Aurelia coerulea is a scyphozoan jellyfish closely related to A. It forms large aggregations in semi-enclosed bays and estuaries, often associated with eutrophication and warming temperatures. The species undergoes the typical scyphozoan life cycle with polyp strobilation producing ephyrae that develop into medusae. Its blooms cause significant ecological and economic disruption in East Asian coastal fisheries and aquaculture. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.