Ceratium longirostrum is a species of in the family Ceratiaceae. They are native to Rio Grande Do Sul, Rio De Janeiro, SãO Paulo, Espirito Santo, Pernambuco, Rio Grande Do Norte, and Bahia.
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).