Fig 4. Two types of ontogenetic development of planulae in Maizuru Bay.

Transformation process of the direct-development type from planula (A) to ephyra (F). The images B–F were taken 2, 6, 10, 12, and 15 days after the onset of incubation at 10°C, respectively. Transformation process of the metagenetic type from planula (G) to polyp (H). The image H was taken 7 days after the onset of incubation at 28°C. In B–E and H, A. coerulea attached to the wall of 24-well plates located in the lower part of the pictures. The scale bars indicate 1 mm.