Chiropsalmus quadrumanus
Chiropsalmus quadrumanus, commonly known as the four-handed box jellyfish, is a species of box jellyfish found in the western Atlantic Ocean, the Gulf of Mexico and the Pacific Ocean. The sting is venomous and dangerous to humans, especially children.
Yellow boxfish
They are solitary animals. Breeding occurs during the spring, in small groups that consist of 1 male and 2 - 4 females.