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Bacillariophyta Engler & Gilg, 1919 [6] ... Today (writing at mid 2020 ... An example of proxies is the use of diatom isotope records of δ13C, ...
For many years the diatoms—treated either as a class (Bacillariophyceae) or a phylum (Bacillariophyta)—were divided into just 2 orders, corresponding to the centric and the pennate diatoms (Centrales and Pennales; alternative names Biddulphiales and Bacillariales, as used e.g. in Lee, 1989). [9]
Three diatom species were sent to the International Space Station, together with the huge (6 mm length) diatoms of Antarctica and the exclusive colonial diatom, Bacillaria paradoxa.
Within the diatoms (Bacillariophyta), harmful effects can be due to physical damage or to toxin production. Centric diatoms like Chaetoceros live as colonial chains of cells with long spines (setae) that can clog fish gills, causing their death.
PSP can be fatal in extreme cases, particularly in immunocompromised individuals; children are known to be more susceptible. [citation needed] Most shellfish can store saxitoxin for several weeks after a harmful algal bloom passes, but some, such as butter clams, can store the toxin for up to two years. [10]
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It may be a single or a divided structure, and may be spread over a substantial portion of the alga. In rockweeds, for example, the lamina is a broad wing of tissue that runs continuously along both sides of a branched midrib. The midrib and lamina together constitute almost all of a rockweed, so that the lamina is spread throughout the alga ...
Fragilaria is a genus of freshwater and saltwater diatoms.It is usually a colonial diatom, forming filaments of cells mechanically joined by protrusions on the face and in the center of their valves.