The International Commission on Zoological Nomenclature has conserved the current usage of the specific names of three terrestrial snail species, Clausilia index , Clausilia semilamellata and Clausilia derasa , by suppressing their respective unused senior synonyms Clausilia unilamellata , Clausilia multilamellata and Clausilia firmata .
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30 August 2021
Opinion 2481 (Case 3777) – Clausilia index Mousson, 1863, Clausilia semilamellata Mousson, 1863, Clausilia derasa Mousson, 1863 (Gastropoda, Stylommatophora, Clausiliidae): specific names conserved by suppression of the respective senior synonyms, Clausilia unilamellata Mousson, 1856, Clausilia multilamellata Mousson, 1856 and Clausilia firmata Mousson, 1856
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