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Species of Euglena were among the first protists to be seen under the microscope. In 1674, in a letter to the Royal Society, the Dutch pioneer of microscopy Antonie van Leeuwenhoek wrote that he had collected water samples from an inland lake, in which he found "animalcules" that were "green in the middle, and before and behind white."
Euglena gracilis is a freshwater species of single-celled alga in the genus Euglena. It has secondary chloroplasts , and is a mixotroph able to feed by photosynthesis or phagocytosis . It has a highly flexible cell surface, allowing it to change shape from a thin cell up to 100 μm long to a sphere of approximately 20 μm.
Several genera assigned to Euglenophyceae are considered incertae sedis, because the lack of genetic data makes their phylogenetic position unresolved: [3] Ascoglena Stein, 1878 – 4 spp. Euglenamorpha Wenrich, 1924 – 2 spp. Euglenopsis Klebs, 1892 – 11 spp. Glenoclosterium Carter, 1869 – 1 sp. Hegneria Brumpt & Lavier, 1924 – 1 sp.
The phagotrophs, although paraphyletic, have historically been classified under the name of Heteronematina. [9] In addition, euglenids can be divided into inflexible or rigid euglenids, and flexible or metabolic euglenids which are capable of 'metaboly' or 'euglenid motion'. Only those with more than 18 protein strips in their pellicle gain ...
The fossil record for Phacus, like most euglenoids, is very scarce, and little information is actually known of their geographical origins. However, there have been reports that Phacus-like microfossils have been discovered from pyriform cells, which seem to closely resemble that of Phacus or another closely related genus, Lepocinclis. These ...
By Keith Morrison Taking the phrase of "putting it under the microscope" quite literally, the Nikon Small World contest recently announced its winners for 2014. Now in its 40th year, the contest ...
Euglena viridis is a freshwater, single cell, mixotroph microalgae bearing a secondary chloroplast. [1] Their chloroplast is bounded by three layers of membrane without a nucleomorph . [ 2 ] Normally, it is 40–65 μm long, slightly bigger than other well-known Euglena species: Euglena gracilis .
The answers provided by Tulsi Gabbard, Donald Trump’s pick for director of national intelligence, before the Senate Intelligence Committee on Thursday may make it the most consequential hearing ...