Phacus

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. These cells are 'starved', the large paramylon body is considerably reduced and the nucleus is visible. 28 µm.

Phacus monilatus. 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.

Phacus monilatus. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics.   This work was supported by the Australian Biological Resources Study.

Phacus monilatus. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics.   This work was supported by the Australian Biological Resources Study.

Phacus monilatus. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics.   This work was supported by the Australian Biological Resources Study.

Phacus balatonicus, short flattened euglenoid flagellate with no or negligible point at the posterior end, pellicle typically with single longitudinal fold in addition to the fine ridges. Many small discoid chloroplasts. Red stigma. Central circular paramylon body . This individual has shed its flagellum. From freshwater pond near Boise,Idaho. Brightfield.

Phacus contortus (BOURRELLY,1952). DIC.

Phacus contortus (BOURRELLY,1952). Brightfield.

Phacus contortus (BOURRELLY,1952). DIC.

Phacus contortus (BOURRELLY,1952).Brightfield.

Phacus pleuronectes, euglenoid flagellate with a rigid, leaf-shaped pellicle with fine longitudinal striations and short curved spinous posterior. Many discoid chloroplasts. Usually with one large circular central paramylon body (although two are seen in this individual). Red stigma. From freshwater pond near Boise, Idaho. Brightfield

Phacus (fake-us) - one of the genera of autotrophic euglenids, distinguished from Euglena by being flattened or twisted and rigid. This is both flattened and slightly twisted, and has a long posterior spine. The genus is common in freshwater ecosystems, in muds and associated with detritus. Phase contrast.

Phacus (fake-us) - one of the genera of autotrophic euglenids, distinguished from Euglena by being flattened or twisted and rigid. This is slightly flattened and one of the smaller species. The genus is common in freshwater ecosystems, in muds and associated with detritus. Phase contrast.

Phacus (fake-us) (suecicus), the genus Phacus is one of the genera of autotrophic euglenids, distinguished from Euglena a by being flattened or twisted and rigid. This species is a little unusual in having excrescences (hooks or knobs) attached to the outside of the cell. The genus is common in freshwater ecosystems, in muds and associated with detritus. Differential interference contrast.

Phacus (fake-us) (suecicus), the genus Phacus is one of the genera of autotrophic euglenids, distinguished from Euglena a by being flattened or twisted and rigid. Most species are quite flat and twisted, but a few are almost cylindrical and have a slight surface fold. The genus is common in freshwater ecosystems, in muds and associated with detritus. Phase contrast.

Phacus, flattened euglenid flagellate with numerous disc shaped chloroplasts, and anterior red eyespot. The outer region of the cell is called the pellicle and this has a ridged appearance. From Lake Donghu, China. Differential interference contrast micrograph.

Phacus, found in Obsidian Creek, is a flattened, stiff euglenid with numerous small disk-shaped chloroplasts. As with Euglena, there is an eyespot that controls the direction of movement. The clear circular region is the nucleus.

Portrait of Phacus longicauda v. tortus, a large euglenoid flagellate with rigid pellicle twisted about half a revolution about its long axis. Many small discoid chloroplasts. Prominent longitudinal pellicular ridges. Red stigma. Central circular paramylon body (not well seen here). This individual has shed its flagellum. From freshwater pond near Boise, Idaho. Brightfield.

Sampling date 09/2010. Scale bars indicate 25 µm.One emerging flagellum appr. as long as the body (not depicted) and one very short flagellum which doesn’t emerge from the reservoir.Place name: Bog Hegne Moor near Lake Constance (Germany)  Latitude: 47.718106     Longitude: 9.093974Microscope Zeiss Universal, camera Olympus C7070WZ. © Wolfgang Bettighofer,images under Creative Commons License V 3.0 (CC BY-NC-SA).For permission to use of (high resolution) images please contact postmaster@protisten.de.For further information about the image, please click here: Link to protisten.de page

Sampling date 07/2018. Scale bars indicate 100 µm.Two images.Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!Place name: Pond in the forest of Altenholz-Stift (Schleswig-Holstein, Germany)Latitude: 54.384913     Longitude: 10.125691Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.© Wolfgang Bettighofer,images under Creative Commons License V 3.0 (CC BY-NC-SA).For permission to use of (high resolution) images please contact postmaster@protisten.de.For further information about the image, please click here: Link to protisten.de page

Sampling date 07/2018. Scale bars indicate 100 µm.Two images.Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!Place name: Pond in the forest of Altenholz-Stift (Schleswig-Holstein, Germany)Latitude: 54.384913     Longitude: 10.125691Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.© Wolfgang Bettighofer,images under Creative Commons License V 3.0 (CC BY-NC-SA).For permission to use of (high resolution) images please contact postmaster@protisten.de.For further information about the image, please click here: Link to protisten.de page

Sampling date 05/2019. Scale bar indicates 50 µm.Place name: Creek in Oder valley 100 km north east of Berlin (Germany)  Latitude: 53.135032     Longitude: 14.348738Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII.© Wolfgang Bettighofer,images under Creative Commons License V 3.0 (CC BY-NC-SA).For permission to use of (high resolution) images please contact postmaster@protisten.de.For further information about the image, please click here: Link to protisten.de page

Place name: Ponds near Hausen (Germany) Latitude: 49.886491     Longitude: 9.206450Microscope Zeiss Axioplan, camera DSLR type.Copyright Winfried Hölz, Hausen, Germany.© Wolfgang Bettighofer,images under Creative Commons License V 3.0 (CC BY-NC-SA).For permission to use of (high resolution) images please contact postmaster@protisten.de.For further information about the image, please click here: Link to protisten.de page