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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.
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.
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.
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]
Eukaryotic photoautotrophs absorb photonic energy through the photopigment chlorophyll (a porphyrin derivative) in their endosymbiont chloroplasts, while prokaryotic photoautotrophs use chlorophylls and bacteriochlorophylls present in free-floating cytoplasmic thylakoids or, in rare cases, membrane-bound retinal derivatives such as ...
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 .
In addition, marine protists occupy key positions in the tree of life, including as the closest relatives of metazoans [animals]... Unicellular eukaryotes are often lumped as 'protists', a term that is useful despite its taxonomic irrelevance and origin as a definition by exclusion—a protist being any eukaryote that's not a plant, animal, or ...
Representative genera (examples) Description Discoba or JEH or Eozoa: Tsukubea: Tsukubamonas: Euglenozoa: Euglena, Trypanosoma: Many important parasites, one large group with plastids (chloroplasts) Heterolobosea (Percolozoa) Naegleria, Acrasis: Most alternate between flagellate and amoeboid forms Jakobea: Jakoba, Reclinomonas