MolluscaBase taxon details
original description
(of Helix jonasi L. Pfeiffer, 1846) Pfeiffer, L. (1846). Descriptions of thirty-six new species of <i>Helix</i>, belonging to the collection of H. Cuming, Esq. <em>Proceedings of the Zoological Society of London.</em> 13: 126-133 ("1845")., available online at https://www.biodiversitylibrary.org/page/12862622 page(s): 126 [details]
original description
(of Helix albersi L. Pfeiffer, 1849) Pfeiffer, L. (1849). Nachträge zu L. Pfeiffer Monographia Heliceorum. <em>Zeitschrift für Malakozoologie. Cassel (Theodor Fischer).</em> 6 (4): 66-79 [30 November 1849]; 6 (6): 81-95 [30 November 1849]; 6 (7): 106-112 [31 Dezember 1849]., available online at https://biodiversitylibrary.org/page/16300164 page(s): 86 [details]
basis of record
Richardson, L. (1983). Bradybaenidae: Catalog of species. <em>Tryonia.</em> 9: 1-253., available online at https://www.biodiversitylibrary.org/page/57458375 page(s): 181 [details]
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