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Eustigmatophytes are a small group (17 genus; ~107 species) of eukaryote forms of that includes marine, fresh water and soil species.
All eustigmatophytes are unicellular, with coccus cells and polysaccharide cell walls. Eustigmatophytes contain one or more yellow-green , which contain chlorophyll a and the accessory pigments violaxanthin and carotene. Eustigmatophyte () possess a single or pair of flagellum, originating from the apex of the cell. Unlike other , eustigmatophyte zoids do not have typical photoreceptive organelles (or eyespots); instead an orange-red eyespot outside a chloroplast is located at the anterior end of the zoid.
ecology, eustigmatophytes occur as photosynthesis across a range of systems. Most eustigmatophyte genera live in freshwater or in soil, although Nannochloropsis contains marine species of picophytoplankton (2–4 Micrometre).
The class was erected to include some algae previously classified in the Xanthophyceae.
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