Tripos arietinus is a species of Dinophyceae in the family Ceratiaceae. They are native to Espirito Santo, Pará, Pernambuco, Bahia, Rio Grande Do Norte, Ceará, and Rio De Janeiro.
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).
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)