Collemboerythraeus izadpanahi sp. nov. (Acariformes: Erythraeidae) is described and illustrated from larvae ectoparasitic on unidentified springtails (unfortunately hosts got lost and therefore could not be identified) (Hexapoda: Collembola: Sminthuridae), from Simkan region, Jahrom city, Fars province, Iran. The generic diagnosis of the genus Collemboerythraeus and key to world genera of larval Erythraeinae are amended.

Until now the mite genus Cosmolaelps Berlese was represented in Brazil by eleven species. A new species, based on adults collected exclusively from the brood of the ponerine ant Neoponera inversa (Smith) (Hymenoptera: Formicidae) is described. Colonies of this ant were found in dried cocoa pods fallen on the floor of a cocoa tree plantation in southern Bahia. It is suggested that the mite uses the ant mainly for phoresy as these mostly arboreal ants, commonly change the site of their colony, quickly carrying the brood from one place to another.

The morphological ontogeny of Platyliodes scaliger (C.L. Koch, 1839) is described and illustrated. The adult of this species has a flattened notogaster, with two pairs of leaf-like setae on its posterior end. The adult and nymphs carry the exuvial scalps of previous instars on the dorsal part of the hysterosoma. The cuticle of the juveniles is plicate, and the larva has 10 pairs of gastronotal setae (c₁ and dp absent), whereas the nymphs have six pairs (h- and p-series). The nymphs also have a posterior excrescence, which bears a long, setiform seta h₁, and a clearly shorter, leaf-like seta p₁. During the ontogeny of P. scaliger, the number of gastronotal setae is highly reduced from 10 pairs in the larva to six pairs in the nymphs, and four pairs in the adult (h₁ and p-series remain).

Two new oribatid mite species of the genus Licnodamaeus (Oribatida, Licnodamaeidae) are described based on adult material collected from a termite nest in South Africa. Licnodamaeus navalhillensis sp. nov. is similar to L. travei (Covarrubias, 1998) comb. nov., but differs by the clavate bothridial setae. Licnodamaeus sacculatus sp. nov. is similar to L. asetosus (Ermilov & Hugo-Coetzee, 2012) comb. nov., but differs by the unilaterally dilated bothridial setae, four pairs of notogastral setae, tridactylous legs and saccules on all leg femora and trochanters III, IV. The taxonomic status of the genus Licnodamaeolus is discussed, resulting in the following taxonomic proposal: Licnodamaeus Grandjean, 1931 (=Licnodamaeolus Covarrubias, 1998 syn. nov.).

The present study is based on oribatid mite material (Acari, Oribatida) collected from the city of Hanoi in Northern Vietnam. A list of identified taxa, including 68 species from 49 genera and 32 families, is presented; of these, ten species (Trhypochthonius japonicus, Nothrus oblongus, Hermanniella aliverdievae, Arthrodamaeus decemsetiger, Arcoppia fenestralis orientalis, Ramusella puertomonttensis, Allosuctobelba grandis, Scheloribates elegans, Neoribates gracilis, Pergalumna corniculata) and one genus (Trhypochthonius) are recorded in the Vietnamese fauna for the first time; seven species (Xenillus selgae, Arcoppia curtipila, Cycloppia granulata, Hammerella gracilis, Allosuctobelba tricuspidata, Ceratozetoides maximus, Protoribates hakonensis) and one genus (Ceratozetoides) are recorded in the Oriental region for the first time. Two new species belonging to the genera Allosuctobelba and Oribatella are described: Allosuctobelba alexanderkhaustovi sp. nov. differs from Allosuctobelba tricuspidata tricuspidata Aoki, 1984 in the rostrum having three to four lateral teeth and very long notogastral setae positioned in two parallel rows; Oribatella pavelklimovi sp. nov. differs from Oribatella kunsti Bernini, 1972 by the granulate body surface, setiform aggenital setae and the dorsolateral position of notogastral setae lm and lp.

The sweet cherry Prunus avium L. and sour cherry Prunus cerasus L. are considered important fruit trees, providing valuable and delicious fruit worldwide. We compared the susceptibility of 10 cultivars of sweet cherry and 5 genotypes of sour cherry to Bryobia rubrioculus Scheuten feeding by manually counting brown spots and by measuring damaged leaf area using a computerized image analysis technique. Damaged leaves were individually scanned on a common flatbed color scanner on a white background. The cultivars and genotypes of sweet and sour cherries, based on the mean area percentage having feeding symptoms on the leaves, were classified into three groups: (1) “susceptible”, i.e., Hamedan, BN 5150, BT 5148, Zard-90, KB 9 and KB 10; (2) “semi-resistant”, i.e., KB 21, Sabima, BT 5124, KB 25 and Lambert; and (3) “resistant”, i.e., Haj Yousefi, BO 5187, BT 5154 and Siah Mashhad. A corresponding increase in the mean value of the symptom area was observed as the number of adult brown mites increased per disc. The results of both methods were compared, and the advantages of each method were discussed.

