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One new species of genusTranseiusis described from arborescent ferns from Brazilian Mixed Ombrophylus Forest, Rio Grande do Sul State, Brazil. These new species differ from other species by having smaller spermathecae and differences in the setaeZ4 Z5ands4as well as in the macrosetae. The male ofTranseius kroeffisGonçalves & Ferla is described and the female redescribed to account for a new hypothesis on thej-series setae. A dichotomous key for the BrazilianTranseius speciesis provided. [ABSTRACT FROM AUTHOR]

House dust mites (HDM) are globally distributed in human habitats. The most favourable locations for their development are carpets, curtains, couches, mattresses and pillows. This association with indoor environments makes HDM one of the most important sources of indoor allergens. Distribution and concentration may be influenced by food availability, temperature and, mostly, humidity. This study investigated seasonal and environmental patterns in HDM communities in order to understand the influence of housing type and climate conditions on their richness, abundance and concentration. We sampled four different types of housing (brick houses, wooden houses, carpeted apartments and tiled-floor apartments) and four habitats (double mattress, couch, curtain and carpet). We carried out four samplings in 2010, each one in a season of the year, and collected a total of 128 samples. We analysed richness, abundance and concentration of all sample units. We found a total of 1653 mites.Blomia tropicalis(van Bronswijk, Cock & Oshima, 1973),Dermatophagoides farinaeHughes, 1961 andTarsonemus fusariiCooreman, 1941 were the most abundant species. All variables tended to decrease from winter to summer. Wooden and carpeted houses had higher richness and abundance than brick houses and tiled-floor apartments. Curtain had the highest concentration, followed by double mattress, couch and carpet. We found seasonal and environmental variations in the community structure of HDM. Concluding, we demonstrated the prevalence of allergenic indoor mites in the coldest months, in more favourable conditions of wooden and carpeted houses. This study indicates that through careful regulation of climatic conditions, housekeeping policies and laundering procedures, dust mite and allergen levels can be controlled even in a climate suitable for the development of breeding mite populations. [ABSTRACT FROM AUTHOR]

Two new species of Tydeidae are described, Brachytydeus lorenzatus sp. nov. and Quasitydeus feresi sp. nov. Brachytydeus lorenzatus sp. nov. differs from B. aegyptiaca (Rasmy & El Bagoury, 1979) by having a reticulated area on the region of f1 and f2, dorsal setae smooth, solenidion vI shorter than or equal to the width of tarsus I, most setae on dorsal shield shorter than the length between their bases and setae d forked distally. The new species is distinguished from B. scutatus Silva, Rocha & Ferla, 2013 by having a slightly reticulate area on the aspidosoma, near setae bo, all dorsal setae slender and club-shaped. Quasitydeus feresi sp. nov. differs from the only other species of the genus, Q. ricensis (Baker, 1970), by having all dorsal setae simple and serrated, similar in shape. Eleven tydeoid species are reported also from several plants native to the state of Rio Grande do Sul, Brazil. This is the second species of Brachytydeus Thor, 1931 described from and the second species described for Quasitydeus Kazmierski, 1996. [ABSTRACT FROM AUTHOR]

A new species of Transeius Chant and McMurtry is described from the State of Rio Grande do Sul, in southern Brazil, based on specimens collected on Eupatorium laevigatum Lam. (Asteraceae). [ABSTRACT FROM AUTHOR]

Many mite species disperse via the air. However, most methods described for the study of aerial dispersal have some limitations in the collection and/or recovery of mites that could be improved. The aim of this study was to describe a rotatory funnel-shaped collector that directs the wind to adhesive surfaces covered with a glycerin-based solution. Tests were conducted on a soccer field at UESC, Ilhéus, Brazil, in four 8-day periods. In total, 330 mites of 52 species of Eriophyidae, Tarsonemidae, Diptilomiopidae, Iolinidae, Triophtydeidae, Astigmata, Tydeidae, Phytoseiidae, Scutacaridae, Oribatida, Ascidae, Dolichocybidae, Eupodidae, Pygmephoridae and Tenuipalpidae were collected. Of the mites captured in the first three periods, 67% were Aceria sp. (Eriophyidae), and in the fourth period 46% were Coccotydaeolus aff. bakeri and Paurotyndareus sp. (Iolinidae). Comparisons between the funnel-shaped collector with the tube-shaped rotatable model of Duffner et al. (J Pest Sci 74:1-6, 2001, adapted from Schliesske 1977) showed that the former captured >3× the number of mites and 2× the number of species. In conclusion, it is expected that the method described here could help in future pest management, and help solve ecological and behavioral problems involving airborne mite dispersal, offering a tool for monitoring, counting and identifying mites, or even other small arthropods, pollen and fungal spores, in experimental and applied studies., (© 2022. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)

House dust mites (HDM) are the main source of aeroallergens worldwide, yet epidemiological differences between socioeconomic factors in association with this medical condition have not been studied in the south region of Brazil. To assess the prevalence of HDM in two socioeconomically distinct populations of patients with allergic asthma or rhinitis, the differences between samples from houses of high-income families and low-income families were analyzed. Mite samples were collected between July and December 2015, in Porto Alegre, Brazil. The HDM were Dermatophagoides pteronyssinus and Dermatophagoides farinae (Hughes; Acari: Pyroglyphidae). Also, other non-pyroglyphid house mites were identified in dust samples: Tyrophagus putrescentiae (Schrank; Acari: Acaridae), Chortoglyphus arcuatus, and Cheyletus malaccensis. Identification of species was performed through morphological keys with a stereomicroscope and a phase optical microscope. A total of 104 homes was evaluated (low-income group: n = 53; high-income group, n = 51). We found a total of 721 mites, representing 11 species, in 93 (89%) houses. In the remaining houses, no mites were found. We observed no significant differences of species composition between the groups studied. However, the number of mites was significantly higher in the low-income group (P < 0.001). D. pteronyssinus was the predominant species detected, with 286 mites (39.6%). D. farinae was not detected in any sample. Our results show that living-rooms from low-income families present higher numbers of HDM.