Assigned to Suessaceae in some treatments. Not validly published; validly published as Symbiodinium Gert Hansen & Daugbjerg, 2009, however the latter is regarded as a synonym of Zooxanthella, refer Guiry & Andersen, 2018.
Guiry, M. D.; Andersen, R. A. (2018). Validation of the generic name Symbiodinium (Dinophyceae, Suessiaceae) revisited and the reinstatement of Zooxanthella K.Brandt. <em>Notulae Algarum.</em> 58: 1-5.available online athttp://www.notulaealgarum.com/documents/Notulae%20algarum%20No.%2058.pdf