The scientific name for crabs is "Brachyura." Brachyura is a taxonomic infraorder within the order Decapoda, which includes crustaceans with a broad, flattened body and a pair of pincers. They belong to the class Malacostraca, the largest class of crustaceans. Brachyura encompasses a diverse range of crab species found in various marine, freshwater, and terrestrial habitats worldwide. These creatures are characterized by their ten limbs, with the front pair modified into pincers. Their body structure and adaptations allow them to scuttle sideways, swim, burrow, and even climb trees in some cases. Crabs play important ecological roles and are a valuable food resource for humans in many cultures.