Abstract An anatomical and taxonomic study of Megalobulimus oblongus (Müller, 1774) and M. conicus (Bequaert, 1948) (Strophocheilidae, Megalobuliminae) is carried out, based mainly on samples from the south-central region of Bahia, Brazil. It revealed interesting anatomical differences in several structures, mainly in the pallial cavity, with greater ramification of vessels in the respiratory region of M. oblongus when compared to M. conicus; and in the genital system of M. conicus, which has a more elongated prostate, and the folds of the penis are more spaced. A taxonomical discussion is presented, including several characters confirmed as typical of the genus and subfamily, such as buccal flange, prerectal valve and pulmonary septum.

Abstract New records for Helicina schereri Baker, 1913, are reported. It was a species previously restricted to the states of Ceará, Rio Grande do Norte, Paraíba, Alagoas and Tocantins in Northeastern Brazil, and State of Santa Catarina, much further south. The new occurrences reported herein fill distribution gaps and also significantly expand the range of the species ca. 970 km westwards. The new records are from the following locations: Bahia State (Ituaçu and Itaquara municipalities) in Northeast Brazil; Mato Grosso do Sul State (Bonito Municipality) in the Midwest; and Minas Gerais (Lagoa Santa municipality) in the Southeast.