Pelagophycidae

Pelagophycidae is a subclass of heterokont algae.It is the sister group of the axodines. Together, they form the class Dictyochophyceae.

All known species are marine. They can be single-celled (coccoid or flagellate), palmelloid or filamentous. Some members (Pelagomonas) belong to picoplankton, and some other (Sarcinochrysis) are macroscopic attached organisms.

The subclass contains 13 genera, 3 families and 2 orders (2017):
 * Order Pelagomonadales Andersen & Saunders 1993
 * Family Pelagomonadaceae Andersen & Saunders 1993
 * genus Ankylochrysis Billard 1995
 * genus Aureococcus Hargraves & Sieburth 1988
 * genus Chrysophaeum Lewis & Bryan 1941 non Taylor 1951
 * genus Pelagococcus Norris 1977
 * genus Pelagomonas Andersen & Saunders 1993
 * Order Sarcinochrysidales Gayral & Billard 1977
 * Family Chrysocystaceae Melkonian, Yoon & Andersen 2018
 * genus Chrysocystis Lobban, Honda & Chihara 1995
 * genus Chrysoreinhardia Billard 2000
 * genus Sungminbooa Yoon & Andersen 2018
 * Family Sarcinochrysidaceae Gayral & Billard 1977
 * genus Andersenia Wetherbee & Waller 2015
 * genus Arachnochrysis Andersen & Han 2018
 * genus Aureoscheda Wynne & Andersen 2014
 * genus Aureoumbra Stockwell et al. 1997
 * genus Chrysonephos Taylor 1952
 * genus Nematochrysopsis Billard 2000
 * genus Pelagospilus Andersen & Graf 2018
 * genus Sarcinochrysis Geitler 1930
 * genus Sargassococcus Andersen & Han 2018

It is expected that molecular studies will add more species to this list.