Aurelia aurita is a species of the family Ulmaridae. All species in the genus are very similar, and it is difficult to identify Aurelia medusae without genetic sampling; most of what follows applies equally to all species of the genus.
Aurelia aurita
Aurelia with an anomalous number of gonads—most have four.
Three moon jellies captured by a lion's mane jellyfish
Aurelia aurita in the Pairi Daiza aquarium, Belgium
Jellyfish, also known as sea jellies, are the medusa-phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria.
Jellyfish
A purple-striped jellyfish at the Monterey Bay Aquarium
Fossil jellyfish, Rhizostomites lithographicus, one of the Scypho-medusae, from the Kimmeridgian (late Jurassic, 157 to 152 mya) of Solnhofen, Germany
Stranded scyphozoans on a Cambrian tidal flat at Blackberry Hill, Wisconsin