Before 1962, only eleven damaged specimens from the North Atlantic had been examined, mostly brought up from waters deeper than 1,500 m (4,900 ft).

[5] In a study of deep sea jellyfish in the Southern Ocean performed by the USNS Eltanin, the coronates Periphylla periphylla, Atolla wyvillei and Atolla chuni were the most common species found, comprising over 90% of the individuals sampled.

[6] A study using a remotely operated vehicle in deep water in the Japan Trench showed that P. rufescens was the most common scyphomedusan there.

[7] It has also been recorded from several locations in the eastern Pacific Ocean, including off the coast of southern California.

Some parts of the body have a higher nitrogenous content than others, and in the Pacific, leatherback sea turtles, whose diet consists largely of jellyfish, have been observed feeding on their gonads and tentacles, the parts which have the highest nutritional values.