Crab on the sternum, form a monophyletic group. Numbers of extant and extinct (†) species are given in brackets. The superfamily Eocarcinoidea, containing "Eocarcinus" and "Platykotta", was formerly thought to contain the oldest crabs; it is now considered part of the Anomura. Both the constellation Cancer and the astrological sign Cancer are named after the crab, and depicted as a crab. William Parsons, 3rd Earl of Rosse drew the Crab Nebula in 1848 and noticed its similarity to the animal; the Crab Pulsar lies at the centre of the nebula. The Moche people of ancient Peru worshipped nature, especially the sea,
River crab (Internet slang) represents a sarcastic defiance against official discourse and censorship. Some observers, however, have warned that the practice may also reproduce domination, since it does not aim for the abolition of censorship. The sensitive words will remain silent as such, and as a result the everyday reappropriation of official language creates the conditions for the latter's perpetuation. A well-known picture usually named "River crab society, three wearing watches" (河蟹社会，三个戴表) illustrates the slang "river crab". In the picture, the three wristwatches refer to the Three Represents, where the Mandarin expressions used for "represent" () and "Wearing watch(es)" () are homophones. The satirized