Flabellina alternata is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Flabellinidae.Bouchet, P. (2015). Flabellina alternata Ortea & Espinosa, 1998. Accessed through: World Register of Marine Species on 2015-04-27
Distribution This species was described from Morro de Beados, Bahía de Corimba, Angola.
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