Three feather mite species of the genus Brephosceles Hull, 1934 (Alloptidae: Alloptinae) were found on the European storm petrel, Hydrobates pelagicus (Procellariiformes: Hydrobatidae), in the Mediterranean Sea and North-east Atlantic Ocean. Brephosceles holoplax sp. n. is described as a new species; B. pelagicus (Vitzthum, 1921) and B. longirostris (Vitzthum, 1921) comb. n. formerly known only from females are redescribed from both sexes. The latter species has been transferred from the genus Alloptes Canestrini, 1879. All descriptions are supported by DNA barcode data.

One new genus, ten new species, and four new records of eriophyoid mites from Tibet are described and illustrated. They are Eriophyes clematus sp. nov. on Clematis buchananiana DC. (Ranunculaceae), Eriophyes niveus sp. nov. on Rubus niveus Thunb. (Rosaceae), Plancorpus populi gen. nov. & sp. nov. on Populus simonii Carrière (Salicaceae), Aculochetus desmodius sp. nov. on Desmodium elegans DC. (Leguminosae), Aculus trilobus sp. nov. on Prunus triloba Lindl. (Rosaceae), Tetra hyperica sp. nov. on Hypericum bellum Li (Hypericaceae), Calepitrimerus buchananianus sp. nov. on Clematis buchananiana DC. (Ranunculaceae), Calepitrimerus tanguticus sp. nov. on Clematis tangutica (Maxim.) Korsh. (Ranunculaceae), Phyllocoptes excoecarus sp. nov. on Excoecaria acerifolia Didr. (Euphorbiaceae), Neorhynacus pistacus sp. nov. on Pistacia weinmanniifolia J. Poiss. ex Franch. (Anacardiaceae), Anthocoptes punctidorsa Keifer, 1943 rec. nov. on Ulmus pumila L. (Ulmaceae), Vittacus bougainvilleae (Keifer, 1959) rec. nov. on Bougainvillea spectabilis Willd. (Nyctaginaceae), Phyllocoptes cedri Keifer, 1946 rec. nov. on Cedrus deodara (Roxb. ex D. Don) G. Don (Pinaceae), and Diptacus hamedanicus Jafari & Khanjani, 2020 rec. nov. on Prunus triloba Lindl. and Prunus armeniaca L. (Rosaceae).

Seven new species of the family Phthiracaridae, Arphthicarus diversus sp. nov., Arphthicarus parasculptilis sp. nov., Arphthicarus quasitrichosus sp. nov., Notophthiracarus dissimilis sp. nov., Notophthiracarus insolitus sp. nov., Notophthiracarus paralineolatus sp. nov., and Atropacarus (Hoplophorella) levidensus sp. nov., are described and figured from soils of Afromontane forests from Mulanje Mts., Zomba Mts., and Dedza Mts., in South Malawi. A comparison of morphological similarities with the most closely related species is presented. Two species Acrotritia paraardua Niedbała et Starý, 2015, and Phthiracarus anonymus Grandjean, 1933 are redescribed and figured. In total 22 species of ptyctimous mites are recorded from forest soil in Malawi, 11 of them are new records for oribatid fauna of Malawi.

Both genera studied here, Rhinoppia and Suctobelbella are diversely represented in the northern hemisphere, but in Korea, only three species of the second genus are known. We propose a new species, Rhinoppia properecta sp. nov., and provide supplementary descriptions of seven species of Suctobelbella, i.e., S. acutidens (Forsslund, 1941), S. arcana Moritz, 1970, S. longidentata Chinone, 2003, S. subcornigera (Forsslund, 1941), S. (Flagrosuctobelba) kantoensis Chinone, 2003, S. (F.) lata Chinone, 2003, and S. (Ussuribata) latirostris (Strenzke, 1950), which are reported from Korea for the first time. The distribution and diversity of each genus are discussed, and habitat ecology of species reported is given. Furthermore, a key for the identification of adults of the known species of Suctobelbella in Korea, is provided.

Gynandromorphism is a condition in which an organism exhibits both male and female characters simultaneously. This condition is the result of an abnormal process during embryonic development, and has been frequently reported in arthropods, especially crustaceans, insects, and arachnids. Here, we report a case of gynandromorphism in the brown dog tick, Rhipicephalus sanguineus s.l. in Colombia. The individual was collected from a domestic dog in the municipality of Samaná, Department of Caldas, in the inter-Andean Valley of the Magdalena River Basin of the country. This record is the first documented for this species in Colombia, and the fourth in America where this anomaly was previously reported in countries such as Brazil (two cases) and Mexico (one case).

New records of water mites from Iran and Turkey revealed by DNA barcoding are presented. DNA barcodes were recovered from 44 water mite specimens morphologically assigned to 18 species. The DNA barcoding data for the twelve species were uploaded into the BOLD database. One species of the Hygrobates longiporus-complex, H. thori Pešić & Smit sp. nov. is described as new for science and Hydrodroma persica Pešić & Saboori, 2012 is reported as new for Turkey. We propose to lower the taxonomic status of Hydrodroma golestanica to a subspecies of H. torrenticola, i.e. H. torrenticola golestanica nov. stat.

