First record of Magelonidae, magelona riojai Jones, 1963 (Polychaeta) in coastal waters of Argentina

Resumen

Magelona riojai Jones, 1963 (Magelonidae) is reported for the first time in Argentine waters. The specimens were collected during a benthic sampling program developed in Mar del Plata city coastal area (38°S), aimed at determining the structure of subtidal soft-bottom macrobenthic communities and their relationship to sewage effluent. This is also the first report of the family in Argentina, and extends its southern range of distribution from 30° to 38°S. The specimens were recorded in sandy bottoms with low organic content, between 6.5 to 12.5 m depth, in front of a sewage effluent of Mar del Plata city.