| Noun | 1. | Brachyura - an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface animal order - the order of animals brachyuran - typical crabs crab - decapod having eyes on short stalks and a broad flattened carapace with a small abdomen folded under the thorax and pincers genus Menippe, Menippe - stone crabs Cancridae, family Cancridae - many of the best known edible crabs family Portunidae, Portunidae - swimming crabs family Pinnotheridae, Pinnotheridae - tiny soft-bodied crabs family Lithodidae, Lithodidae - deep-sea crabs of cold waters family Majidae, Majidae - spider crabs Reptantia, suborder Reptantia - lobsters; crabs |