Fig. 1

Phylogenetic relationships in the Acroporidae and acroporid morphology. a Schematic phylogenetic tree representing evolutionary relationships within the Acroporidae. b and e Colonies of Montipora efflorescens (b) and M. cactus (e). c and d Eggs of M. efflorescens with algal symbionts photographed under visible light (c) and blue light (d). f and g A planula larva of M. efflorescens with algal symbionts, photographed under visible light (f) and blue light (g). h A colony of Acropora tenuis. i and j A planula larva of A. tenuis without algal symbionts photographed under visible light (i) and blue light (j). k A colony of Astreopora myriophthalma. Algal symbionts (brown dots) in eggs and planula larvae of Montipora (c and f). Green fluorescence was from fluorescent proteins of Montipora and red fluorescence was from chlorophyll in algal symbionts (d and g). Orange and cyan-green fluorescence were from fluorescent proteins of Acropora (j)