Abstract

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.

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