Current status of the invasion of Meghimatium bilineatum (W.H. Benson, 1842) and M. pictum (Stoliczka, 1873) (Philomycidae: Gastropoda), with the first record of M. pictum from Bangladesh based on molecular data

Abstract

To address the challenge of biological-invasion management, it is imperative to accurately identify and comprehend the native and non-native distribution of introduced species. This study focuses on documenting the invasion status of 2 invasive land slugs, Meghimatium bilineatum (W. H. Benson, 1842) and M. pictum (Stoliczka, 1873), which have the potential to negatively impact native ecosystems, agricultural production, and human health. By conducting an exhaustive literature review and molecular examination, we identified M. bilineatum in 15 countries and regions, of which 5 are introductions and 3 potential introductions. Similarly, M. pictum was found in 14 countries and regions, with 2 introductions and 2 potential introductions, including 1 newly recorded country, Bangladesh. These regions are rich in biodiversity, including World Heritage Sites, warranting careful assessment of the impact of these slugs on biological conservation. On the other hand, many countries and regions lack sufficient data to conclusively determine the native or non-native status of these slugs, and in their native ranges Meghimatium species may even be considered conservation targets. Additionally, taxonomic challenges further complicate this issue. Thus, comprehensive genetic and taxonomic studies encompassing genome-wide information are essential to enhance our understanding of these 2 invasive slugs.