Identification of dinoflagellates to specific level is sometimes arduous due to high diversity and frequent morphological variability. Focusing on Neoceratium genus, often used as ecological indicator, our collaborative web site provides to scientists an accessible and detailed taxonomic tool, allowing accurate identification of its numerous species and varieties. This original web site offers the possibility to visualize several taxa to avoid confusion between infraspecific taxa of the same species and between morphologically close taxa, belonging to different species.