Galaxea fascicularis is a branching to mound-forming scleractinian coral (family Euphylliidae) distributed across the tropical Indo-Pacific, with long, finger-like corallites and star-shaped apertures whose fleshy polyps extend conspicuously at night for feeding. The species is notably aggressive, deploying long sweeper tentacles to sting adjacent corals, making it a competitive dominant in reef areas. It is commonly encountered in reef surveys and is widely used in aquaculture and restoration research. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.