MolluscaBase taxon details
original description
(of Clausilia gracilis var. subclavata L. Pfeiffer, 1859) Pfeiffer, L. (1859). Monographia Heliceorum viventium. Sistens descriptiones systematicas et criticas omnium huius familiae generum et specierum hodie cognitarum. Volumen quartum. (1): 1–352 [January or February]; (2): 353–920, i–ix [< November]. Lipsiae: F.A. Brockhaus., available online at https://www.biodiversitylibrary.org/page/11648889 page(s): 756 [details]
original description
(of Clausilia approximans A. Schmidt, 1856) Schmidt, A. (1856). Die kritischen Gruppen der Europäischen Clausilien, I. Abtheilung. VI + 63 pp., 11 pls.; Leipzig (Costenoble). page(s): 35 [details] 
original description
(of Clausilia subgracilis A. Schmidt, 1852) Schmidt, A. (1852). Malakologische Mittheilungen. Zeitschrift für Malakozoologie, 8 (12): 179-192. Cassel., available online at https://www.biodiversitylibrary.org/page/16300679 page(s): 188 [details]
basis of record
Bank, R. A.; Neubert, E. (2017). Checklist of the land and freshwater Gastropoda of Europe. Last update: July 16th, 2017. [details] 
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