Subphylum: Crustaceans (Arthropoda > Crustacea)
Infraorder: True crabs (Malacostraca > Brachyura)
Family: Edible crabs (Cancridae)
Family: Box crabs (Calappidae)
Family: Inachid spider crabs (Inachidae)
Family: Pilumnidae
Family: Portunidae
Family: Rock crabs (Grapsidae)
Family: Mud crabs (Xanthidae)
Family: Coral guard crabs (Trapeziidae)
Family: Epialtid spider crabs (Epialtidae)
Family: Percnidae
Family: Ghost and Fiddler crabs (Ocypodidae)
Family: Reef crabs (Carpiliidae)
Family: Decorator crabs (Oregoniidae)
Family: Sumo crabs (Dorippidae)
Family: Polybiidae
Family: Elbow crabs (Parthenopidae)
Family: Land crabs (Gecarcinidae)