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Heterotrophy with loss of chloroplasts occurs in several algal classes.  At least five gemera have become independently colorless - Helicosporidium, Prototheca, Polytoma and Polytomella (Figueroa-Martinez et al. 2015).

Figueroa-Martinez, F., A.M. Nedelcu, D.R. Smith and A. Reyes-Prieto  2015.  When the lights go out:  the evolutionary fate of free-living colorless green algae.  New Phytologist 206(3):972-982.