Aurelia sp. 4 Dawson et al 2005 is another cryptic lineage within the Aurelia species complex, identified by molecular markers as genetically distinct from A. Like other members of this complex, it is a typical scyphozoan with a transparent, disc-shaped medusa bearing four horseshoe-shaped gonads and marginal lappets, and may form seasonal blooms in coastal and estuarine habitats. Understanding the genomic distinctiveness of these cryptic species is important for accurate ecological and evolutionary interpretation of jellyfish bloom data.