Aurelia aurita; Print; Aurelia aurita (also called the common jellyfish; moon jellyfish; moon jelly or saucer jelly) is a widely studied species of the genus Aurelia. All species in the genus are closely related; and it is difficult to identify Aurelia medusae without genetic sampling; most of what follows applies equally to all species of the genus. The most common method used to identify the species consists of selecting a jellyfish from a harbour using a device; usually a drinking glass and then photographing the subject. This means that they can be released in to the harbour shortly afterwards and return to their natural habitat.