Ryan Photographic - Ethusidae - Sumo crabs
The family Ethusidae contains 4 genera. Little information is available on this family. However, they typically carry cmidarians around for protection. I was photographing the upside-down jelly below when it suddenly got up and ran away at high speed!
Ethusa species Jellyfish carry crab
Ethusa species Jellyfish carry crab, Magic Bay Rao, Morotai P7033509