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Medlin and co-workers erected a new class, Mediophyceae (which could be re-ranked a subclass if diatoms as a whole are ranked as a class rather than a phylum) for the "polar centric" diatoms, which they consider to be more closely related to the pennate rather than to other centric diatoms, a concept which has been followed or further adapted ...
Since diatoms form an important part of the food of molluscs, tunicates, and fishes, the alimentary tracts of these animals often yield forms that are not easily secured in other ways. Diatoms can be made to emerge by filling a jar with water and mud, wrapping it in black paper and letting direct sunlight fall on the surface of the water.
Dead diatoms drift to the ocean floor where, over millions of years, the remains of their frustules can build up as much as half a mile deep. [64] Diatoms have relatively high sinking speeds compared with other phytoplankton groups, and they account for about 40% of particulate carbon exported to ocean depths. [60] [65] [62]
Diatoms are eukaryotic organisms in the phylum Bacillariophyta. This page contains articles about diatoms and diatomists.. Older classifications used to subdivide diatoms into Centrales and Pennales (with Bacillariophyceae used as a class), whereas more recent ones use a three classes system: Bacillariophyceae, Coscinodiscophyceae and Fragilariophyceae.
As with all diatoms, the siliceous cell wall consists of two interlocking components ("like two halves of a petri dish" [24]), the hypotheca and the epitheca. [25] Each cell is approximately 8 to 12 μm in diameter [5] and about 3.5 to 11.5 μm apart from each other.
Diatoms form a (disputed) phylum containing about 100,000 recognised species of mainly unicellular algae. Diatoms generate about 20 per cent of the oxygen produced on the planet each year, [ 93 ] take in over 6.7 billion metric tons of silicon each year from the waters in which they live, [ 159 ] and contribute nearly half of the organic ...
Diatoma is a genus of diatoms belonging to the family Fragilariaceae. [1] The genus has cosmopolitan distribution. [1] Species: [1] Diatoma angusticostata D.M.Williams & Z.Levkov, 2006; Diatoma arcuatum Lyngbye, 1818; Diatoma auritum Lyngbye, 1819; Diatoma elongata
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