Two gastropods associated with floating objects from the Uruguayan coast

The gastropods Litiopa melanostoma (Rang, 1829) (Caenogastropoda: Litiopidae) and Fiona pinnata (Eschoscholtz, 1831) (Nudibranchia: Fionidae) are recorded for the first time from Uruguayan waters based on material collected in the coast of Rocha. This is the southernmost record for these species in the Western Atlantic Ocean, and the first one of Fiona pinnata from the Atlantic South American coast.Original Abstract: Los gasteropodos Litiopa melanostoma (Rang, 1829) (Caenogastropoda: Litiopidae) y Fiona pinnata (Eschoscholtz, 1831) (Nudibranchia: Fionidae) son registrados por primera vez para aguas uruguayas, en base al material colectado en la costa de Rocha. Este es el registro mas austral para esas especies en el Atlantico Occidental, y el primero de Fiona pinnata para la costa atlantica sudamericana.