Girardi 2009. [Palacanthilhiopsis carolinae, new species, Palacanthilhiopsis kuiperi, new species (original description and anatomy), Palacanthilhiopsis vervierii Bernasconi, 1988 (variation, polymorphism and distribution), in the south of France. (Mollusca: Caenogastropoda: Hydrobiidae: Belgrandiinae).] Documents Malacologiques Hors Serie, 3, avril 2009: 89-104