Trachyphyllia geoffroyi, the open brain coral, is a classic large‑polyp stony coral (LPS).Adults are often free‑living on sand or rubble in lagoons and back reefs (juveniles may begin attached, then detach later).It hosts zooxanthellae (Symbiodiniaceae), relying on photosynthesis by day and ex...
Favia speciosa (also cited as Dipsastraea speciosa) is a photosymbiotic, reef‑building stony coral.It harbours zooxanthellae (Symbiodiniaceae) for most of its energy and supplements this with nocturnal particle/zooplankton capture.Colonies are typically massive to sub‑hemispherical with clearl...