Amphora (genus)
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Amphora is a genus of diatoms (Bacillariophyta) with around 150 species, most of which occur in the sea and only a few in freshwater.
features
Amphora is a unicellular, oval diatom. The individual cells have the typical diatom shell consisting of two counters. The shells are not symmetrical, however, but rather enlarged and strongly curved on one side. This enlarged side is called the dorsal. The other side is reduced in size and not very curved. The raphe can therefore only be seen on the ventral side. In the cell there is a single, large, H-shaped plastid on the dorsal side. It has a central pyrenoid , four lobes and is colored golden brown by fucoxanthin . The cells are 5 to 105 micrometers long.
Asexual reproduction occurs through the typical dichotomy of diatoms. Sexual reproduction occurs through isogamy , automixis also occurs. The cells then enlarge during the auxospore formation.
Occurrence
Amphora occurs mainly in the sea. It is also common in brackish water and in oligo- to eutrophic fresh water.
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. 204.