Japan’s new “samurai jellyfish” is simply stunning

Scientists in Japan have discovered Physalia mikazuki, a previously unknown species of Portuguese man-of-war, in northern waters for the first time. DNA and anatomical analysis confirmed it as distinct from tropical relatives. Ocean simulations suggest warming currents transported it northward, offering new clues about changing ecosystems. The find underscores both marine adaptation and safety concerns for beachgoers.

source https://www.sciencedaily.com/releases/2025/11/251101000342.htm