original description
(of Hemicycla bituminosa var. unicolor Gude, 1896) Gude, G. K. (1896). Description of a new species of <i>Vitrina</i>, and new forms of Helicidae, with a list of the helicid shells hitherto found in the Canary Islands. <em>Proceedings of the Malacological Society of London.</em> 2: 15-22., available online at https://www.biodiversitylibrary.org/page/15036393
page(s): 16 [details]
original description
(of Helix bituminosa Mabille, 1883) Mabille, J. (1883). Sur quelques espèces de mollusques terrestres. <em>Bulletin de la Société Philomatique de Paris.</em> ser. 7, 7(1): 39-53., available online at https://www.biodiversitylibrary.org/page/31636533
page(s): 50-51 [details]
basis of record
Bank, R. A.; Neubert, E. (2017). Checklist of the land and freshwater Gastropoda of Europe. Last update: July 16th, 2017. [details]
From editor or global species database
From other sources