This genus can be easily identified by the yellow coloration in the center of its body which closely resembles an egg yolk, hence its common name.

This species and most of its relatives in the Cnidaria phylum often use suspension feeding as their main food gathering strategy.

P. camtschatica is a large jellyfish that has a yellow center, resembling a broken egg yolk, surrounded by opaque, white tissue.

Due to these findings, the family Phacellophoridae was created specifically for this genus, serving as an intermediate between Cyaneidae and Ulmaridae.

This is possible because the sting of this jellyfish is weak therefore allowing many symbionts/parasites including small crustaceans like larval crabs (Cancer gracilis) and some Amphipoda (Hyperia medusarum) to regularly ride on its bell and even steal food from its oral arms and tentacles.

[8] Larval crabs benefit from this relationship by riding on the bell of the medusa or within the tentacles to gain food and develop faster due to locomotion through warmer surface waters without expending extra energy.

As the crab develops into an instar, it begins to feed on the parasitoid Amphipoda (Hyperia medusarum), which aids the jellyfish in keeping the parasitic impact low.

[10] Similarly, this animal lacks dedicated respiratory, excretory, and circulatory systems because of the high surface area to volume ratio.

These planulae swim for roughly 3–5 days before settling by attaching to the bottom and transforming, or metamorphosing, into the polyp (scyphistomae) stage.

Medusae reach larger bell diameters, additional tentacles form and oral arms elongate.

[13] This cool-water genus are found in many parts of the world's oceans even though the abundance of the sole species in open marine waters is relatively low.

[2] In a study conducted in 2011, the egg-yolk jelly was found to aggregate mostly over deep basins, whereas in shallow areas a significant quantity of this species was found only off West Kamchatka, This is in stark contrast to the other members of the family Ulmaridae (since it is no longer a member) which prefer shallow water.

[2] Also, jellyfish populations (including the egg-yolk jelly) are on the rise in degraded areas as a result of increased tolerance to detrimental factors.

[14] The fried egg jellyfish typically moves faster during the day and swims fastest during flood tides.

This jellyfish undergoes vertical migrations that span the water column throughout short and long time frames.

By diving deep into the hypoxia zone, the fried egg jellyfish evades competition; unlike other species where hypoxia generally causes species to move away from the oxygen depleted zone, the fried egg jellyfish is able to withstand low oxygen levels for several hours at a time.