Matheus dos Santos Rocha

Mite fauna (Acari) in soybean agroecosystem in the northwestern region of Rio Grande do Sul State, Brazil

Abstract Soybeans (Glycine max (L.) Merril) (Fabaceae) are the most important grain crop in Rio Grande do Sul State, Brazil. Recently,significant infestations of phytophagous mites were observed in different regions of this state. This research aimed to identify the mite fauna associated with the soybean crop grown in the northwestern region of Rio Grande do Sul, particularly in Três de Maio and Mato Queimado counties. Assessments were made fortnightly in transgenic soybeans with irrigation (L1A) and without irrigation (L2A and B), in conventional soybeans without irrigation (L3C and D), and in edge plants (L1, 2 and 3). In soybean plants, we found 18,100 mites belonging to five families, nine genera and 12 species, besides those of Oribatida. Area L1A showed higher richness and abundance, with 10 species, followed by area L2B with insecticide application, with nine species. Lower richness was observed in L2A, with five species, and L3D showed lower abundance. Phytoseiidae showed higher richness, with five species, followed by Tetranychidae, with four species. Tetranychus urticae Koch, Mononychellus planki McGregor and Tetranychus ludeni Zacher were the most common phytophagous mites on soybean plants. Neoseiulus idaeus Denmark & Muma, Pseudopronematus sp., N. californicus McGregor and N. anonymus Chant & Baker. N. idaeus were the most common predators. On edge plants, T. ludeni and T. urticae were the most abundant, while N. idaeus and Agistemus riograndensisJohann & Ferla stood out among the predatory mites.

A new species of Rubroscirus from Brazil (Acari: Bdelloidea: Cunaxidae)

Abstract Rubroscirus nidorum sp. nov. is described and illustrated from chicken nests in a poultry house at Teutônia county, State of Rio Grande do Sul, Brazil. This is the first species of this family described from this State and the second of Rubroscirus for Brazil.

A new species of Scutopalus (Acari: Cunaxidae: Cunaxoidinae) from Rio Grande do Sul State, Brazil with a key to world species

Scutopalus tomentosus sp. nov. is described and illustrated from Plantago tomentosa Lam. (Plantaginaceae) in a vineyard agroecosystem at Dois Lajeados county, State of Rio Grande do Sul, Brazil. This is the first species of this genus described from the Americas. A key to world species is included.

A new species of the genus Brachytydeus Thor, 1931 sensu André, 2005 (Acari: Tydeidae) from Rio Grande do Sul State, Brazil, with a key to the species in the Americas

Brachytydeus scutatus sp. nov., a new species of tydeid mite from the Rio Grande do Sul State, Brazil, is illustrated and described based on specimens collected from plants growing near soybean fields. This is the first species of the genus Brachytydeus described within the country. A key to Brachytydeus species from the Americas is provided. http://urn:lsid:zoobank.org:pub:A6E1EA8F-BE90-4F78-8037-999300482AB9

A new species of Agistemus (Acari: Stigmaeidae) from yerba mate in the state of Rio Grande do Sul, Brazil

A new species of stigmaeid mite (Acari: Stigmaeidae) Agistemus paraguariensis sp. nov. is described and illustrated from the State of Rio Grande do Sul, Brazil, based on specimens collected on yerba mate (Ilex paraguariensis A. St.-Hil.) (Aquifoliaceae). A key to Brazilian species of the genus is provided. urn:lsid:zoobank.org:pub:D92FFB81-BD07-414E-A7B0-DDAA6C71CE52

Across continents: first species of Denheyernaxoides (Acari: Cunaxidae) from Americas

Abstract Denheyernaxoides americanus sp.nov. is described and illustrated from lichens and moss associated with bark of Ilex paraguariensis A. St. Hil. (Aquifoliaceae) in yerba-mate agroecosystem at Putinga municipality, Rio Grande do Sul State, Brazil. This is the first species of this genus found in Americas. New records of cunaxids Neobonzia moraesi (Den Heyer & Castro, 2008), Neocunaxoides andrei (Baker & Hoffmann, 1948) and Pulaeus pectinatus (Ewing, 1909) from Rio Grande do Sul State are also provided. A key to world Denheyernaxoides species is included.

Description of a new species of Transeius (Acari: Phytoseiidae) from the State of Rio Grande do Sul, Brazil

A new species of phytoseiid mites (Acari: Phytoseiidae) Transeius gervasioi sp. nov. is described from the State of Rio Grande do Sul, Brazil, based on specimens collected on Cichorium intybus L. (Asteraceae) and Plantago sp. (Plantaginaceae) plants. A key to Brazilian species of the genus is provided. http://zoobank.org/urn:lsid:zoobank.org:pub:5A59AFFF-F981-4273-917D-838602FAA99B

A new species of Neoseiulus (Acari: Mesostigmata: Phytoseiidae) with a key for the Brazilian species of the genus

Neoseiulus HUGHES, 1948 is currently one of the largest genus of Phytoseiidae Berlese. Neoseiulus demitei sp. nov., a new species of phytoseiid mite from Rio Grande do Sul State, Brazil, is illustrated and described based on specimens collected on Tibouchina sp. (Melastomataceae) plants. This new species differs from others by having most of propodossomal setae reaching the base of nearby setae and a constriction of ventrianal shield at level of preanal pores. Nevertheless, this new species is the first of the species subgroup kennetti described from Brazil. A key of Neoseiulus species reported in Brazil is also included.

First report of Cheletomimus (Hemicheyletia) gracilis (Acari: Cheyletidae) from Brazil

Cheletomimus (Hemicheyletia) gracilis Fain, Bochkov and Corpuz-Raros (2002) was collected on strawberry plants (Fragaria X ananassa Duchesne: Rosaceae) in greenhouse, for the first time in the state of Rio Grande do Sul, Brazil. Cheletomimus (H.) wellsi (Baker) and Cheletomimus (H.) duosetosus Muma are also reported.