Heterotrichida is an order of ciliates. There are 306 species of Heterotrichida, in 56 genera and 10 families. It includes groups like Fabreidae, Climacostomidae, and Peritromidae.
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)