Pelagophyceae

Pelagophyceae is a class of heterokont algae. It is the sister group of 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 class contains 13 genera, 3 families and 2 orders (2017):
It is expected that molecular studies will add more species to this list.