Of the known benthic, toxigenic microalgae, species from the genera, Gambierdiscus and Ostreopsis, present the biggest threats to human and environmental health. Gambierdiscus spp. produce gambiertoxins which are precursors of ciguatoxins, the compounds

O. labens sp. nov., is described from three marine habitats: lagoonal water and lagoonal sand from the barrier reef of Belize, and associated with macroalgae from coral reef habitats of Oshigaki and Iriomote Islands, Japan. O. labens was most numerous

The distribution of benthic Ostreopsis species is poorly known in the Moroccan coasts. The current study is aiming to investigate: i) the distribution of Ostreopsis spp. cells on macroalgae and in the seawater column of the Cape Ghir area (North-West