Protoperidinium steinii is a species of Dinophyceae in the family Protoperidiniaceae. They are native to Amapá, Rio De Janeiro, Espirito Santo, Bahia, Pará, SãO Paulo, Rio Grande Do Sul, and Santa Catarina.
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).
