The taxonomy of the cheliferid pseudoscorpion genus Chelifer Geoffroy 1762 is reviewed with a single cosmopolitan species, Chelifer cancroides (Linnaeus 1758), with the subspecies C. cancroides orientalis Morikawa 1954 from Japan newly synonymised with C. cancroides. Adults and the final two nymphal stages (tritonymph and deutonymph) are redescribed based on numerous specimens from Europe, North America, Asia and Australasia. The large size variation evident in the samples is documented. The latero-ventral process of the tarsal claws characteristically found in adults (except leg I of the male) is lacking in nymphs, a pattern that is also confirmed in the genera Lissochelifer Chamberlin 1932, Lophochernes Simon 1878 and Parachelifer Chamberlin 1932. Keywords: Taxonomy, morphology, variation, new synonymy