Heterolobosea
Heterolobosea
Heterolobosea is a class of amoeboid protists within the phylum Percolozoa. These organisms are notable for their ability to transform between amoeboid and flagellate forms, a process known as amoeboflagellate transformation. Heterolobosea includes both free-living and parasitic species, some of which are of medical importance.
Characteristics[edit | edit source]
Heteroloboseans are characterized by their unique life cycle, which includes amoeboid, flagellate, and cyst stages. The amoeboid stage is typically the feeding stage, where the organism engulfs bacteria and other small particles. The flagellate stage is often used for dispersal, allowing the organism to move through water more efficiently.
Morphology[edit | edit source]
In the amoeboid form, heteroloboseans exhibit lobose pseudopodia, which are broad and blunt extensions of the cell used for movement and feeding. In the flagellate form, they possess one or more flagella, which are whip-like structures that propel the organism through its environment.
Life Cycle[edit | edit source]
The life cycle of heteroloboseans can vary significantly between species. Some species, such as those in the genus Naegleria, can switch between amoeboid and flagellate forms in response to environmental conditions. This transformation is reversible and can occur rapidly.
Taxonomy[edit | edit source]
Heterolobosea is a class within the phylum Percolozoa. It includes several genera, such as:
These genera are further divided into species, some of which are pathogenic to humans.
Medical Importance[edit | edit source]
One of the most well-known members of Heterolobosea is Naegleria fowleri, often referred to as the "brain-eating amoeba." This organism can cause a rare but severe infection of the brain called primary amoebic meningoencephalitis (PAM). PAM is typically contracted when contaminated water enters the body through the nose, allowing the amoeba to reach the brain.
Ecology[edit | edit source]
Heteroloboseans are found in a variety of environments, including freshwater, soil, and marine habitats. They play a role in the ecosystem as both predators of bacteria and as prey for larger organisms.
Also see[edit | edit source]
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