Stomatopods branched off from other members of the class Malacostraca around 340 million years ago. Unipeltata, which arose around 193 million years ago. These aggressive and typically solitary sea creatures spend most of their how long to boil shrimp hiding in rock formations or burrowing intricate passageways in the sea bed. Mantis shrimp live in burrows where they spend the majority of their time.