Colonies of the stony coral Mussismilia hispida were collected from islands off shore of São Paulo State, de-calcified, and the polychaetes sorted and identified. Spionids, syllids, and sabellids were the most common families, and among the sabellids, a new species of
Amphicorina was found. Amphicorina schlenzae is described and comparisons with the closest species are given.
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