The larval morphology of Cyptus ardoini (Pierre, 1972) (Opatrini: Ammobiina) is described and illustrated for the first time. Authors considered this Namibian species as closely related to Japanese Caedius maderi Kaszab, 1942 based on the unique fore legs structure. Interpretation of the character structure of the head capsule was presented based on the comparative analysis using micro computed tomography (micro-CT).