Pleodorina
| Pleodorina | ||||||||||||
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Drawing a pleodorina colony |
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| Scientific name | ||||||||||||
| Pleodorina | ||||||||||||
| W. Shaw , 1894 |
Pleodorina is an algae - genus from the class of Chlorophyceae .
description
Pleodorina forms approximately spherical colonies of mostly 128, rarely 64 or 32 cells with a diameter of 180 to 450 µm. The cells lie in the periphery in a common jelly and are not arranged in rings (levels). The cells have a nucleus , two flagella and a drop-shaped chloroplast with an eye spot . In terms of construction, the cells correspond to those of Chlamydomonas . The cells of an adult colony are clearly of different sizes; the anterior ones are small ( somatic cells ), the posterior two to three times as large (generative cells). Somatic cells have one pyrenoid , generative cells have several.
Reproduction
In asexual reproduction , a generative cell forms a daughter colony within the jelly of the mother colony. Every generative cell is capable of this form of reproduction.
The sexual reproduction is done by oogamy (egg fertilization). Spermatozoids packets are formed in male colonies; an egg cell is created by transforming a generative cell in female colonies.
Types (selection)
distribution
Pleodorina lives planktonically in standing waters.
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
- Pleodorina at algaebase.com
- Images of Pleodorina