The Indo-Pacific Amalda (Neogastropoda, Olivoidea, Ancillariidae) revisited with molecular data, with special emphasis on New Caledonia Author Kantor, Yuri I. 48F89A50-4CAC-4143-9D8B-73BA82735EC9 Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninski Prospect 33, 119071 Moscow. kantor.yuri1956@gmail.com Author Castelin, Magalie 9464EC90-738D-4795-AAD2-9C6D0FA2F29D Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205 (CNRS, EPHE, MNHN, UPMC), Muséum national d’histoire naturelle, Sorbonne Universités, 43 Rue Cuvier, 75231 Paris Cedex 05, France. magalie.castelin@mnhn.fr Author Fedosov, Alexander 40BCE11C-D138-4525-A7BB-97F594041BCE Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninski Prospect 33, 119071 Moscow. fedosovalexander@gmail.com Author Bouchet, Philippe FC9098A4-8374-4A9A-AD34-475E3AAF963A Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205 (CNRS, EPHE, MNHN, UPMC), Muséum national d’histoire naturelle, Sorbonne Universités, 43 Rue Cuvier, 75231 Paris Cedex 05, France. philippe.bouchet@mnhn.fr text European Journal of Taxonomy 2020 2020-08-21 706 1 59 journal article 10.5852/ejt.2020.706 269e39e4-19ff-4a70-9376-8b7eaf09f663 2118-9773 4010954 C4C4D130-1EA7-48AA-A664-391DBC59C484 Amalda optima (G.B. Sowerby III, 1897 ) Fig. 19E Ancilla optima Sowerby III, 1897: 7 , pl. 6 fig. 31. Amalda optima – Gratecap 2012: 23 , 29, fig. 23. Type material Possible syntype SOUTH AFRICA • Durban; NHMUK 1899.4.14.648. Material examined One sequenced specimen ( Table 1 ). Description MEASUREMENTS. Shell large (SL up to 55 mm ). SHELL. Broadly ovate, with narrow base and low conical spire. Primary spire callus very thick, smooth and glossy, covering all whorls, except tip of protoconch, rendering measurements impossible. Secondary callus rather thick, with distinct anterior border, smooth and glossy, fusing without visible border with parietal callus, and reaching the shell apex. Plication plate smooth, poorly separated from anterior band, columella smooth. Olivoid groove distinct, labral denticle very short, obtuse. Anterior band smooth, upper anterior band nearly flat, lower anterior band weakly convex. Primary callus milky-caramel with distinct sinuous, narrow brown axial lines, particularly pronounced on last whorl, its narrow spiral brown line bordered abapically by lighter, narrow line. Secondary callus caramel to dark brown, turning very light, nearly white, above aperture. Body whorl cloak background light caramel with irregularly spaced, orthocline, brown axial bands of uneven width, olivoid band much lighter than cloak, creamy-coloured, anterior band very dark brown. RADULA. Not studied. Distribution Natal to Mozambique .