Prehistoric times had no shortage of pretty scary creatures, but you need to look no further than this huge arthopod to find something truly terrifying.

They’re also one of the world’s largest arthropods, animals with no backbone, external skeletons, and multiple-jointed appendages. In this crab’s case, those appendages are its 10 legs.

It’s essentially a souped-up undersea version of the sow bug, a similarly-segmented arthropod found in people’s gardens. Researchers from Hanoi University originally purchased the colossal ...

These included brachiopods, which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods—the ancestors of insects, spiders ...

offering a rare glimpse into the nervous system architecture of ancient animals. Ecdysozoans include arthropods (such as insects and crabs), nematodes (roundworms), and smaller groups like ...