Marginal costae: 5 in 5um
1 process on valve face
Collected in Freda Haffner Kettlehole State Preserve wetland.
Collected in plankton tow at GLEON buoy on West Okoboji
Diatoms are a major group of algae, and are among the most common types of phytoplankton. Most diatoms are unicellular, although they can exist as colonies in the shape of filaments or ribbons (e.g. Fragilaria), fans (e.g. Meridion), zigzags (e.g. Tabellaria), or stars (e.g. Asterionella). Diatoms are producers within the food chain. A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule....