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The creature - called a supergiant - is a type of amphipod, which are normally around 2-3cm long.
But these beasts, discovered in the Kermadec Trench, were more than 10 times bigger: the largest found measured in at 34cm.
Alan Jamieson, from the University of Aberdeen's Oceanlab, said: "It's a bit like finding a foot-long cockroach."
"I stopped and thought: 'What on Earth was that?' This amphipod was far bigger than I ever thought possible."
That means that shrimp, lobsters, and other crustaceans are related – very closely related – not only to cockroaches, but to all other insects