The Jamaican freshwater crab Sesarma fossarum (Decapoda: Brachyura: Sesarmidae) is endemic to western central Jamaica where it occurs in cave and surface streams of karst regions. In the present study. we examine the population genetic structure of the species. providing evidence for intraspecific differentiation and genetic substructure among twelve sampled populations. https://thecookiecountesses.shop/product-category/keyring/