New records of exotic species of Oniscidea (Crustacea: Isopoda) from northern Mexico

Spanish; Castilian. Resumen A la fecha se han registrado en México 86 especies de 33 géneros y 16 familias de Oniscidea. Se revisaron colecciones de 4 instituciones académicas del norte de México y material recién recolectado en campo. De 1,820 especímenes, 1,417 (77.6%) pertenecen a 6 especies exóticas. Se presenta una relación taxonómica y una clave de identificación con láminas MEB. Se examinó la identidad molecular de 5 de las 6 formas exóticas a través del análisis del gen citocromo oxidasa 1 (ADNmt). Las especies determinadas son: Armadillidae, Cubaris murina; Armadillidiidae, Armadillidium vulgare; Porcellionidae, Agabiformius lentus, Porcellio laevis, P. scaber y Porcellionides pruinosus. Los oniscideos exóticos se registraron de zonas urbanas, rurales y naturales (áreas riparias) en 15 estados del norte de México, incluyendo los primeros registros formales en Aguascalientes, Chihuahua, Durango y Zacatecas. A. vulgare, P. laevis y P. pruinosus cohabitaron frecuentemente y son las especies más ampliamente distribuidas en esta región. A pesar de que la mayoría del material se registró de zonas urbanas (> 50% de sitios), A. vulgare y P. laevis se encontraron también en áreas riparias, y más aun, P. pruinosus se registró principalmente en zonas naturales (60% de 45 lotes examinados).

English. Abstract To date 86 species of 33 genera and 16 families of Oniscidea have been recorded in Mexico. Collections of 4 academic institutions and recent field materials were revised. From 1,820 specimens, 1,417 (77.6%) were determined to belong to 6 exotic forms. A taxonomic account and a species identification key with SEM plates of these exotic entities are presented. For morphological analysis we used light and SEM microscopy. The molecular identity of 5 of the 6 forms was examined through cytochrome oxidase 1 gene (mtDNA) analyses. The exotic species determined are: Armadillidae, Cubaris murina; Armadillidiidae, Armadillidium vulgare; Porcellionidae, Agabiformius lentus, Porcellio laevis, P. scaber, and Porcellionides pruinosus. The exotic oniscideans were recorded from urban, rural and natural (riparian) zones in 15 states of northern Mexico, including the first formal records in Aguascalientes, Chihuahua, Durango, and Zacatecas. Armadillidium vulgare, P. laevis, and P. pruinosus often co-occurred and are the most widely distributed species in this region. Although most of the material examined was recorded from urban zones (> 50% of studied sites), A. vulgare and P. laevis were also found in riparian areas (natural zones), yet P. pruinosus was recorded mainly from riparian areas (60% of 45 lots examined).