These are fearless insects-like crabs that live in underground rivers of Middle East. Just as the same with the firecracker beetles, The centiscarabs aren't real. These too were announced by Jay that they were a misleading description of a known animal. These creatures have the ability to manipulate solid structures; such as sands and solid grounds. Although these creatures are related to sea crustaceans, their tough outer shell, and air-breathing lungs allow them to live on land.
Biology of the species
They may seem like centipedes, but are really big species of Malacostraca (class includes crabs, omars, shrimps...) Like their real relatives, they are aquatic and mainly found in the legendary mother river. They seem to have a symbiotic relationship with a species of plant known as the Methuselah Tree.