ResumoEstudos sobre a diversidade e abundância de aranhas podem prover uma rica base de informações sobre o grau de integridade dos sistemas agrícolas em que se encontram. No milho transgênico as proteínas de Bacillus thuringiensis são expressas em grandes quantidades nos tecidos verdes das plantas, podendo afetar a comunidade de artrópodes. Portanto, o objetivo deste trabalho foi identificar a diversidade de aranhas associadas às cultivares de milho transgênico e convencional. Foram realizadas coletas com pitfall em talhões de milho Transgênico e Convencional durante todo o ciclo da cultura, em Cruz Alta, RS. Foram coletadas 559 aranhas, sendo 266 aranhas no milho transgênico e 293 aranhas no milho convencional. Foi determinado um total de 11 famílias e os indivíduos adultos distribuídos em 27 morfoespécies. As famílias com o maior número de representantes foram Linyphiidae (29,70%), Theridiidae (5,72%) e Lycosidae (5,01% AbstractStudies carried out on the diversity and abundance of spiders may provide a rich information base on the degree of integrity of agricultural systems where they are found. In transgenic corn, Bacillus thuringiensis proteins are expressed in great amounts in plant tissues and may affect arthropod communities. Thus, the main goal of this work was to identify the spider diversity associated to transgenic and conventional corn hybrids. Pitfall collections were performed in conventional and transgenic corn plots during the 2010/2011 crop season, at the experimental field of the Agronomy Course of the University of Cruz Alta, RS. A total of 559 spiders were collected, from which 263 were adults and 296 young individuals. In the transgenic corn 266 spiders were collected and in the conventional one 293. Eleven families were determined and the adult individuals grouped in 27 morphospecies. Families with the largest number of representatives were Linyphiidae (29.70%), Theridiidae (5.72%) and Lycosidae
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