Radianthus crispa is a large sea anemone (family Stichodactylidae) found in shallow Indo-Pacific reef environments, with a broad oral disc bearing numerous, short, crisped (curly-tipped) tentacles characteristic of this species and family. Like other stichodactylid anemones, it acts as a host to anemonefish (clownfish) of the genus Amphiprion, particularly A. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.