It is argued that Emarginula fissura (Linné, 1758) and Semperia paivana Crosse, 1867, are different species, whereas Semperia is a junior synonym of Emarginula.

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Nederlandse Malacologische Vereniging

J.J. van Aartsen, & J. Goud. (2002). On the occurrence of Emarginula paivana (Crosse, 1867) on the coast of Madeira (Gastropoda, Vetigastropoda, Fissurellidae). CANCAP Project contribution No. 126. Basteria, 66(1/3), 1–6.