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Euglena is a genus of single cell flagellate eukaryotes. It is the best known and most widely studied member of the class Euglenoidea, a diverse group containing some 54 genera and at least 200 species. [1] [2] Species of Euglena are found in fresh water and salt water.
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.
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.
Euglenales consists mostly of freshwater organisms, in contrast to its sister Eutreptiales which is generally marine. Cells have two flagella, but only one is emergent; the other is very short and does not emerge from the cell, so cells appear to have only one flagellum. [3]
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 ...
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 ...
Peranema. Peranema's basic anatomy is that of a typical euglenid.The cell is spindle or cigar-shaped, somewhat pointed at the anterior end. It has a pellicle with parallel finely-ridged proteinaceous strips underlain by microtubules arranged in a helical fashion around the body.
A scanning electron microscope image of a diatom. Unicellular algae are plant-like autotrophs and contain chlorophyll. [44] They include groups that have both multicellular and unicellular species: Euglenophyta, flagellated, mostly unicellular algae that occur often in fresh water. [44]