members of Phaeophyceae (brown algae) possess chlorophyll a, c, carotenoids, and xanthophylls, and their color depends on the amount of the xanthophyll pigment, fucoxanthin . Members of Rhodophyceae (red algae) contain chlorophyll a, d, and the red pigment r-phycoerythrin . Therefore, the correct pair is Phaeophyceae (fucoxanthin) and Rhodophyceae (phycoerythrin).