Coscinodiscophycidae

Coscinodiscophycidae or Coscinodiscineae is a grouping of Coscinodiscophyceae, 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. Valves generally have a marginal ring of processes. They usually have symmetry with no polarities.