original description(ofHelix (Helicogena) undata 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 athttps://www.biodiversitylibrary.org/page/13265840 page(s): 41, pl. 5 fig. 5 [details]
Present Inaccurate Introduced: alien Containing type locality