Search results
Results from the WOW.Com Content Network
Spiral pellicle strips. Euglena lacks a cell wall. Instead, it has a pellicle made up of a protein layer supported by a substructure of microtubules, arranged in strips spiraling around the cell. The action of these pellicle strips sliding over one another, known as metaboly, gives Euglena its exceptional flexibility and contractility. [19]
Euglenoids are distinguished mainly by the presence of a type of cell covering called a pellicle. Within its taxon, the pellicle is one of the euglenoids' most diverse morphological features. [7] The pellicle is composed of proteinaceous strips underneath the cell membrane, supported by dorsal and ventral microtubules. This varies from rigid to ...
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.
As with other euglenids, cells in the Euglenaceae are surrounded by a series of proteinaceous strips called the pellicle; the pellicle can stretch in most genera, allowing the cell to contract, creating a type of movement called metaboly.
On the inner periplast part there may be seen intermembrane particles that penetrate the plasma membrane into the protoplasm. These intermembrane particles are larger around the plate boundaries. [1] The Dinophyceae has a cell covering called the amphiesma–cisternae-like vesicles in a thecal form structure.
Peranema's basic anatomy is that of a typical euglenid. The cell is spindle or cigar-shaped, somewhat pointed at the anterior end. It has a pellicle with parallel finely-ridged proteinaceous strips underlain by microtubules arranged in a helical fashion around the body. With this type of pellicle, which is shared by many euglenids, the ...
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]
Like other members of the Euglenida, their cells are lined by a pellicle composed of proteinaceous strips that interlock with each other, and are spirally arranged underneath the cell membrane. In particular, members of Spirocuta share a synapomorphy , or unique trait: their high number of strips (between 16 and 56) confers the cells with an ...