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Later, various biologists described additional characteristics for Euglena and established different classification systems for euglenids based on nutrition modes, the presence and number of flagella, and the degree of metaboly.
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.
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.
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Euglena - schéma de structure 1 noyau 2 chloroplastes 3 granules de paramylon (réserve énergétique proche de l'amidon) 4 vacuole contractile (système de régulation osmotique) 5 kinétosome 6 réservoir 7 flagelle court 8 capteur de lumiere (oeil rudimentaire) 9 stigma ("cache" pour le capteur de lumière permettant de connaitre l ...
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Euglenophyceae are mainly present in the water column of freshwater habitats. They are abundant in small eutrophic water bodies of temperate climates, where they are capable of forming blooms, including toxic blooms such as those caused by Euglena sanguinea.
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