Researchers have identified a new species of box jellyfish, named Chironex blakangmati, in the waters surrounding Sentosa Island, Singapore. This discovery was made by scientists from Tohoku University and the National University of Singapore, who noted that the area has a historical name meaning 'the island behind which lies death.' The new jellyfish species is closely related to other dangerous box jellyfish, known for their potent venom that can lead to heart failure and nervous system collapse in humans. Initially mistaken for the species Chironex yamaguchii, genetic testing revealed its distinctiveness, particularly in the structure of its perradial lappets, which lack pointed canals found in other species. Additionally, researchers documented the first sighting of another venomous jellyfish, Chironex indrasaksajiae, in Singapore, which was previously known only in Thai waters. Understanding the distribution and migration patterns of these jellyfish is crucial, as their stings can be fatal within minutes.