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The marine dinoflagellate Amphisolenia bidentata possesses complete intracellular symbionts of prokaryotic and eukaryotic origin. This was confirmed ultrastructurally little over 20 years ago when it was showed that the eukaryotic endosymbiont had a nucleus, a chloroplast and mitochondria. We collected Amphisolenia bidentata cells in the Indian Ocean and the identity of the eukaryotic endosymbionts...