Heteronematales is an order of biota. There are 142 species of Heteronematales, in 13 genera and 3 families. It includes groups like Heteronematidae, Lentomonadidae, and Peranemidae.
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)