eh villages, in Meshginshahr county, Ardabil province, Iran. They are Aceria anthemis Lotfollahi et Hemmatzadeh sp. nov. on Anthemis arvensis L. and Aceria carthami Lotfollahi et Hemmatzadeh sp. nov. on Carthamus lanatus L. Both new mite species are vagrants causing no apparent damage to their host plants.

Oribatid mites (Acari, Oribatida) are a large group of soil animals, with small body sizes and complex morphological structures. At present, oribatid mite species identification is essentially based on morphological characters. In this study, we collected 124 specimens of oribatid mites belonging to 110 species of 72 genera in Russia, and extracted their genomic DNA subsequently. In order to investigate whether the molecular data (DNA-barcoding marker, COI gene) and morphological classification results are consistent, we used three methods, ASAP, ABGD and GMYC, to delimit species, and calculate a maximum likelihood tree. The results indicate that COI gene fragments can be effectively used for species delimitation. There are some cryptic species identified in oribatid mites, which do not have distinct morphological differences, but diverge considerably in molecular data. Meanwhile, some formerly unidentified species could be identified through molecular means. The study enriches the molecular data of oribatid mites worldwide and provides the basis for more detailed taxonomic studies of oribatid mites in Russia. In the future, more analyses and mining of molecular data, combined with morphological analyses, will help to reveal and further understand the phylogenetic relationships of Oribatida.