Also known as Crown Sea Jelly, Crowned Jellyfish, Pulsating Jellyfish, Purple Crowned Jelly, Sea Jellies, Transparent Crown Jellyfish, True Jellyfish.
Found in deep water during the day where the water is cold, then at night they come to near the surface drifting in bays, estuaries and lagoons feeding. Also found washed up over beaches.
They feed on zooplankton.
Length - 20cm
Depth - 0-900m
These jellyfish are different in shape because of a deep groove running around the bottom of the umbrella, giving them the appearance of a crown.
Jellyfish are 95% water.
They have no heart, brain, blood, or gills. The body of the Jellyfish is called a bell. They do have a mouth, tentacles and arms around their mouth. They use their arms around their mouth to help sense and find food that ends up inside their mouth.
In the winter they disintegrate, the offspring surviving as larvae attached to the bottom. By asexual reproduction they form stacks of platters, and these platters are released in the spring to start their pelagic life.
Their only predators are Bannerfish and Arrow Crabs. Ref: https://www.sealifebase.ca/summary/Netrostoma-setouchianum.html