@Katja Schulz: It looks like the NMNH catalogue has Dinoflagellates under Rhodophyta, which is highly unorthodox:
Karenia brevis (C.C. Davis) Hansen & Moestrup in Daug
Any chance this could be updated?
The Newsfeed for this EOL Taxon Page gathers updates associated with items shown on it, including curator actions and comments from EOL users.