Coscinodiscineae
Actinocyclus normanii, a diatom from the family Hemidiscaceae
Scientific classification
Domain:	Eukaryota
(unranked):	SAR
Superphylum:	Heterokonta
Phylum:	Bacillariophyta
Class:	Coscinodiscophyceae
Suborder:	Coscinodiscineae
Families
Thalassiossiraceae Melosiraceae Leptocylindraceae Coscinodiscaceae Stellarimaceae Hemidiscaceae Asterolampraceae Heliopeltaceae

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.^[1]

Description

Valves generally have a marginal ring of processes. They usually have symmetry with no polarities.^[1]