Chrysaora pentastoma is a scyphozoan jellyfish (family Pelagiidae) found in the tropical and subtropical Indo-Pacific, with five arms rather than the four characteristic of most Chrysaora species—a distinctive morphological feature reflected in its specific epithet (penta = five, stoma = mouth). It inhabits tropical coastal and open-ocean waters and is a planktonic predator of zooplankton and small fish. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.