ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Diver collecting a siphonophore colony. Siphonophores are marine invertebrates that live in colonies made up of a number of highly specialised individual organisms (zooids). Each type of zooid (both medusae and polyps) has a specific role to play and none can live without the other. Because of this, siphonophore colonies look like one organism and can often be mistaken for jellyfish. The most famous example of this is the Portuguese man-of-war.
Model release not required. Property release not required.