The rocky shores of Mar del Plata in Argentina are home to a diverse community of mussels, with Brachidontes rodriguezii being the dominant species. These mussels form dense beds on the mid and upper intertidal substrates, with the highest densities found on vertical protected surfaces. The mussel beds support a variety of other species, including algae and the pulmonate limpet Siphonaria lessoni. An invasive barnacle species, Balanus glandula, was first observed in the area in 1974 and now forms a fringe in the upper intertidal zone. The unique characteristics of the Mar del Plata rocky shore community make it an interesting area for further study using NAGISA protocols.