Brandt coined the genus Zooxanthellae (Gk. Zoo animal + Xanth yellow + ella diminutive = “yellow animal cells”) to refer to these algae. The term zooxanthellae properly applies to a paraphyletic group consisting of all golden-colored endosymbiotic macroalgae, but is now commonly (but incorrectly) used to refer exclusively to symbiotic dinoflagellates (and in particular the most common marine algal symbionts in the genus Symbiodinium). Because this term lacks useful taxonomic meaning, its use should generally be discouraged;
p.178; in ....
Baker A.C., 2004; Symbiont Diversity on Coral Reefs and its Relationship to Bleaching Resistance and Resilience; in Rosenberg & Loya (ed.); Coral Health and Disease; Springer Verlag, Heidelberg - FRG;