Tripos symmetricus is a species of Dinophyceae in the family Ceratiaceae. They are native to SãO Paulo, Amapá, Rio Grande Do Norte, Pernambuco, Santa Catarina, Paraná, and Rio Grande Do Sul.
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).