It is shown that Cyclodostomia Sacco, 1892, is a monotypic subgenus of Odostomia Fleming, 1813, with the only (type-) species Odostomia (Cyclodostomia) italiana Corgan & Van Aartsen, 1998. Marginodostomia Nomura, 1936, which has been considered as synonymous, is here shown to be a full genus and its contents critically evaluated. Species of Marginodostomia occur throughout the world from Paleocene to Recent. Fifteen species are referred to it.

Pyramidelloidea, Heterobranchia, systematics, Gastropoda, nomenclature, Cyclodostomia, Marginodostomia

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Nederlandse Malacologische Vereniging

J.J. van Aartsen, & J.X. Corgan. (1999). Review of Cyclodostomia Sacco, 1892 and Marginodostomia Nomura, 1936, two taxa of the Pyramidellacea (Gastropoda: Heterobranchia). Basteria, 63(1/3), 61–68.