Dispersal ability can affect levels of gene flow thereby shaping species distributions and richness patterns. We focused on the long-jawed spiders (Tetragnatha) and investigated how their dispersal ability may have shaped their biogeographic history in the Caribbean archipelago. We used time calibrated molecular phylogenies and biogeographic analyses of 54 species to reveal multiple independent origins of Caribbean long-jawed spiders. We concluded that among arachnids,Tetragnatha uniquely comprises both excellent and poorly dispersing species and named such taxon a "dynamic disperser".
