Alonso MR, Ibáñez M.

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 [Internet]. 2007 May 24 [cited 2025 Jun. 7];1482(1):1–23. Available from: https://www.mapress.com/zt/article/view/zootaxa.1482.1.1