New taxonomic and phylogeographic data on three nominal species of the genus Septaria Férussac, 1807 (Gastropoda: Cycloneritida: Neritidae)

Due to superficial morphological similarities, there is often confusion in the identification of some species of the genus <em>Septaria</em>. A combined analysis of the genital anatomy, morphometric and DNA, based on a portion of the COI gene, applied to three nominal species of this genus, confirmed the validity of <em>Septaria tahitian</em>a Eichhorst, 2016, and suggested that <em>Septaria borbonica</em> (Bory de Saint Vincent, 1804) is a subspecies of <em>Septaria porcellana</em> (Linnaeus, 1758), both taxa with disjunct distribution areas: <em>Septaria borbonica</em> in the western Indian Ocean and<em> Septaria porcellana</em> the western Pacific and eastern Indian Oceans. The possible presence of <em>Septaria tesselata</em> (Lamarck, 1816) in Mayotte (Comoros Archipelago) needs to be confirmed.