original description
(of Helix involuta L. Pfeiffer, 1845) Pfeiffer, L. (1845). Description of twenty-two new species of land-shells, belonging to the collection of Mr. H. Cuming. <em>Proceedings of the Zoological Society of London.</em> 13(147): 63–68. London [30 September]., available online at https://www.biodiversitylibrary.org/page/12862559
page(s): 65 [details]
original description
(of Helix powisiana L. Pfeiffer, 1848) Pfeiffer, L. (1847-1848). <i>Monographia Heliceorum viventium. Sistens descriptiones systematicas et criticas omnium huius familiae generum et specierum hodie cognitarum</i>. Volumen primum. (1): 1–160 [1847, < 8 September]; (2): 161–320 [1847, > 27 September]; (3): i–xxxii, 321–484 [1848, < 23 June]. Lipsiae: F. A. Brockhaus., available online at https://www.biodiversitylibrary.org/page/52331607
page(s): 34 [details]
basis of record
Bland, T. (1875). Notes on certain terrestrial mollusks, with descriptions of new species. <em>Annals of the Lyceum of Natural History of New York.</em> 11: 72-87., available online at https://www.biodiversitylibrary.org/page/16076337
page(s): 78-79; note: As Guesteria powisiana Pfr. (incorrect genus spelling). [details]
additional source
Breure, A. S. H., Roosen, M. T. & Ablett, J. D. (2022). Land and freshwater molluscs of mainland Ecuador: an illustrated checklist. <em>Iberus.</em> 40(1): 1-290.
page(s): 104, figs. 131, 136 [details]
From editor or global species database
Etymology Named for the French shell collector, ---- Powis (18**-18**). [details]