NITSCHKE, Matthew R., Sandra C. CRAVEIRO, Cláudio BRANDAO, Cátia FIDALGO, João SERODIO, António J. CALADO, & Jörg C. FROMMLET 2020 (Apr. 8) Description of Freudenthalidium gen. nov. and Halluxium gen. nov. to formally recognize clades Fr3 and H as genera in the family Symbiodiniaceae (Dinophyceae) Journal of Phycology 56(4): 923-940, 10 figs., 1 table Freudenthalidium heronense, F. endolithicum, and Halluxium pauxillum