Three new species of Mormisma (Thysanura: Lepismatidae) from the Namib desert of South West Africa are descriptionbed. A key to the known species of Mormisma is provided and the place of the genus in the system is discussd. It is proposed thal the smooth rnacrosetae of Mormisma may be due to secondary loss of barbs, making Mormisma and Hyperlepisma a monophyletic group. Keywords: Mormisma peyerimhoffi, Psammophilous siIverfish, Hypodermal pigment, Maxillary palp, Pranotum, Thoracic sterna, Urotergites, Urosternal setation, Apomorph lepismatids, Ultrapsammophilous, lepismatids.