Dinobryon
| Dinobryon | ||||||||||||
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Dinobryon divergens , sapling |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Dinobryon | ||||||||||||
| Ehrenberg 1834 |
Dinobryon is a genus of golden brown algae (Chrysophyceae) with around 30 species .
features
The representatives of the genus are single-celled or colonized golden brown algae. The cells have two flagella of different lengths and sit in a funnel-shaped to vase-shaped housing, the lorica . The Lorica is between 15 and 65 µm long. The opening of the lorica points to the point of attachment of the flagella. The cells are attached to the housing with a stem. They contain two sideways, golden-brown plastids that are of different sizes. The nucleus lies between them. One of the plastids has an eye spot . There is a contractile vacuole at the front end of the cell .
The colonies arise because the housings of many cells are connected. The colonies are free swimming. Other species only form single cells that swim freely or sit on the substrate.
Asexual reproduction occurs through longitudinal division. One daughter cell remains in the housing, the other forms a new one. In the case of colony-forming species, this occurs at the mouth of the mother housing. Sexual reproduction occurs through morphological isogamy : the male flagellated cells are chemotactically attracted. The product is a stomatocyst .
Distribution and ecology
Dinobryon is a freshwater alga. It occurs preferentially in the cool season, in spring and autumn. It can be found in slightly acidic, oligotrophic to slightly eutrophic waters. They are stuck or swim freely. Their diet is mixotrophic .
literature
- 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. 110.
