For the tirst time, ten desmid species from the Colombia n Amazonian basin are recorded. The genera encountered are Gonatozygon, Actinotaenium, Cosmarium and Micrasterias. Micrasterias radians, M.laticeps varo acuminata, Actinotaenium cucurbitinum varo cucurbitinum fo. minus and Cosmarium undulatum varominutum are recorded for the first time from Colombia. Gonatozygon monotaenium varo minutum is registered for the first time in South America.
