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<i>Ostreopsis</i> cf. <i>ovata</i> is a toxic marine benthic dinoflagellate responsible for harmful blooms affecting ecosystem and human health, mostly in the Mediterranean Sea. In this study we report the occurrence of a summer <i>O.</i> cf. <i>ovata</i> bloom in Currais, a coastal archipelago located on the subtropical Brazilian coast (~25&#176; S). This bloom was very similar to Mediterranean episodes in many aspects: (a) field-sampled and cultivated <i>O.</i> cf. <i>ovata</i> cells aligned phylogenetically (ITS and LSU regions) along with Mediterranean strains; (b) the bloom occurred at increasing temperature and irradiance, and decreasing wind speed; (c) cell densities reached up to 8.0 &#215; 10⁴ cell cm^&#8722;2 on fiberglass screen and 5.6 &#215; 10⁵ cell g^&#8722;1 fresh weight on seaweeds; (d) and toxin profiles were composed mostly of ovatoxin-a (58%) and ovatoxin-b (32%), up to 35.5 pg PLTX-eq. cell^&#8722;1 in total. Mussels were contaminated during the bloom with unsafe toxin levels (up to 131 &#181;g PLTX-eq. kg^&#8722;1). <i>Ostreopsis</i> cells attached to different plastic litter, indicating an alternate route for toxin transfer to marine fauna via ingestion of biofilm-coated plastic debris.