Actinocyclus
Actinocyclus is a genus of centric diatoms belonging to the family Actinocyclaceae. Diatoms are a major group of algae, and are a significant component of phytoplankton. They are ubiquitous in freshwater, marine, and brackish environments. Centric diatoms are characterized by their radial symmetry, with a cell wall (frustule) composed of two overlapping halves (valves).
Common Names
There are no widely used common names for the genus Actinocyclus.
Characteristics
Actinocyclus species are characterized by their circular or slightly elliptical valves, which often possess a distinctive radiating pattern of striae (fine lines). The striae can be straight or curved, and they are typically arranged in a radial pattern. The center of the valve often contains a central nodule, and the valve margin is often characterized by a series of marginal spines or processes.
These diatoms are known for their unique valve morphology, which is characterized by a circular shape, radial symmetry, and distinctive striae patterns. The striae are often arranged in radiating rows, forming a characteristic starburst pattern. The valves also possess a central nodule, which is a small, raised area located in the center of the valve.
Actinocyclus species are often found in marine environments, where they play an important role in the food web. They are also known to form large blooms, which can have significant ecological and economic impacts.
Environments
Actinocyclus species are predominantly marine diatoms and can be found in a wide range of environments, including:
- Coastal waters
- Open ocean
- Estuaries
- Upwelling zones
Some species are also known to occur in brackish waters.