Phacus
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Phacus |
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| Dujardin |
Phacus is a genus from the root of the Euglenozoa . It wasdescribedby Félix Dujardin in 1841.
description
Phacus lives as a large, mostly flattened unicellular organism with a rigid, often clearly longitudinally divided cell envelope ( pellicula ). The stripes take place in the longitudinal direction of the cell. At the front end of the cell there is a swimming flagellum, a crown furrow, a bottle-like indentation, the flagellum reservoir with channel and one or more contractile vacuoles . An extraplastid eye spot is usually present. In the middle of the cell there is a large nucleus , in the periphery there are many lens-shaped chloroplasts without pyrenoids . Reserve material is the paramylon to be found outside the chloroplasts , which, in contrast to the starch of the green algae, does not result in a starch reaction with Lugol's solution . Unlike other euglenozoa, Phacus is incapable of metabolic movement.
Reproduction
The asexual reproduction is carried out by slitting the cell begins at the front end, and progresses toward the cell tail end. The cells remain flagellated during cell division.
Sexual reproduction is unknown.
distribution
Phacus lives in all, even in highly nutrient-rich ( hypertrophic ) waters; even in bogs , even under ice sheets in winter.
Types (selection)
swell
- Karl-Heinz Linne von Berg, Michael Melkonian u. a .: The Kosmos algae guide. The most important freshwater algae under the microscope. Kosmos, Stuttgart 2004, ISBN 3-440-09719-6 .
Web links
- Phacus at algaebase.org
- Images of Phacus pyrum