Prasiolales
Order of algae
From Wikipedia, the free encyclopedia
Prasiolales is an order of green algae in the class Trebouxiophyceae.[2] Members of this order are ecologically widespread and are found in freshwater, marine, and terrestrial habitats from the Arctic to the Antarctic.[3]
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| Prasiolales | |
|---|---|
| |
| Prasiola stipitata | |
Scientific classification  | |
| Kingdom: | Plantae |
| Division: | Chlorophyta |
| Class: | Trebouxiophyceae |
| Order: | Prasiolales F.E.Fritsch |
| Families[1] | |
| |
Morphological features include a single stellate, axial chloroplast with a central pyrenoid.[4] The ultrastructure of Prasiolales is unique and includes cells with four flagella, with their basal flagellar apparatuses in a counterclockwise orientation.[4][5] For a long time, its placement was uncertain and debated between Ulvophyceae and Trebouxiophyceae (also known as Pleurastrophyceae). Molecular data, however, have robustly supported its placement in the latter class.[3]
Traditionally the order contained a single family, Prasiolaceae. Molecular phylogenetics studies have found that coccoid algae of very simple morphology, such as Stichococcus, also belong to this order.[6]
Genera of uncertain placement to family include:[1]
- Edaphochlorella
- Pseudomarvania
Phylogeny
Molecular phylogenetic studies have shown the following relationships (not all genera are included):[7][8][9][10][6]
| Prasiolales |
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Koliellaceae pro parte Stichococcaceae | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
