Juvenile polyps of Acropora tenuis colonized by clade C1 or clade D Symbiodinium monoclonal cells.

Photographs of polyps were taken 20, 58, 80, and 120 days after inoculation. On day 20, polyps had only a few clade C1 cells but many clade D cells in their tentacles and body walls. The arrow indicates tentacles. Scale bar = 0.5 mm.