The lorica consists of spirally arranged microfibrillar bundles. The microfibrils are thought to contain chitin.

As with most other stramenopiles, the anterior flagellum bears two rows of tripartite tubular hairs. The presence of lateral filaments, made up of polysaccharides, on the hair shaft helps place Poterioochromonas among the chrysophytes.

The cells are uninucleate. There is a single Golgi body anterior to the nucleus and near theflagellar bases. Mitochondrial cristae are tubular.

The cytoskeleton is based on an asymmetrical system of two flagellar bases, four microtubular roots, and a rhizoplast. The two microtubular roots that are associated with the posterior basal body form the feeding basket.

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