Eustigmatophyte
| Eustigmatophytes | |
|---|---|
 |
|
| Nannochloropsis sp. | |
| Scientific classification | |
| Domain: | |
| (unranked): | |
| Phylum: | |
| Class: |
Eustigmatophyceae
Hibberd & Leedale, 1971
|
| Order: |
Eustigmatales
Hibberd, 1981
|
| families | |
|
Eustigmataceae |
|
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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]
See also
- Eustigmatos
- Pseudostaurastrum
- Vischeria
- Nannochloropsis
References
- ↑ 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.
- ↑ 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.
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