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Thirty five species of brown seaweeds (Phaeophyta) were found at 72 sites around the Yucatán peninsula. Dictyota menstrualis, Lobophora variegata, and Dictyota pulchella were the most common species. Seven new records were registered for the three states comprising the Yucatán peninsula: Hincksia sandriana in Quintana Roo; Hydroclathrus clathratus, Dictyopteris delicatula, Dictyota menstrualis, and D. mertensii in Campeche; and Hincksia mitchelliae, Ectocarpus rallsiae, and Sargassum cymosum in Yucatán. Twenty-eight species not found in this study but reported by other authors were included. Twenty one percent of the species were not distributed on both the Caribbean (Eastern Quintana Roo) and the Gulf of Mexico (Northwestern Quintana Roo, Yucatán and Campeche) coastlines of the peninsula. However, species richness was similar on both coastlines of the peninsula (58 vs 54 species, respectively). The northeastern tip of the peninsula (Cabo Catoche) is suggested as the coastal boundary between the Caribbean and the Gulf of Mexico phycoflora of the Yucatán peninsula. Inglés

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