Telmatactis stephensoni is a sea anemone (family Isophellidae) found in shallow tropical reef environments of the Indo-Pacific and Caribbean, characterized by a robust column with distinctive mesenterial arrangements and nematocyst-laden tentacles for prey capture inhabiting crevices and rubble zones. Its placement within Actiniaria has been clarified through molecular phylogenetic analyses, revealing relationships to other shallow tropical anemone families. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.