Nomenclature
In systematic literature before 2010 the name Melanatria Bowdich,1822 was generally used for this group. Another name, which was used particularly in earlier taxonomic literature of the 19th century is Pirena Lamarck, 1799. However, it has been shown that both names are not available for this genus. The name Melanatria is a nomen dubium, not based on a recognizable species while the name Pirena is a junior synonym of Faunus Born, 1758, which is a different genus within the family Pachychilidae. Therefore, introduction of a new name, Madagasikara, was required to maintain a stable taxonomy.
Read more about this topic: Madagasikara (gastropod)