Palythoa umbrosa is a shade-tolerant zoantharian (family Sphenopidae) found in shallow to moderately deep reef environments across the Indo-Pacific, typically inhabiting overhangs, crevices, and shaded reef walls where light intensity is reduced. Like other Palythoa species, it incorporates foreign particles into the coenenchyme and may produce palytoxin-related compounds. Its preference for shaded habitats distinguishes it ecologically from many congeners that occupy exposed reef flats. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.