Ankistrodesmus falcatus is a species of . They are native to Roraima, Santa Catarina, Paraná, Minas Gerais, Rio De Janeiro, SãO Paulo, AmazôNia, and Espirito Santo.
Definition: Living in the fluid medium (water or air) but unable to maintain their position or distribution independently of the movement of the water/air mass (adapted from Lincoln et al., 1998).