Taxonomic revision of the species of Turbonilla Risso, 1826 (Gastropoda, Heterobranchia, Pyramidellidae) with type localities in Brazil, and description of a new species

The species of the genus Turbonilla described from the Brazilian coast are redescribed, based partly on SEM studies. Turbonilla fasciata (d’Orbigny, 1840), T. turris (d’Orbigny, 1840), and T. brasiliensis Clessin, 1902, are confirmed as valid species. T. puncturata Clessin, 1900, is placed in the synonymy of T. rushii Bush, 1899. Type specimens of T. iheringi Clessin, 1900, and T. portoricensis Clessin, 1900, were not located, and these nominal species are considered unrecognizable. The lectotype of T. americana (d’Orbigny, 1840) does not fit the original concept of that taxon, it does not even belong to the Pyramidellidae; it should be replaced by the remaining syntype after a ruling by the International Commission on Zoological Nomenclature. T. dubia (d’Orbigny, 1840) is classified in the genus Finella A. Adams, 1869. T. macaensis spec. nov., which has been determined elsewhere as T. fasciata, is described from the northern coast of the state of Rio de Janeiro; it occurs from the Brazilian state of Espírito Santo to the coast of Argentina.