Plants of the genus Nothofagus (Fagales, Nothofagaceae) has ancient South American-Australasian disjunctive distribution and represent a perspective model for biogeographical studies in Eriophyoidea. Among six currently known eriophyoid genera reported from Nothofagus (Acalitus, Aceria, Austracus, Cymoptus, Rectalox, and Nothacus) only genus Cymoptus was registered in western and eastern distribution areas of Nothofagus. In this paper we describe a new vagrant species, Solenocristus nothofagalisn. sp. (Phytoptidae, Sierraphytoptinae) collected from lower leaf surface of Nothofagus pumilio in Los Glaciares National Park (Patagonia, Argentina). Because all mite specimens in the sample were dead, amplification of three marker genes (COI, 18S, 28S) performed ten days after collecting data was unsuccessful. Morphological identification of the host plant was confirmed using PCR method and resulted in new sequences of 18S (MT164471) and ITS1–5.8S–ITS2 region (MT164174) of N. pumilio, deposited in GenBank.

Trhypochthoniellus comprises nine species, being mostly associated to aquatic vegetation; T. chilensis Ermilov & Weigmann as the only known species from North and South America. This genus is recorded for the first time in Mexico. Herein we present the description, illustrations and SEM photographs of Trhypochthoniellus churincensis sp. nov., which was found in association to lignocellulolytic microfungal taxa in the oligotrophic freshwater oasis of Cuatro Ciénegas Basin, Coahuila, México. T. churincensis sp. nov. is morphologically similar to T. longisetus (Berlese) and T. brevisetus Kuriki; however, it differs from both taxa by the presence of nine genital setae (11 to 13 setae), setae h3 subequal to other posterior notogastral setae; subcapitular setae h very short, and notogastral c1 larger. Additionally, we discuss information on food preferences and reproductive mode obtained through the observation of one cultured population maintained under laboratory conditions. A key to the species of Trhypochthoniellus is provided.

The Tarsonemidae (Acari: Prostigmata) exhibit a high diversity of feeding habits and morphological structures, which allow them to live in a diversity of habitats. Tarsonemus is the largest genus, with more than 280 described species belonging to three subgenera: Tarsonemus sensu stricto, Chaetotarsonemus and Schaarschmidtia. Eight species of the genus have been reported from Brazil. In addition, there are two new species, Tarsonemus cacaosp. nov. from Theobroma cacao L. (Malvaceae) branches, and Tarsonemus bahiensissp. nov. from Passiflora foetida L. (Passifloraceae) and Etlingera elatior Jack (Zingiberaceae) leaves. Both new species were collected in a cabruca agroforest, a traditional cacao cultivation system in the southern coast region of Bahia state. The new Tarsonemidae are described and illustrated here. Pharyngeal and gnathosomal structures of the new species are compared to other Tarsonemus species.

During the field study of eriophyoid mites associated with Lamiaceae species in semi-arid and arid environment in East Iran (Birjand, South Khorasan, Iran, summer 2017), two new eriophyid mite species (Trombidiformes: Eriophyidae) were discovered. They are Aceria pocriisp. nov. on Teucrium polium L. and Cecidophyes punctineasp. nov. on Rosmarinus officinalis L., and are illustrated and described herein. Both new species seemed to be vagrants on leaves and flowers, and they were not associated to any particular symptom.

A list of identified oribatid mite taxa from Uganda, including 21 species/subspecies from 17 genera and 14 families, is presented. A new species of the family Machadobelbidae is described from leaf litter. Machadobelba ugandaensissp. nov. differs from Machadobelba barbataSanyal, Saha & Chakraborty, 2005 and Machadobelba disparBalogh, 1958 by the presence of one pair of lateral teeth of the rostrum, prodorsal transverse ridge between costulae and foveolate body surface. Revised generic diagnosis and an identification key to the known species of Machadobelba are presented.

Proctotydaeus (Acari: Iolinidae) species live in bird nests, insect colonies, plants and barn straw, and comprise 17 species belonging to four subgenera. Here, we report three new species of Proctotydaeus mites living inside stingless bee colonies in Brazil. Proctotydaeus (Neotydeolus) lasaroi Da-Costa, Rodighero & Ferla sp. nov.,Proctotydaeus (Oriolella) dorsoreticulatus Da-Costa, Rodighero & Ferla sp. nov. and Proctotydaeus (Oriolella) quadrifasciatae Da-Costa, Rodighero & Ferla sp. nov. are described and illustrated based on specimens collected from three species of stingless bees in the state of Rio Grande do Sul, Brazil.

The marine intertidal zone constitutes one of the most interesting ecosystems on the earth. Oribatid mites of the family Fortuyniidae inhabit marine intertidal habitats in the tropical and subtropical coasts of the world. This family has not been known from Iran until now. The present work deals with a new oribatid species of this family found at the coast of the Gulf of Oman, southeastern Iran, from algae in the intertidal zone of a rocky shore. Fortuynia iranicasp. nov., is described from littoral environments of Chabahar Beach, Sistan and Baluchistan province based on adult and juvenile (deutonymph) stages. The new species is characterized by the presence of both prodorsal external and internal channels; fourteen smooth, thin and long notogastral setae, with a light-colored porose spot in the insertions, c₃ completely absent; sensilli with a very slightly oriented head; glove-like lenticulus; epimeral setation 3-1-3-2 and presence of one pair of aggenital setae. An updated diagnostic key to the adults of known species of Fortuyniavan der Hammen, 1960 is given.

