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Before the centric diatom begins to expand, its nucleus is at the center of one of the valves and begins to move towards the center of the cytoplasmic layer before division is complete. Centric diatoms have a variety of shapes and sizes, depending on from which axis the shell extends, and if spines are present.
Bacterial motility is the ability of bacteria to move independently using metabolic energy. Most motility mechanisms that evolved among bacteria also evolved in parallel among the archaea. Most rod-shaped bacteria can move using their own power, which allows colonization of new environments and discovery of new resources for survival.
Bacterial gliding is a process of motility whereby a bacterium can move under its own power. Generally, the process occurs whereby the bacterium moves along a surface in the general direction of its long axis. [5] Gliding may occur via distinctly different mechanisms, depending on the type of bacterium.
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]
move to sidebar hide Attheya ... "Phylogenetic Position Of Attheya Longicornis and Attheya Septenrionalis (Bacillariophyta)". Journal of Phycology. 45 (2): ...
Bacillaria paxillifer was originally described under the name Vibrio paxillifer by Otto Frederick Müller in 1786. It is the first diatom species known to be described. [5] It was separately described two years later (1788) by Johann Friedrich Gmelin as Bacillaria paradoxa.
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Kooistra, Wiebe HCF, et al. "Global diversity and biogeography of Skeletonema species (Bacillariophyta)." Protist 159.2 (2008): 177–193. Alverson, Andrew J., and Leanne Kolnick. "Intragenomic nucleotide polymorphism among small subunit (18s) rDNA paralogs in the diatom genus skeletonema (bacillariophyta) 1."