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ABSTRACT . Only 15 families of decapod crustaceans living as larvae in oceanic waters of northern Chile survivedthe strong impact of the El Nino 1982-83 event. A key considering only their most conspicuous external characters,without specimens dissection, is given. These families represent one third of the total reported for the area living under“normal” oceanographic conditions; and at the level of species the 22 collected are almost one seventh of their total of150. Species introduced in the area with more septentrional waters belong to the families Penaeidae and Sicyoniidae.Collected larvae were mainly those from intertidal and sublittoral waters. Key words : keys, decapod crustaceans, larvae, El Nino event, Chile. Clave de larvas de crustaceos decapodos recolectadasfrente al norte de Chile durante un fenomeno El Nino 1 RESUMEN . Solo 15 familias de crustaceos decapodos representadas por larvas sobrevivieron la fuerte influencia deEl Nino 1983. Se entrega una clave que considera solo los caracteres externos mas conspicuos de estas larvas, sin ladiseccion de los ejemplares. Estas familias representan un tercio del total que viven en el area bajo condicionesoceanograficas normales. A nivel de especies, las 22 recolectadas constituyen casi la septima parte del total de 150.Las especies introducidas en el area por la influencia de aguas mas septentrionales pertenecen a las familias Penaeidaey Sicyoniidae. Las larvas recolectadas pertenecen principalmente a aguas intermareales y sublitorales.

Key to the families of decapod crustacean larvae collected off northern Chile during an El Niño event¹