Spider mite surveys conducted in Rio Grande do Sul state, Brazil, allowed us to provide the redescription of Tetranychus armipenis Flechtmann & Baker (Tetranychidae) from specimens collected on native plant species from Pampa biome, Rio Grande do Sul state. A new species of spider mite, Aponychus mauritianumsp. nov. is described and illustrated based on specimens collected from Solanum mauritianum Scop. (Solanaceae) in the municipality of Lajeado in the same state. New hosts for Atrichoproctus uncinatus Flechtmann and Schizotetranychus oryzae Rossi de Simons are also reported.

A new species of the genus Prostigmaeus Kuznetzov (Stigmaeidae), P. ampliussp. nov. collected from soil, grassy soil and litter samples from Turkey, is described and illustrated. This species can be distinguished by having apodemal marking, one pair of extra and non-setose dorsal platelets, having humeral shields, suranal shield entire and genual setal formula 5(+1κ)-5(+1κ)-2-2. Comparison of the chaetotaxy and some morphological features of Prostigmaeus species are provided as tabular data, and an updated key to the species is presented here.

Discotrachytes vanhartenisp. nov. is discovered and described based on females, males and deutonymphs collected in a banana plantation in Yemen. The new species differs from its congeners in the shape of the genital shield and the sternal setae of the females. A diagnosis of the genus Discotrachytes Berlese is presented with a list of the known species. Ten Uropoda species are moved to the genus Discotrachytes: D. ehimensis (Hiramatsu, 1979) comb. nov.; D. granata (Hiramatsu & Hirschmann, 1978) comb. nov.; D. grandis (Hiramatsu & Hirschmann, 1979) comb. nov.; D. granosa (Hiramatsu & Hirschmann, 1978) comb. nov.; D. orbis (Vitzthum, 1925) comb. nov.; D. ornata (Hiramatsu & Hirschmann, 1978) comb. nov.; D. procera (Hiramatsu & Hirschmann, 1979) comb. nov.; D. procerasimilis (Hiramatsu & Hirschmann, 1979) comb. nov.; D. regia (Vitzthum, 1921) comb. nov.; D. regiasimilis (Hirschmann, 1972); and D. verrucosa (Hiramatsu, 1980) comb. nov. A new key to the known Discotrachytes species is also presented.

A new species viz. Raphignathus kulaensissp. nov., collected from soil and litter under Cirsium vulgare (Asteraceae), Quercus sp. (Fagaceae), Rubus sp. (Rosaceae), Pyrus communis (Rosaceae), Verbascum sp. (Scrophulariaceae) and Astragalus sp. (Fabaceae) in Manisa and Denizli provinces (the Aegean region of Turkey), is described and illustrated based on adult female and male. A key to the species of Raphignathus from Turkey is provided.

Birjandtrombella farniae Noei gen. et sp. nov. (Acari: Trombidiformes: Prostigmata: Trombellidae) is described and illustrated from larvae ectoparasitic on moths (Lepidoptera: Crambidae, Noctuidae, Pyralidae), from Birjand city, South Khorasan province, Iran. Moth families Crambidae and Pyralidae are recorded as the host of Trombellidae larvae, for the first time. Also, a key to genera of Trombellinae Thor, 1935 of the world (larva) is presented.

Three new phytoseiid species of the subfamily Amblyseiinae, Neoseiulus laetussp. nov., N. uncinatussp. nov. and Chelaseius longicervixsp. nov., and the male of Neoseiulus madeirensis Papadoulis & Kapaxidi, are described from the Madeira archipelago. Moreover, six Amblyseiinae species are also reported for the first time from the islands and additional morphological information is provided for Euseius machadoi Ferragut & Peña-Estévez, with a discussion on the variability between Madeiran and Canarian populations.

A new species of the family Teneriffiidae, Teneriffia sebahatae sp. nov., is described. It was collected on the sea shore of Antalya, Turkey. It is distinguished from other species in this genus by the absence of “clasps” on the venter of the gnathosoma, fewer ventral setae and the number of solenidia on tarsi III and IV. A revised key to all the species of the genus Teneriffia is provided. The new species represents the first report of Teneriffiidae from Turkey.

Raoiella indica Hirst (Acari: Tenuipalpidae) is a polyphagous pest widely dispersed worldwide and a particular threat to crops from the Arecaceae family. Control measures are still being evaluated in recently invaded countries. A possible control strategy for this pest is the use of predatory mites. A recent study has suggested Neoseiulus barkeri Hughes (Acari: Phytoseiidae) as a potential biological control agent of R. indica. In the present study we determined the prey stage preference of N. barkeri when offered different stages of R. indica besides its functional response and numerical over its prey stage preferred. The predatory mite N. barkeri showed a marked preference for eggs over other stages of the prey. The regression analysis indicated that the predatory mite N. barkeri exhibited a Type II functional response. The prey density needed to start the oviposition was 10 R. indica eggs. The number of eggs laid by N. barkeri females increased with an increase in the prey density and tended to stabilize when prey availability was greater than 80 R. indica eggs, with average oviposition of 2 eggs/female. Our study suggests that N. barkeri shows potential to reduce populations of R. indica, especially at low prey densities. However, further studies are needed to investigate whether R. indica supports the development of immature stages of N. barkeri.

Two new species of oribatid mites of the family Damaeidae collected from the Russian Far East, are described. Belbodamaeus gobilliensissp. nov. is most similar to Belbodamaeus rarituberculatus Bayartogtokh, 2004, but differs from the latter by the larger body size, the absence of propodolateral apophyses and ventrosejugal tubercles, and the presence of prodorsobasal tubercles Ba, neotrichy on epimere II and five setae on femora III and IV. Epidamaeus chopeensissp. nov. is most similar to Epidamaeus nortoni Bayartogtokh, 2004, but differs from the latter by the smaller body size, the presence of comparatively long and narrowly phylliform dorsal notogastral setae, parastigmatic apophyses Sa and leg tarsi formula 22-18-18-15, and the absence of thick setae on leg segments.