Coscinodiscophycidae

Coscinodiscophycidae is a subclass of diatoms, previously known as "Centrales", a paraphyletic order of centric diatoms, a major group of algae and one of the most common members of the phytoplankton.

Families

 * Thalassiossiraceae
 * Melosiraceae
 * Leptocylindraceae
 * Coscinodiscaceae
 * Stellarimaceae
 * Hemidiscaceae
 * Asterolampraceae
 * Heliopeltaceae

Description
Valves generally have a marginal ring of processes. They usually have symmetry with no polarities.