Noun
haptophyte (plural haptophytes)
(botany) A kind of unicellular marine phytoplankton, typically covered in tiny scales or plates composed of carbohydrates and calcium deposits
Their chloroplasts lack a nucleomorph, their thylakoids are in stacks of three, and they synthesize chrysolaminarin sugar, which they store completely outside of the chloroplast, in the cytoplasm of the haptophyte. Source: Internet
However, the haptophyte was heavily reduced, stripped of a few membranes and its nucleus, leaving only its chloroplast (with its original double membrane), and possibly one or two additional membranes around it. Source: Internet