Beroe cucumis is one of a number of comb jellies found around the UK. It doesn't have a common name but if you imagine a flexible courgette, that gives a good idea of size and shape. Like all comb jellies, it is an active predator, feeding on other members of the plankton community and in particular, other comb jellies. It is able to move through the plankton and hunt for its food by beating the tiny plates which make up the eight comb rows along its body. As they beat, these plates refract the light and all the colours of the spectrum flow along these rows.
North Sea. St. Abbs Marine Reserve