The flower hat jelly (Olindias formosus) is a species of hydromedusa in the hydrozoan family Olindiidae.

Flower hat jellies occur in the northwestern Pacific off central and southern Japan, and South Korea's Jeju Island.

[4] The adult form of the flower hat jelly only lives a few months and is typically seen from December to July, with peaks in April and May.

[3] During the day they rest on the bottom, often among rocks or algae, but at night they float up to hunt for their prey,[3] typically small fish.

[5] The sting of the flower hat jelly is generally mildly painful and leaves a rash.

This indicates that hydroid growth and reproduction (budding) occur in 15 °C (59 °F) or less, while warmer temperatures initiate the change into medusae.

This causes the replication of COVID to be slowed and halted, preventing the virus from continuing to attack the immune system.