Type specimens of Supplanaxis nucleus and relevant planaxids. A Buccinum nucleus Bruguière, 1789. Neotype, MNHN-IM-2000-35804 B Planaxis planicostatus G.B. Sowerby I, 1825. Syntype NHMUK 1966623 (© The Trustees of the Natural History Museum, London, http://creativecommons.org/licenses/by/4.0/; https://data.nhm.ac.uk/object/4767541c-a5d1-41db-aa0c-0c03724e970a) C Planaxis (Supplanaxis) nancyae Petuch, 2013. Holotype, FMNH 328402 (© Field Museum of Natural History–CC BY-NC; https://collections-zoology.fieldmuseum.org/catalogue/2877223) D Planaxis niger Quoy and Gaimard, 1833. Syntype, one of 22 specimens, MNHN-IM-2000-27769 E Planaxis nucleola Mörch, 1876. Probable holotype, ZMK 152749. Scale bar: 1 cm.