Epizoanthus rinbou is a zoantharian (family Epizoanthidae) described from Japanese waters, forming epizoic colonies on gorgonians, sponges, or hard substrates in subtropical and temperate Pacific waters. Japanese zoantharians including Epizoanthus species have been subjects of natural products chemistry due to their production of palytoxin-class compounds, which are among the most toxic non-protein compounds known. The species highlights the high diversity of zoantharian fauna in the western Pacific. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.