original description
(of Helix extensa O. F. Müller, 1774) Müller, O. F. (1773-1774). Vermium terrestrium et fluviatilium, seu animalium infusoriorum, helminthicorum, et testaceorum, non marinorum, succincta historia. <em>Havniæ et Lipsiæ.</em> Vol. 1, Pars Ima: 1-136 [1773]; Pars Altera: 1-72 + index 8 pp. [1774]. Havniæ (Copenhagen) & Lipsiæ (Leipzig), Heineck & Faber., available online at https://www.biodiversitylibrary.org/item/50344
page(s): 60 [details]
basis of record
Pilsbry, H. A. (1891-1892). <i>Manual of conchology, structural and systematic, with illustrations of the species</i>. Ser. 2, Pulmonata. Vol. 7: Helicidae, vol.5. pp 1-225, pls 1-61. Philadelphia, published by the Conchological Section, Academy of Natural Sciences. [pp. 1-64, pls. 1-15, Aug. 3, 1891; pp. 65-128, pls. 16-30, Nov. 3, 1891; pp. 129-192, pls. 31-45, Jan. 30, 1892; pp. 193-225, pls. 46-61, Apr. 25, 1892]. , available online at https://biodiversitylibrary.org/page/1102230
page(s): 114, pl. 27, figs. 9-11 [details]
From editor or global species database
Additional information Pilsbry (1892: 114) gives the locality of Island of Goram [Malukku Islands]. [details]