We reported two new records of eriophyoid mites from Hungary—Proiectus farkasi (Boczek) comb. nov. collected from Pinus nigra J.F. Arnold (neotype), which was transferred from Phyllocoptes, and Trisetacus confusus Livshits et Vasilieva found on Pinus nigra and P. nigra subsp. salzmannii (Dunal) Franco (Pinaceae). We redescribed P. farkasi and T. confusus in detail, including morphological descriptions of the female, male, and nymph.

Sennertia is a diverse and widely distributed genus of mites within the family Chaetodactylidae, and the most successful group of mites in establishing phoretic relationships with bees. Although 77 valid species of Sennertia are known in the world, only two species, Sennertia (Sennertia) gargantua Zachvatkin and Sennertia (S.) zhelochovtsevi Zachvatkin have been recorded from Turkey. But, these two bee-associated species have not been noticed and not listed in the studies on mite fauna of Turkey. OConnor & Klimov in 2003 and Klimov & OConnor in 2008 stated that the distribution information of Sennertia (S.) gargantua in Turkey was probably an error. This paper reports the presence of Sennertia (S.) gargantua on a Carpenter bee in Turkey with an additional new record of the genus from Turkey, viz. Sennertia (S.) cerambycina (Scopoli). In the present work, a key to the known species for Turkey is also provided. It is noticed that genital setae are duplicated on the right side of an examined specimen of Sennertia (S.) gargantua. In the genus, some variations and local anomalies have been previously recorded; however, no abnormalities of the genital setae in Sennertia have been reported.

The morphological ontogeny of Platynothrus coulsoni sp. nov. is described and illustrated. This species is the most similar to P. quadristriatus Hammer, 1958 as adult, but differs from it mainly by having more longitudinal ridges on the notogaster and fewer genital setae. Most prodorsal and gastronotal setae of the larva of P. coulsoni are of medium size and smooth, except for barbed h₁, and in the nymphs these setae are relatively short. In all instars, one pair of hypostomal setae m is present, and palp femur has one seta. The setation of leg setae of P. coulsoni is generally similar to that of P. punctatus (L. Koch, 1879), but differs from it mainly by having more setae on tarsi I–III of deutonymph and tritonymph, and all tarsi of adult.

The systematic position of Fuscozetes setiger (Trägårdh, 1910) n. comb. is investigated in the light of ontogenetic studies. This species is classified by most authors as Trichoribates Berlese, 1910, but this classification is not supported by the morphology of juvenile stages of this species. In all juveniles of F. setiger, a humeral organ is present, and all nymphs have a humeral sclerite, which is typical of Fuscozetes Sellnick, 1928. The larva has a pygidial sclerite, with three pairs of setae (dp, lp, h₁), the nymphs have a gastronotal sclerite, with 10 pairs of setae (d-, l-, h-series and p₁), and setae p₂ and p₃ are inserted on unsclerotized integument. The nymphs have a large humeral sclerite, bearing seta c₁, while setae c₂ and c₃ are inserted on unsclerotized integument. The adult of F. setiger has thin seta l″ on genu and tibia I and II, which is typical of Fuscozetes.

Predator-prey interactions are fundamental to the understanding of ecological communities. The non-consumptive effects of predators on the food web can be more prominent than direct killing. However, the non-consumptive effects in intraguild interaction have rarely been studied. This study determined the non-consumptive effects of an intraguild predator Blattisocius dentriticus on Neoseiulus cucumeris. The responses of N. cucumeris to the predation risk of B. dentriticus adult females were examined in a laboratory test. The developmental response of N. cucumeris to predation risk was sex-specific: the presence of B. dentriticus cues prolonged the immature development of N. cucumeris males and increased their consumption rates of Tyrophagus putrescentiae eggs, but did not affect the development and prey consumption of female N. cucumeris. The size at maturity of N. cucumeris was not affected by predation risk from B. dentriticus. This study demonstrated that intraguild predators can have substantial non-consumptive influence on intraguild prey.

This paper deals with a new species of genus Parabonzia and newly recorded genus Bonzia from China. Parabonzia bioxys Chen & Jin sp. nov., which is described and illustrated based on adult females collected from rotten wood in Hainan Province, China, differs from all other Parabonzia by the dorsal seta of the palp telofemur having two tines instead of three or more (most species) or being unbranched (P. mindanensis Corpuz-Raros, 1996). Bonzia halacaroides Oudemans, 1927 is redescribed based on adult females collected from fallen leaves in Jiangxi Province and Chongqing City, China, which represents a newly recorded genus Bonzia Oudemans, 1927 to China and adds more details and new illustrations to its original description.