MolluscaBase taxon details
original description
(of Helix (Epistylia) Swainson, 1840) Swainson, W. (1840). A treatise on malacology; or the natural classification of shells and shell-fish. Longman, London, viii + 419 pp., available online at http://www.biodiversitylibrary.org/item/33450
page(s): 165, 166, 331 [details]
original description
(of Parahelix Ihering, 1892) Ihering, H. von. (1892). Morphologie und Systematik des Genitalapparates von <i>Helix</i> (Zweiter Theil.). <em>Zeitschrift für Wissenschaftliche Zoologie.</em> 54 (3): 425-520. [4 October]., available online at https://www.biodiversitylibrary.org/page/43282312
page(s): 492 [details]
original description
(of Helix (Sagda) H. Beck, 1837) Beck, H. (1837-1838). <i>Index molluscorum praesentis aevi musei principis augustissimi Christiani Frederici</i>. 124 pp. Hafniae [Copenhagen]. Pp. 1-100 [1837]; 101-124 [1838]; Appendix: 1-8 [June 1837]. , available online at https://biodiversitylibrary.org/page/32058074
page(s): 9 [details]
basis of record
Baker, H. B. (1940). Some Antillean Sagdidae or Polygyridae. <em>The Nautilus.</em> 54(2): 54-62, pls. 4-5., available online at https://www.biodiversitylibrary.org/page/8519205
page(s): 61 [details]
additional source
Baker, H. B. (1950). Subdivisions of <i>Sagda</i>. <em>The Nautilus.</em> 64(1): 36., available online at https://www.biodiversitylibrary.org/page/8524297 [details]