Stichodactyla haddoni, Haddon's carpet anemone (family Stichodactylidae), is one of the largest sea anemones in the world, found in shallow sandy and rubble substrates of the Indo-Pacific with a broad, flat oral disc reaching up to 1 m in diameter bearing thousands of short, sticky tentacles that can trap and paralyze prey. It serves as a host anemone for at least eight species of clownfish including Amphiprion clarkii and A. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.