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Alonso, M.R. & Ibáñez, M. (2007). Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands. Zootaxa, 1482: 1-23. Auckland.
Alonso, M.R. & Ibáñez, M. (2007). Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands. Zootaxa, 1482: 1-23. Auckland.