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Published online by Cambridge University Press: 01 December 2025
The mudskipper Boleophthalmus dussumieri (Teleostei, Gobiiformes, Oxudercidae) is an amphibious goby native to the Indian Ocean, from Kuwait Bay and Persian Gulf to the northeast of the Arabian Sea and the western coast of India. This study reports on the first record of B. dussumieri in the Atlantic Ocean, based on morphological and molecular evidence. A single specimen was collected in September 2024 in São Marcos Bay, on the coast of the state of Maranhão (Brazilian Amazon Coast). This is the second exotic species of oxudercid goby reported for the coast of Maranhão, possibly accidentally introduced through ballast water discharge.