Pandorina
| Pandorina | ||||||||||||
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Pandorina Colony |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Pandorina | ||||||||||||
| Bory de Saint-Vincent , 1824 |
Pandorina is an algae - genus from the class of Chlorophyceae with about 15 species .
description
Pandorina forms approximately spherical colonies of 8 or 16, more rarely 32 single cells, which are closely attached in the center and widened towards the front end . The colonies are held together by a colorless gel. The cells are bifurcated , have two contractile vacuoles and large, cup-shaped chloroplasts . The anterior cells' eye spots in the colony are often larger than those of the posterior. The colonies reach a size of 20 to 40, rarely up to 250 µm, the cells reach a size of eight to 17 µm.
Reproduction
Asexual reproduction takes place in the following way: after three to five cell divisions, each cell in a colony forms a daughter colony within the jelly of the mother colony.
The sexual reproduction is done by isogamy or anisogamy . The gametes fuse to form a zygote with a thick, smooth cell wall that is colored orange-red. After a reduction division, the zygote releases one or two flagellated cells, each of which forms a new colony. In Pandorina is a haploid .
distribution
Pandorina lives planktonically in stagnant and weakly flowing waters.
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 .
- Heinz Streble , Dieter Krauter : Life in a drop of water. Microflora and microfauna of freshwater. An identification book. 10th edition. Kosmos, Stuttgart 2006, ISBN 3-440-10807-4 .
Web links
- Pandorina at algaebase.org
- Images of Pandorina morum