Euglenales

Phacus (fake-us) is a genus of autotrophic euglenids. It can be distinguished from Euglena by being flattened or twisted and rigid. The most species of the genus are flat and leaf-shaped often with ridges or fins running helically or longitudinally. The chloroplasts are small, discoid and pyrenoids are usually absent. There is a single red eyespot and one locomotive flagellum. Phacus contains conspicuous paramylon bodies, mostly with one ore two large bodies in the centre of the cell. The genus is common in freshwater ecosystems, in muds and associated with detritus. This specimen was collected in freshwater ponds near Konstanz, Germany. Phacus skujai is a small member of the genus. The cells are slender and ovoid. The large paramylon body (often accompanied by a second smaller body) in the mid-cell and the short spine point to the ventral side are said to be distinctive for the species. 28 µm.

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.

Scale bar indicates 10 µm. Sample from the pond Hegne Moor situated in the vicinity of Lake Constance. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA).

Colacium (coal-ace-ee-um) is a euglenid flagellate in which the cells are attached to the substrate b y means of a mucoid stalk. the euglenids are attached to the stalks by their anterior region. The individual cells may break free from the stalks and swim away, at which time they are indistinguishable from members of the genus Euglena. Plastids and eyespots can be discerned in some cells. Phase contrast.

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.

Ribadelago, Castille and Leon, Spain

Ribadelago, Castille and Leon, Spain

Cabanas De Sayago, Castille and Leon, Spain

Ribadelago de Franco, Castille and Leon, Spain

Sobrado, Galicia, Spain

Luanco, Asturias, Spain

Moral de Sayago, Castille and Leon, Spain

Galende, Castille and Leon, Spain

Ribadelago de Franco, Castille and Leon, Spain

Ribadelago de Franco, Castille and Leon, Spain

Canencia, Comunidad de Madrid, Espaa

Melgar de Tera, Castille and Leon, Spain

Amer, La Rioja, Spain

Logrono, La Rioja, Spain

Ribadelago de Franco, Castille and Leon, Spain

Ribadelago de Franco, Castille and Leon, Spain

Madrid, Madrid, Spain

Mahide, Castille and Leon, Spain