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SummaryThe Yellow-blotched Sawback, Graptemys flavimaculata (Family Emydidae), is a small to medium-sized riverine species endemic to the Pascagoula River drainage of southeast Mississippi, USA. Sexual dimorphism is pronounced, with adult females attaining more than twice the length and ten times the mass of adult males. Although the species is locally abundant, populations are threatened by habitat destruction, collection for the pet trade, invasive species, water quality degradataion, and other human impacts. Previously listed as Endangered on the IUCN Red List, the species has recently been downlisted to Vulnerable due to improved population estimates, newly discovered localities, and improved water qualities leading to some recovered populations. It remains Threatened because of its small range, large number of potential threats, and moderately severe declines in the largest population.