Eunotia
| Eunotia | ||||||||||||
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Eunotia sp. |
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| Scientific name | ||||||||||||
| Eunotia | ||||||||||||
| Ehrenberg |
Eunotia (from the Greek eunotos with a strong back) is a genus of diatoms (Bacillariophyta) with around 100 species that occur in freshwater.
features
Eunotia is a unicellular diatom that has long, curved shells. At the ends they are sometimes curved back. The individual cells have the typical diatom shell consisting of two counters. The bowls are rectangular in side view. In the shell view , only short raphenous branches can be seen at the cell ends . The nucleus sits in the middle of the cell, the two long, plate-shaped plastids lie under the two shells. They are colored golden brown by fucoxanthin . In some cases, multiple cells form loose colonies or stick to the substrate with jelly. The cells are 10 to 220 micrometers long.
Asexual reproduction occurs through the typical division of diatoms into two parts, which leads to the reduction of the cells. Sexual reproduction occurs through isogamy or anisogamy , with one gamete being formed per cell . The cells then enlarge during the auxospore formation.
Occurrence
Eunotia grows on plants or on sediments. It occurs mainly in oligotrophic, weakly to strongly acidic waters. It can also be found in springs and rivers.
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. 216.