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Eustigmatophytes are a small group (17 genera; ~107 species) of eukaryotic algae that includes marine, freshwater and soil-living species. All eustigmatophytes are unicellular, with coccoid cells and polysaccharide cell walls. Eustigmatophytes contain one or more yellow-green chloroplasts, which contain chlorophyll a and the accessory pigments violaxanthin and β-carotene. Eustigmatophyte zoids (gametes) possess a single or pair of flagella, originating from the apex of the cell. Unlike other heterokontophytes, 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. Ecologically, eustigmatophytes occur as photosynthetic autotrophs across a range of systems. Most eustigmatophyte genera live in freshwater or in soil, although ''Nannochloropsis'' contains marine species of picophytoplankton (2–4 μm). The class was erected to include some algae previously classified in the Xanthophyceae.

Classification

* Class Eustigmatophyceae Hibberd & Leedale 1970 ** Order Eustigmatales Hibberd 1981 *** Genus ''Paraeustigmatos'' Fawley, Nemcová, & Fawley 2019 *** Family Eustigmataceae Hibberd 1981 hlorobothryaceae Pascher 1925; Pseudocharaciopsidaceae Lee & Bold ex Hibberd 1981**** Genus ?''Ellipsoidion'' Pascher 1937 **** Genus ''Chlorobotrys'' Bohlin 1901 **** Genus ''Eustigmatos'' Hibberd 1981 **** Genus ''Pseudocharaciopsis'' Lee & Bold 1973 **** Genus ''Pseudostaurastrum'' Chodat 1921 **** Genus ''Vischeria'' Pascher 1938 *** Family Monodopsidaceae Hibberd 1981 oboceae Hegewald 2007**** Genus ''Microchloropsis'' Fawley, Jameson & Fawley 2015 **** Genus ''Monodopsis'' Hibberd 1981 **** Genus ''Nannochloropsis'' Hibberd 1981 **** Genus ''Pseudotetraedriella'' Hegewald & Padisák 2007 *** Family Neomonodaceae Amaral et al. 2020 **** Genus ?''Botryochloropsis'' Preisig & Wilhelm 1989 **** Genus ''Characiopsiella'' Amaral et al. 2020 **** Genus ''Munda'' Amaral et al. 2020 **** Genus ''Neomonodus'' Amaral et al. 2020 **** Genus ''Pseudellipsoidion'' Neustupa & Nemková 2001 ** Order Goniochloridales Fawley, Elias & Fawley 2013 *** Family Goniochloridaceae **** Genus ''Goniochloris'' Geitler 1928 **** Genus ''Pseudostaurastrum'' Chodat 1921 **** Genus ''Tetraedriella'' Pascher 1930 **** Genus ''Trachydiscus'' H.Ettl 1964 **** Genus ''Vacuoliviride'' Nakayama et al. 2015

Phylogeny

Phylogeny of Eustigmatophyceae based on the work of Amaral et al 2020

References

Category:Ochrophyta Category:Heterokont classes Category:Algae classes {{Heterokont-stub