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Eustigmatophyte
Nannochloropsis sp.
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Clade:	SAR
Clade:	Stramenopiles
Phylum:	Gyrista
Subphylum:	Ochrophytina
Superclass:	Limnistia
Class:	Eustigmatophyceae Hibberd & Leedale, 1971
Order
Eustigmatales Goniochloridales

Eustigmatophytes are a small group (17 genera; ~107 species) of eukaryotic forms of 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
      • 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 - 16 spp.
    • Family Monodopsidaceae Hibberd 1981
      • 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

1. Hoek, C. van den; Mann, D.G.; Jahns, H.M. (1995). Algae : An introduction to phycology. Cambridge University Press. ISBN 978-0521316873.
2. Guiry, M.D.; Guiry, G.M. (2016). "Eustigmatales". AlgaeBase. National University of Ireland, Galway.
3. Hoek, Mann & Jahns 1995, p. 131
4. Hegewald, E.; Padisák, J.; Friedl, T. (2007). "Pseudotetraëdriella kamillae: taxonomy and ecology of a new member of the algal class Eustigmatophyceae (Stramenopiles)". Hydrobiologia. 586 (1): 107–116. doi:10.1007/s10750-006-0566-5. S2CID 37483551.
5. Amaral, R.; Fawley, K.P.; Němcová, Y.; Ševčíková, T.; Lukešová, A.; Fawley, M.W.; Santos, L.M.A.; Eliáš, M. (2020). "Toward Modern Classification of Eustigmatophytes, Including the Description of Neomonodaceae Fam. Nov. and Three New Genera". Journal of Phycology. 56 (3): 630–648. Bibcode:2020JPcgy..56..630A. doi:10.1111/jpy.12980. PMC 7987219. PMID 32068883.

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