Eustigmatophyte

Eustigmatophytes

Nannochloropsis sp.
Scientific classification
Domain:	Eukaryota
(unranked):	Sar
Phylum:	Heterokontophyta
Class:	Eustigmatophyceae Hibberd & Leedale, 1971
Order:	Eustigmatales Hibberd, 1981
families
Eustigmataceae Loboceae^[1] Monodopsidaceae Pseudocharaciopsidaceae

Eustigmatophytes are a small group (7 genera; ~12 species) of eukaryotic algae that includes marine, freshwater and soil-living species.^[2] 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.^[3]

References

^ : taxonomy and ecology of a new member of the algal class Eustigmatophyceae (Stramenopiles). Hydrobiologia 586 (1): 107—116.Pseudotetraëdriella kamillaeHegewald E., Padisák J., Friedl T. 2007.
^ Hoek, C. van den, Mann, D. G. and Jahns, H. M. (1995). Algae : An introduction to phycology, Cambridge University Press, UK.
^ Hoek, C. van den et al., p. 131.

Plankton

About plankton

By size

Bacterioplankton

Phytoplankton

Auxospore Axodine Chaetoceros Chaetocerotaceae Coccolithophore Emiliania huxleyi Eustigmatophyte Frustule Heterokont Nannochloropsis Navicula Prasinophyceae Raphidophyte Thalassiosira pseudonana

Diatom orders	Centrales Pennales (Classes: Coscinodiscophyceae Fragilariophyceae Bacillariophyceae)

Flagellates

Zooplankton

Chaetognatha Ciguatera Ctenophora Gelatinous zooplankton Hunting copepods Ichthyoplankton Jellyfish Marine larvae Crustacean larvae Salmon louse Sea louse

Copepod orders	Calanoida Cyclopoida Harpacticoida Monstrilloida Poecilostomatoida Siphonostomatoida More...

Related topics

Eukaryota: SAR: Heterokonta or Stramenopiles

Domain
(Kingdom: )

Ochrophyta
(photosynthetic)

Phaeista

Hypogyristea

Chrysista

Chrysophyceae, golden algae	Chromulinales Chrysosphaerales Hibberdiales Hydrurales Phaeothamniales

Eustigmatophyceae	Eustigmataceae Monodopsidaceae Pseudocharaciopsidaceae

Phaeophyceae, brown algae	Ascoseirales Cutleriales Desmarestiales Dictyotales Discosporangiales Ectocarpales Fucales Ishigeales Laminariales Nemodermatales Onslowiales Ralfsiales Scytosiphonales Scytothamnales Sphacelariales Sporochnales Syringodermatales Tilopteridales

Phaeothamniophyceae	Phaeothamniales Pleurochloridellales

Raphidophyceae	Chattonella, Fibrocapsa, Gonyostomum, Haramonas, Heterosigma, Vacuolaria

Synurophyceae	Heterogloeales Ochromonadales Rhizochloridales Synurales

Xanthophyceae, yellow-green algae	Botrydiales Mischococcales Tribonematales Vaucheriales

Khakista

Bolidophyceae

Bolidomonas

Bacillariophyta,
diatoms

Coscinodiscophyceae	Biddulphiophycidae Chaetocerotophycidae Corethrophycidae Coscinodiscophycidae Cymatosirophycidae Lithodesmiophycidae Rhizosoleniophycidae Thalassiosirophycidae

Bacillariophyceae	Bacillariales Naviculales

Fragilariophyceae	Fragilariales

Heterotrophic
groups

Pseudofungi

Bigyra

Sagenista	Bicosoecea Labyrinthulomycetes

Opalinata/Slopalinida	Opalinidae Proteromonadidae Blastocystis

Categories

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Eustigmatophyte