Stramenopile phyla

Pseudofungi is a grouping of heterokonts, also known as the Heterokontimycotina. It consists of the Oomycetes and Hyphochytriomycetes. Although numerous biochemical, ultrastructural, and genetic traits clearly place them in the heterokonts, their growth form (featuring hyphae) and mode of nutrition (osmotrophy) resemble those of fungi (which are not closely related).

Bigyra () is a phylum of microscopic eukaryotes that are found at the base of the Stramenopiles clade. It includes three well-known heterotrophic groups Bicosoecida, Opalinata and Labyrinthulomycetes, as well as several small classes initially discovered through environmental DNA samples: Nanomonadea, Placididea, Opalomonadea and Eogyrea. The classification of Bigyra has changed several times since its origin, and its monophyly remains unresolved.

Placidozoa is a recently defined non-photosynthetic lineage of Stramenopiles.