This study reports the current distribution in Mexico of Deroceras laeve (Müller, 1774) and D. invadens Reise, Hutchinson, Schunack and Schlitt, 2011, both previously recorded, and the first records of D. reticulatum (Müller, 1774) in this country. The taxonomic identifications were made on the basis of morphology and DNA sequences of a fragment of the cytochrome oxidase I gene. A phylogenetic analysis by maximum likelihood was carried out in order to support the identification and to explore the association of Mexican specimens. D. reticulatum and D. invadens appear restricted to the central portion of the country while D. laeve is widely distributed. Due to the invasive and pest character of these species, it is important to know their distribution in the country and the possible risk to native fauna and crops.
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