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First record of Apocorophium acutum (Chevreux, 1908) (Amphipoda, Corophiidae, Corophiinae) from Uruguay, with notes on the biology and distribution

The amphipod Apocorophium acutum (Chevreux, 1908) has a worldwide distribution due to dispersion by ballast water and the hulls of ships. Here we provide a record of this species from Rocha department, Uruguay, which is the first record in the Atlantic South American coast. This record is 5,400 km from the nearest previously known record in Venezuela. Images and morphological characteristics are provided to distinguish from other species of Corophiidae previously recorded in the country.