"Plerogyra sinuosa" is a species of "bubble coral". It has grape-sized bubbles which increase their surface area according to the amount of light available: they are larger during the day, but smaller during the night, when tentacles reach out to capture food. This species requires low light and a gentle water flow.
Similar species: Stony Corals
Uploaded Sep 1, 2018. Captured May 18, 2018 09:28 in Unnamed Road, Paudean, Lembeh Sel., Kota Bitung, Sulawesi Utara, Indonesia.