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Urechis unicinctus

Aurelia labiata

Deepstaria enigmatica

Congophiloscia saothomensis

They are all ok, but if you choose one of the first two, make sure there is enough new information that isn't already cited in the article. If you choose one of the last two, make sure there are enough sources on that specific species. - Josh

Aurelia is a genus of jellyfish commonly called the moon jellyfish. It is often considered the most well studied zooplankton. They are found in coastal areas and around man-made structures where it is safer for their polyps to develop. Aurelia reproduce sexually in the medusa stage and asexually in the polyp stage of their life cycle. There are two species of Aurelia that are commonly recognized; A. aurita and A. labiate. The genus was first described in 1845 by Jean-Baptiste Lamarck in his book Histoire Naturelle des Animaux sans Vertebres (Natural History of Invertebrates).

Environment
Aurelia have a wide range of marine environments and have been found along coastal regions between 70 degrees north to 55 degrees south (6). They are often considered to be the most widely distributed genus of jellyfish. (12) The species A. aurita tends to live in all oceanic areas other than the northern arctic where-as its counterpart, A. labiata inhabits the northern polar regions of the ocean (12). The ability for Aurelia to adapt to a large range of temperatures and salinities may show a flexibility in their ecology and life history (5) that allowed them to adapt to these variations throughout their evolution (3). However, many live along the coast in temperate climates (10) and around coastal environments where it is safer for the polyps to develop (1). As the temperature of the water increases, whether with global warming or seasonal, the number of medusae increases as well as the ratio of polyps to medusae (8). Without the influence of wind and water currents, Aurelia live alone, however, they are thought to be brought together into aggregations as a result of wind and water currents (10). With all of the variability from their environments, the medusae of Aurelia are able to “de-grow” which allows them to cheat death in a way until proper conditions are met in order to survive by becoming a smaller medusa (5).

Speciation
There is a debate around exactly how many species of Aurelia there are. There have been many studies done to accurately determine the just how many species and subspecies of Aurelia there are. Some have used DNA evidence from both mitochondrial and nuclear ribosomal DNA in order to accurately depict this number. According to one study there are 16 different species of moon jellyfish (6) and another suggests there are only 12 (7) and yet another suggests that Aurelia is a polyphyletic clade, a group of organisms that are grouped together but do not share a common ancestor, and that there are 13 species (4). However, collectively it is agreed that there are two specifically recognized species of Aurelia; A. aurita and A. labiate, along with some subspecies. (7)

Appearance
The differing appearances of moon jellyfish is what has made them so hard to identify. They tend to have a variety of different sizes (9), however, they typically range from 5-38 centimeters in diameter with an average of 7 inches wide and three inches in height (10). The polyps of these amazing jellyfish can grow to 1.6 centimeters tall and their ephyrae, the larval form of the jellyfish, have an average diameter of 0.4 centimeters (1). The adult medusae are typically translucent in color (1) but the color of their gut can change based on what they eat; for example, if they eat crustaceans, they can have a pink or lavender tint to them and if they were to eat brine shrimp, the tint would be more of an orange color (2). A. aurita typically have shorter tentacles in the middle of the bell shape, other than the longer ones that are on the circumference of the bell, with cilia, small hair-like structures, on them in order to sweep prey towards the edge of the bell where there is a mucous layer and oral arms (2). A. labiata have just the opposite, where the oral arms are longer than their bell tentacles (2). Their polyps can have up to twenty-two tentacles to help with feeding and other necessary activities (1).

Feeding
The diet of Aurelia is similar to that of other jellyfish. They primarily feed on zooplankton (10). They store their prey in special pouches until they are ready to eat it and use their four oral arms (1) to bring it to the mouth (2). However, their feeding can cause economic issues. They commonly either prey on or compete with the commercial fisheries and their larvae as well as cause several issues for trawling boats (6) such as loss of revenue due to lost fishing time and bycatch, damage done to gears in the boats and the equipment, and having to relocate due to large aggregations (13).

Special Characteristics
Like many invertebrates, Aurelia have special characteristics. They are able sense light and dark and sense up and down (10) using statocysts around the bell. But that is not all these jellies have to offer. After many tests on frogs, it was determined that A. Aurita has a proteinaceous venom that causes muscle twitching by inducing the irreversible depolarization of the muscle membrane that is believed to be caused by an increase in the membrane’s permeability to sodium ions (11).

Reproduction
The reproduction of Aurelia has been studied extensively by scientists. The medusa stage of the jellyfish reproduce sexually. The males release strings of sperm and the females ingest them (2). Once the ciliated larvae develop from the egg, they settle on or near the sea floor and develop into benthic polyps. The polyps can alternate between reproductive phases and feeding phases for up to twenty-five years (2). The polyps then reproduce asexually and bud into ephyrae which later turn into medusa. However, Aurelia typically reproduce when there are too many nutrients in the surrounding waters (2).


 * 1) List Item Fletcher, McKenzie. “Aurelia.” Animal Diversity Web,