Tricornis
Tricornis is a genus of marine planktonic diatoms, belonging to the family Thalassiosiraceae. These single-celled algae are known for their distinctive, three-pronged (tri-corn) structure, giving rise to their name.
Common Names
Diatoms belonging to this genus are commonly referred to as "triradiate diatoms" due to their characteristic three-pronged shape.
Characteristics
Tricornis species are characterized by their unique morphology. They possess a silicaceous cell wall (frustule) that is composed of two overlapping halves (thecae). The valve, the larger of the two thecae, is typically triangular and often bears a distinct three-pronged structure.
Other key characteristics include:
- Size: Tricornis species are generally small, ranging from a few micrometers to tens of micrometers in diameter.
- Structure: The three prongs, or arms, of the valve can be straight, curved, or branched, depending on the species.
- Pigmentation: Like other diatoms, Tricornis species possess chlorophyll and other pigments, giving them a yellowish-brown color.
Environment
Tricornis species are found in a wide range of marine environments, including:
- Coastal Waters: These diatoms are common in coastal waters, particularly in areas with high nutrient levels.
- Open Ocean: They can also be found in the open ocean, where they contribute significantly to phytoplankton biomass.
- Estuaries: Some Tricornis species are adapted to the brackish waters of estuaries.
Ecological Importance
Tricornis diatoms play a vital role in marine ecosystems as primary producers. They convert sunlight into energy through photosynthesis, forming the base of the marine food web. Their abundance and productivity contribute significantly to the overall health and balance of marine ecosystems.
References
Diatoms of the Genus Tricornis from the Coastal Waters of Southern India