original description
(of Helix (Helicella) bifrons R. T. Lowe, 1831) Lowe, R. T. (1831). Primitiae faunae et florae Maderae et Portus Sancti; sive species quaedam novae vel hactenus minus rite cognitae animalium et plantarum in his insulis degentium breviter descriptae. <em>Transactions of the Cambridge Philosophical Society.</em> 4 (1): 1-70, pl. 1-6. Cambridge., available online at https://www.biodiversitylibrary.org/page/13265840
page(s): 46-47, pl. 5 fig. 18 [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]
additional source
Cameron, R. A. D., Teixeira, D., Pokryszko, B., Silva, I. & Groh, K. (2021). An annotated checklist of the extant and Quaternary land molluscs of the Desertas Islands, Madeiran Archipelago. <em>Journal of Conchology.</em> 44(1): 53-70.
page(s): 59 [details] Available for editors [request]
additional source
Pilsbry, H. A. (1947). On the anatomy and the systematic place of the land-mollusk genus <i>Janulus</i>. <em>The Nautilus.</em> 60(3): 94-97, pl. 7, figs. 1-5., available online at https://www.biodiversitylibrary.org/page/8523777 [details]
From editor or global species database
From other sources