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 Author Alonso, María R. Author Ibáñez, Miguel text Zootaxa 2007 1482 1 23 journal article 10.5281/zenodo.176897 85773b3a-9274-4a30-ad96-ae4b27cc0ea5 1175-5326 176897 Genus Hemicycla Swainson Type species (by monotypy): Helix plicaria Lamarck, 1816 .