摘要：A new species of amphipod belonging to the family Ampithoidae was collected from Cenote Aerolito, Cozumel Island, Quintana Roo associated with a macroalgae bed. The main differences between the new species and the previously recorded species in the Gulf of Mexico and Caribbean Sea, Cymadusa compta and Cymadusa setosa respectively, are also presented. The new species increases the globally described number of Cymadusa species to 33.
