Rhodomonas
| Rhodomonas | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Rhodomonas | ||||||||||||
| G. Karsten , 1898 | ||||||||||||
Rhodomonas is a genus from the algae group of the Cryptophyceae . It occurs mainly in the sea, some species also in fresh water .
features
The representatives are small unicellular organisms that are less than 20 micrometers in size. Their shape is oblong asymmetrical. They have a nucleus and a plastid that is red to olive in color and is divided into two parts. These two lobes of the plastid are connected by a bridge in which there is a pyrenoid . The two flagella of different lengths start slightly below the front end of the cell and lie in a funnel-shaped area of the throat and furrow area. There are a number of explosive organelles ( ejectosomes ) in the throat . The contractile vacuole is usually located near the anterior end.
Asexual reproduction occurs through a complex form of longitudinal division, in the course of which the polarity of the daughter cells is reversed. Sexual reproduction has not yet been observed in Rhdomonas .
Occurrence
Rhodomonas occurs mainly in the sea. Two species occur in freshwater in Europe. They are rarely found in cold to temperate waters.
supporting documents
- 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 , p. 88.
Web links
- Rhodomonas ( Memento from February 23, 2013 in the Internet Archive )