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

Abstract

Sociedade Brasileira de Zoologia | www.sbzoologia.org.br | www.scielo.br/zool All content of the journal, except where identified, is licensed under a Creative Commons attribution-type BY-NC. Phytoseiidae (Acari: Mesostigmata) is a large family of predatory mites. They are fast-moving, active predators, feeding mostly on mites but also on small insects, nematodes and fungi, and may feed on plants, including pollen and extrafloral exudates. Owing to their success in spider control, Phytoseiids are the best known and most studied group of predatory mites (GERSON et al. 2003). The Amblyseiinae is the largest subfamily, with approximately 1,500 nominal species (CHANT & MCMURTRY 2007). Species of Neoseiulus HUGHES, 1948 have been commercially reared to be used as biological control agents of several species of thrips and other small pest insects and mites in Europe and North America over the past 20 years (BEARD 2001).Neoseiulus includes 389 described species (DEMITE et al. 2014) found in all zoogeographic regions, except Antarctica, in a wide variety habitats (CHANT & MCMURTRY 2003). Twenty species of Neoseiulus have been reported from Brazil. Of these, eight had already been found to occur in the state of Rio Grande do Sul (DEMITE et al. 2014.In this article, a new species of barkeri species group, Neoseiulus demitei sp. nov., is described and illustrated from specimens collected in the State of Rio Grande do Sul, Brazil. A key to Brazilian Neoseiulus species is also included. MATERIAL AND METHODSThe mites were collected from leaves of Tibouchina sp. (Melastomataceae), observed under a binocular microscope, mounted on glass slides in Hoyer's medium and observed under a phase contrast microscope Leica ® DM 750. Drawings were made using a camera Lucida apparatus and the lines were highlighted using Corel Draw X5 ® .The classification system used is that of CHANT & MCMURTRY (2007). The setal nomenclature is that of ROWELL et al. (1978) and CHANT & YOSHIDA-SHAUL (1992) for the dorsal and ventral surfaces of the idiosoma, respectively. Measurements are given in micrometers (µm), holotype measurements are shown in bold type followed by their mean and range within parentheses. TAXONOMYNeoseiulus demitei sp.nov. (Fig. 2): sternal shield smooth, with three pairs of setae and two pairs of lyrifissures, seta St4 set on distinct metasternal shields; distances between St1-St3 67 64 (61-67), St2-St2 67 66 (65-67

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