Trebouxiophyceae
| Trebouxiophyceae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Trebouxiophyceae | ||||||||||||
| Friedl |
The Trebouxiophyceae are a class of algae that belongs to the group of Chlorophyta , one of the two large groups of green algae .
features
The representatives are flagellated or not flagellated single-cell organisms, as well as branched and unbranched filamentous forms.
The floating cells have one or two pairs of flagella without mastigonema . The basal bodies have four microtubule roots in a cruciform arrangement, including a multilayered structure and a smaller root. The basal bodies have a distinct rhizoplast . The whole flagellar apparatus is arranged counterclockwise. The mitosis is closed with a metacentric mitotic spindle; half-closed mitosis also occurs. The cells divide by means of Phycoplast .
Asexual reproduction occurs via autospores or zoospores . Sexual reproduction has been observed. Nutrition occurs through autotrophy ( photosynthesis ) or osmotrophy . Prototheca , a coccal form, has secondarily lost the ability to photosynthesize.
Occurrence
The representatives of the group live freely or form lichen . They occur in both fresh and sea water, some representatives also live terrestrially .
Systematics
This class is likely to be monophyletic , but this has not yet been sufficiently verified. The individual orders should also be monophyletic:
- Trebouxiales : these are mainly lichen-forming forms that form zoospores. Representatives are Trebouxia , Myrmecia .
- Microthamniales : zoospore-forming unicellular to branched threads. Microthamnion , Fusochloris
- Prasiolales : form zoospores; Single-cell to leaf-like thalli . Widely used in freshwater, marine, and terrestrial. Some representatives live in cold deserts such as Pabia signiensis in Antarctica . Example: Prasiola , Stichococcus .
-
Chlorellales : form car pores.
- Family Chlorellaceae : u. a. Chlorella
- Family Oocystaceae
literature
- Sina M. Adl, Alastair GB Simpson, Mark A. Farmer, Robert A. Andersen, O. Roger Anderson, John A. Barta, Samual S. Bowser, Guy Bragerolle, Robert A. Fensome, Suzanne Fredericq, Timothy Y. James, Sergei Karpov, Paul Kugrens, John Krug, Christopher E. Lane, Louise A. Lewis, Jean Lodge, Denis H. Lynn, David G. Mann, Richard M. McCourt, Leonel Mendoza, Øjvind Moestrup, Sharon E. Mozley-Standridge, Thomas A. Nerad, Carol A. Shearer, Alexey V. Smirnov, Frederick W. Spiegel, Max FJR Taylor: The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists. In: The Journal of Eukaryotic Microbiology. 52 (5), 2005; Pages 399-451. doi : 10.1111 / j.1550-7408.2005.00053.x .
Individual evidence
- ^ Louise A. Lewis, Richard M. McCourt: Green Algae and the origin of land plants : American Journal of Botany 91 (10), 2004, pages 1535-1556. Abstract and full text
