Arthropod communities of insular (São Miguel Island, Azores) and mainland (Portugal) coastal grasslands

The specimens collected were sorted and catalogued into a total of 534 arthropod species and morphospecies. In total, 67 species were common to both ecosystems. A total of 13,515 specimens were counted in the two coastal grasslands. We registered three new records for the Azores (in São Miguel Island), all being exotic: <i>Aritranisdirector</i> (Thumberg, 1822) (Hymenoptera, Ichneumonidae), <i>Draeculacephalabradleyi</i>, Van Duzee, 1915 (Hemiptera, Cicadellidae) and <i>Isodontia</i> sp. Patton, 1880 (Hymenoptera, Sphecidae). This publication demonstrates the importance of coastal grasslands as reservoirs for some potentially invasive arthropod species.