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The contiguous United States ( CONUS ) harbor a significant non-native species diversity. However, spatiotemporal trends of some groups such as terrestrial gastropods (i.e., land snails and slugs) have not been comprehensively considered, and therefore management has been hindered. Here, our aims were to 1.) compile a dataset of all non-native terrestrial gastropod species with  CONUS  occurrence records, 2.) assess overarching spatiotemporal patterns associated with these records, 3.) describe the continental origin of each species, and 4.) compare climatic associations of each species in their indigenous and introduced  CONUS  ranges. We compiled a georeferenced dataset of 10,097 records for 22 families, 48 genera, and 69 species, with &gt; 70% of records sourced from the citizen science database iNaturalist. The species    Cornu   aspersum    Müller, 1774 was most prevalent with 3,672 records. The majority (&gt; 92%) of records exhibit an indigenous Western European and Mediterranean distribution, with overlap in broad-scale climatic associations between indigenous and  CONUS  ranges. Records are most dense in urban metropolitan areas, with the highest proportion of records and species richness in the state of California. We show increased prevalence of non-native species through time, largely associated with urbanized areas with high human population density. Moreover, we show strong evidence for a role for analogous climates in dictating geographic fate and pervasiveness between indigenous and  CONUS  ranges for non-native species.

Spatiotemporal patterns of non-native terrestrial gastropods in the contiguous United States