Hyphochytriomycetes is a class of heterokont. There are 26 species of Hyphochytriomycetes, in 6 genera and 2 families. It includes groups like Rhizidiomycetaceae and Hyphochytriaceae.
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)