More pics here.
The BBC wrote:
Scientists have discovered a further two species of colourful deep-sea dwelling worms. This image shows the bright yellow kidneys and purple mouth of the transparent "shining bomber" (Swima fulgida), discovered off the coast of California, US. The findings are published in the Zoological Journal of the Linnean Society.
Dr Karen Osborn and colleagues from the Scripps Institute of Oceanography and Monterey Bay Aquarium Research Institute suggest that the black area of the shining bomber's gut - just behind its head - could help to hide the transparent worm's glowing prey while it is consuming them.
Swima worms can measure up to 3cm (1.2 inches) long and use fan-like bristles to swim through the water at depths of more than 2,700 metres. They are also bioluminescent: producing light in the gloomy depths of the ocean through a chemical reaction in their bodies.