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Trachelomonas (track-ell-owe-moan-ass) is an autotrophic euglenid flagellate. The genus is distinguished from others because the cells live within a loose fitting lorica with a small opening. The lorica of many species is elaborated with spikes or spines. The lorica accumulates metal salts with age, becoming brown and brittle and often obscuring the bright green colour of the chloroplasts within the cell. Red eyespot evident as dark region near the anterior of the cell. There is one emergent flagellum which emerges from the opening of the lorica. After division of the daughter cells will emerge from the opening of the lorica. Most freshwater but occasionally found in brackish habitats. Phase contrast.
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Portrait of the colorless euglenoid flagellate, Menoidium bibacillatum (Pringsheim, 1942). Strongly flattened. One side curved with the other more straight. One emergent flagellum. Stigma absent. Paramylon bodies are dimorphic with smaller round and larger elongate ring forms. Swims rotating on long axis. Highly refractile. From standing freshwater near Boise, Idaho. DIC.
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Euglena mutabilis (you-glean-a mew-tab-ill-iss), is a moderately long but usually thin worm-like euglena. It may or may not have an emerging flagellum, and distinguished from similarly-shaped species by the relatively small number of large chloroplasts. The image also shows (from anterior - top): flagellar pocket, stigma or eyespot, small paramylon granules, and nucleus in the middle of the cell. Typically very metabolic - squirming a lot as is suggested by the different profiles in this image. Differential interference contrast.
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Euglena ehrenbergii. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. This work was supported by the Australian Biological Resources Study.
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Ribadelago, Castille and Leon, Spain
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Ribadelago, Castille and Leon, Spain
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Cabanas De Sayago, Castille and Leon, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Sobrado, Galicia, Spain
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Luanco, Asturias, Spain
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Moral de Sayago, Castille and Leon, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Canencia, Comunidad de Madrid, Espaa
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Melgar de Tera, Castille and Leon, Spain
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Amer, La Rioja, Spain
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Logrono, La Rioja, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Madrid, Madrid, Spain
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Mahide, Castille and Leon, Spain
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Vitoria, Basque Country, Spain
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Madrid, Madrid, Spain
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Ribadelago, Castille and Leon, Spain
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Alforja, Catalonia, Spain