original description(ofHelix adela Westerlund, 1874)Westerlund, C. A. (1874). Malakologische Studien, Kritiken und Notizen. I-IX. <em>Malakozoologische Blätter.</em> 22: 51-82, pl. 2. Cassel. page(s): 57, pl. 2, figs. 1-4 [details]
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