A morphology-based parsimony analysis (50 taxa; 110 characters) focused on relationships among basal acariform mites places Eriophyoidea (formerly in Trombidiformes) within Nematalycidae (Sarcoptiformes). Although both taxa have worm-like bodies, this grouping is unexpected because it combines obligate plant inhabitants (Eriophyoidea) with obligate inhabitants of deep-soil or mineral regolith (Nematalycidae sensu stricto). The Eriophyoidea Nematalycidae clade, which is strongly supported (Bremer =5; bootstrap =85%), retains moderately good support (Bremer=3; bootstrap=66%) when three ratio-based characters pertaining to body shape are excluded. A total of eleven unambiguous synapomorphies unite all or some of Nematalycidae with Eriophyoidea. These include an annulated opisthosoma, an unpaired vi seta on the prodorsum, fusion of the palp trochanter with the palp femur, and a large relative distance between the anus and the genitalia. Three of the four Triassic genera of eriophyoid-like mites were also included in our analysis. Although all four genera have been tentatively placed within a new superfamily, we found no support for the monophyly of this group. One other interesting result of the analysis is the placement of a “living fossil”, Proterorhagia oztotloica (Proterorhagiidae), as sister to the rest of Acariformes. However, support for this relationship is weak.

Nine new species of eriophyoid mites from the Hengduan Mountains, southwestern China are described and illustrated. They are Cosella delavayi sp. nov. on Castanopsis delavayi Franch. (Fagaceae); Tegonotus fabris sp. nov. on Abies fabri (Mast.) Craib (Pinaceae); Phyllocoptruta hodginsii sp. nov. on Fokienia hodginsii (Dunn) Henry et Thomas (Cupressaceae); Calvittacus mollissimus sp. nov. on Castanea mollissima (Fagaceae); Anthocoptes artemisia sp. nov. on Artemisia sp. (Asteraceae); Tetraspinus fabaceae sp. nov. on Cajanus cajan (L.) Mill sp. (Fabaceae); Neorhynacus molle sp. nov. on Rhododendron molle (Blume) G. Don (Ericaceae); Rhyncaphytoptus dielsianus sp. nov. on Trema dielsiana Hand.-Mzt (Ulmaceae) and Konola mollissima sp. nov. on Castanea mollissima (Fagaceae). All these new eriophyoid mite species are vagrants causing no apparent damage to their host plants.

During a survey on Eriophyoid Mites in southwest of East Azerbaijan province (Iran), Aceria zygofabae n. sp. and Aceria alkannae n. sp. were found on Zygophyllum fabago L. (Zygophyllaceae) and Alkanna bracteosa Boiss. (Boraginaceae), respectively. They are described and illustrated here. Four further Aceria species were collected and identified as A. eucricotes (Nalepa, 1892), A. cynodonis Wilson, 1959, A. chenopodia Xue, Sadeghi & Hong, 2009 and A. tristriata (Nalepa, 1890) (protogyne and deutogyne). Aceria cynodonis is a new record for Iran Eriophyoid fauna whereas the other species were found for the first time in East Azerbaijan.

Tetranychus turkestani is a serious pest of cotton, corn, vegetables, fruit trees and forests in Xinjiang. All life stages of T. turkestani were observed using both light and scanning electron microscope. The egg is smooth and spherical. The eupathidial spinnerets of larva and protonymph are different from that of the deutonymph and adult in shape. The spinneret of adult female is obviously thicker and larger than that in male. The palpfemoral seta of adult male is a short, stout, spine-like process. T. turkestani has fourteen pairs of dorsal setae. The number of ventral setae increases regularly in number in each molt. The leg chaetotaxy has a great change from larva to deutonymph.

A revised species list is given for tenuipalpids and tetranychids published from the territory of Hungary. Numerous doubtful data are deleted. The following species are not members of the Hungarian fauna, Tenuipalpidae: Aegyptobia beglarovi Livsic & Mitrofanov, 1967, Brevipalpus russulus (Boisduval, 1867), Tenuipalpus rosae Kadzhaja, 1955; Tetranychidae: Bryobia alpina Mathys, 1962, Bryobia kakuliana Reck, 1956, Bryobia lonicerae Reck, 1956, Panonychus citri (McGregor, 1916), Petrobia apicalis Banks, 1917 and Tetranychus spireae Reck, 1948. On the basis of the updated list, the Hungarian fauna contains 19 tenuipalpid and 37 tetranychid species.

Unguizetes ermilovi sp. nov. from Malaysia and its morphological ontogeny is described and illustrated and compared with congeners. The adult of U. ermilovi sp. nov. has well developed lamellae and translamella, being the most similar to U. clavatus Aoki, 1967 and U. inermis Mahunka, 1990, but differs from them by the shape of the lamellar complex and porose areas on the notogaster. Most prodorsal and gastronotal setae of juveniles of the new species are long. The larva has 12 pairs of gastronotal setae, of which c₂, la and lp are of medium size and h₃ is short, and c₂, l-series and h₁ are with excentrosclerites. The nymphs have 15 pairs of setae, of which c₂, la and p-series are short, and all gastronotal setae are with excentrosclerites.

Two new species of oribatid mites of the superfamily Trizetoidea (Acari, Oribatida) are described from the Philippines. Eurhynchoribates (Eurhynchoribates) nuevavizcayaensis sp. nov. (Rhynchoribatidae) is similar to E. (E.) pocsi (Mahunka, 1986) in having the interlamellar setae the longest of the setae on the prodorsum, setiform, thickened; mostly long notogastral setae; setiform, thickened aggenital and adanal setae; and localization of ad₃ in paraanal and adanal lyrifissures in inverse apoanal positions. It differs by the pointed rostrum, h₁ longest of the setae on the notogaster, and the absence of lateral teeth on the rostrum. Suctobelbila trifasciata sp. nov. (Suctobelbidae) is similar to S. baderi Mahunka, 1988 in having two lateral longitudinally oriented ridges on the notogaster, but differs by its larger body size, in having two or three pairs of rostral teeth, three longitudinal notogastral ridges, six pairs of genital setae and the absence of humeral tubercles.

Collemboerythraeus vosoughae Noei, Saboori and Hakimitabar gen. et sp. nov. (Acari: Erythraeidae) is described and illustrated from larvae ectoparasitic on unidentified springtails (Hexapoda: Collembola: Sminthuridae) from Jahrom city, Fars province, and also from soil samples (off host) from Khorramabad city, Lorestan province, Iran. A key to the genera of larval Erythraeinae is presented.

A new diagnosis and the type genus of Macrodinychidae fam. nov. are given with the description of a new and very extreme macrodinychid mite (Macrodinychus tanduk sp. nov.) from Sumatra, Indonesia. The two horn-like processes formed on the anterior region of idiosoma, a strongly sclerotized half-ring-like court situated posterior to genital opening and the large and semicircular pygidial shield are unusual character states within the family Macrodinychidae. A new, updated key to the macrodinychid species is given.