Eustigmatophyte
| Eustigmatophytes | |
|---|---|
 | |
| Nannochloropsis sp. | |
| Scientific classification | |
| Domain: | Eukaryota |
| (unranked): | SAR |
| (unranked): | Halvaria |
| Superphylum: | Heterokonta |
| Division: | Ochrophyta |
| Class: | Eustigmatophyceae Hibberd & Leedale, 1971 |
| Order | |
Eustigmatophytes are a small group (12 genera; ~41 species) of eukaryotic algae that includes marine, freshwater and soil-living species.[1][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]
Classification
- Class Eustigmatophyceae Hibberd & Leedale 1970
- Order Eustigmatales Hibberd 1981
- Family Loboceae Hegewald 2007[4]
- Genus Pseudotetraëdriella Hegewald & Padisák 2007
- Family Chlorobothryaceae Pascher 1925
- Genus Chlorobotrys Bohlin 1901
- Family Monodopsidaceae Hibberd 1981
- Genus Microchloropsis Fawley, Jameson & Fawley 2015
- Genus Monodopsis Hibberd 1981
- Genus Nannochloropsis Hibberd 1981
- Family Pseudocharaciopsidaceae Lee & Bold ex Hibberd 1981
- Genus Botryochloropsis Preisig & Wilhelm 1989
- Genus Pseudocharaciopsis Lee & Bold 1973
- Genus Ellipsoidion Pascher 1937
- Family Eustigmataceae Hibberd 1981
- Genus Pseudellipsoidion Neustupa & Nemková 2001
- Genus Pseudostaurastrum Chodat 1921
- Genus Eustigmatos Hibberd 1981
- Genus Vischeria Pascher 1938
- Family Loboceae Hegewald 2007[4]
- Order Eustigmatales Hibberd 1981
References
- ↑ Hoek, C. van den; Mann, D.G.; Jahns, H.M. (1995). Algae : An introduction to phycology. Cambridge University Press. ISBN 978-0521316873.
- ↑ Guiry, M.D.; Guiry, G.M. (2016). "Eustigmatales". AlgaeBase. National University of Ireland, Galway.
- ↑ Hoek, Mann & Jahns 1995, p. 131
- ↑ 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.