original description(ofCerithium (Semivertagus) Cossmann, 1889)Cossmann M. (1889). Catalogue illustré des coquilles fossiles de l'Éocène des environs de Paris. <em>Annales de la Société Royale Malacologique de Belgique.</em> 24: 3-381, pl. 1-12., available online athttps://www.biodiversitylibrary.org/page/5502754 page(s): 28 (94 in reprint); note: as "section" of Cerithium Bruguière, 1789 [details]
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