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Environment
Benjamin Harris, Postdoctoral Research Fellow, Marine Ecology, University of Exeter

Ocean sediment is a ‘mudtropolis’ – meet the carbon-cycling creatures thriving beneath the seabed

A brittlestar found in a sediment sample collected from within the South Arran marine protected area. Matt Jarvis, CC BY-NC-ND

Sitting in darkness, deep below the sunlit surface, an iridescent nightmare awaits its prey. With precision and speed, it strikes and slices a passing fish clean in half with a set of jaws twice the width of its head. The armour-plated creature retreats into its hole, quarry in tow, to rejoin the bustling metropolis of animals living in a network of burrows in the mud.

This scene of a hunting bobbit worm is not one of science fiction, set on a far-flung planet. This creature lives within the seabed of the Earth’s continental shelf. This alien world, collectively the size of the North American continent, has been largely ignored.

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