Two new genera and three new species of the Eriophyidae from Chiang Mai province, Thailand were described. They are Kanphra dichotomae gen. nov., sp. nov. on Schumannianthus dichotomus (Roxb.) Gagnep., Ekaphyes daengii sp. nov. and Daengarus xylocarpus gen. nov., sp. nov. on Xylia xylocarpa (Roxb.) Taub.

This paper presents a new species from China, Neobonzia neomalookensis sp. nov. which is described and illustrated in detail based on adult females and protonymphs. This new species resembles N. malookensis Bashir & Afzal, 2009, but can be easily distinguished by the following features: Palp tibiotarsus with 1 spine-like seta, 1 tubercle and 4 simple setae. Genu III with 1 asl and genu IV with 1 asl. Tibia I with 1 bsl, tarsus I with 3 bsl. A key to females of China is given.

A survey was carried out to determine the native Phytoseiidae (Mesostigmata) species in Kasnak Oak Forest Nature Reserve, southwestern Turkey, an extremely reach forest habitat. In this study, Typhlodromus (Anthoseius) commenticius Livshitz & Kuznetsov and Typhloseiulus calabriae (Ragusa & Swirski) are reported for the first time in Turkey. In addition, Neoseiulella kazaki sp. nov. is described based on two adult females. The species newly recorded are re-described to allow the determination of intraspecific variations.

A new species Spatulaphorus altaicus sp. nov. (Acari: Pygmephoridae) collected from under the elytra of scarab beetle Geotrupes baicalicus Reitter (Coleoptera: Geotrupidae) is described. A key to species of the genus Spatulaphorus of the world is provided.

A new species of opilioacarid mite, Neocarus belizensis sp. nov., is described from mid-level elevations in Belize's Maya Mountains. Laboratory observations confirmed that females nearly always deposit only one egg at a time, and that eggs are coated before deposition. Females guard both eggs and larvae. The larvae are non-feeding and molt quickly to protonymphs. Adults appear to facilitate feeding by protonymphs. Actual mating could not be observed, but pre-mating behavior is documented.

Knowledge about the fauna of scutacarid mites (Heterostigmatina, Pygmephoroidea, Scutacaridae) on the Iberian Peninsula is very scarce. In order to increase information on Iberian scutacarids, collections were performed in the south of Andalusia, resulting in one new species Scutacarus tarifae sp. nov. and four new records for the Iberian Peninsula: Diversipes exhamulatus (Michael, 1886), Scutacarus carinthiacus Ebermann, 1979, S. echidna (Berlese, 1905) and S. eucomus (Berlese, 1908). The first descriptions of male and larva of S. eucomus are provided, and the unusual shape of the pharyngeal pumps of S. carinthiacus is discussed.

Juvenile instars of oribatid mites of the family Phenopelopidae are well known compared to most other families, however, information on the morphological ontogeny of the majority of species is still insufficient or unknown. Comparative characteristics of immatures of species of Phenopelopidae are given based on our own data and available literature sources. The major characteristics of immature instars of 11 species are presented, and the morphological ontogeny of Eupelops variatus (Mihelčič, 1957) is investigated based on material from southern Europe. From these studies, it can be generalized that the juvenile morphologies of phenopelopid genera are quite similar and uniform. The juveniles have plicate integument, marginally flattened opisthonotum, and short gastronotic setae c₁, c₃ and of the d-series. The juveniles of the phenopelopid species differ from one another in morphological characters such as body size, development of the prodorsal ridges, lamellar, interlamellar as well as gastronotic setae of c₂, lp and h-series either in larva or nymphs, and all these characters have species-specific value.

Nine species of water mites (Acari, Hydrachnidia) were collected in 2017 from two rivers in Sri Lanka. One genus, i.e. Srilankurus, and four species, i.e Atractides biesiadkai, Axonopsis srilankensis, Brachypodopsis mirkae and Srilankurus biprojectus are described as new for science; Monatractides pinapalpis (Cook, 1967), a species so far known from India only, is reported as new for the fauna of Sri Lanka. The number of water mites known from Sri Lanka now tallies 60 species.