Diatoms (
Greek: (dia) = "through" + (temnein) = "to cut", i.e., "cut in half") are a major group of
eukaryotic algae, and are one of the most common types of
phytoplankton. Most diatoms are
unicellular, although some form chains or simple
colonies. A characteristic feature of diatom cells is that they are encased within a unique cell wall made of
silica (hydrated silicon dioxide) called a frustule. These frustules show a wide diversity in form, some quite beautiful and ornate, but usually consist of two asymmetrical sides with a split between them, hence the group name.
Fossil evidence suggests that they originated during, or before, the early
Jurassic Period.
See more at Wikipedia.org...
Free Download Now!
