François Roffiaen's terrestrial and freshwater gastropod types in the collection of the Royal Belgian Institute of Natural Sciences Author Salvador, Rodrigo Brincalepe 0000-0002-4238-2276 Zoology Unit, Finnish Museum of Natural History, University of Helsinki, Pohjoinen Rautatiekatu 13, 00100 Helsinki, Finland Author d'Udekem d'Acoz, Cedric 0000-0002-7893-305X Scientific Heritage Service, Partim Recent Invertebrates Collections, Royal Belgian Institute of Natural Sciences, Rue Vautier 29, 1000 Brussels, Belgium Author Vinarski, Maxim V. 0000-0002-7644-4164 Saint-Petersburg State University, University Embankment 7 / 9, 199034 Saint-Petersburg, Russia Author Samyn, Yves 0000-0002-1653-3018 Scientific Heritage Service, Partim Recent Invertebrates Collections, Royal Belgian Institute of Natural Sciences, Rue Vautier 29, 1000 Brussels, Belgium Author Tomotani, Barbara Mizumo 0000-0002-8855-4803 Zoology Unit, Finnish Museum of Natural History, University of Helsinki, Pohjoinen Rautatiekatu 13, 00100 Helsinki, Finland & Arctic Chronobiology and Physiology Research Group, Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Framstredt 41 - 42, 9019 Tromsø, Norway text ZooKeys 2025 2025-05-21 1239 103 121 journal article 309945 10.3897/zookeys.1239.150840 787ed834-688a-41e4-9abb-da2df5fa0876 F94E6089-E39F-4DAB-BA0F-C98DB50ACE07 Clausilia plicatula var. albinos Roffiaen, 1868 Clausilia plicatula var. albinos Roffiaen, 1868: 76 . Type material. Single specimen, at present not located. Type locality. Switzerland : Iseltwald. Taxonomic status. Junior synonym of Macrogastra plicatula plicatula (Draparnaud, 1801) . Discussion. No specimens belonging to this taxon were found. The original description mentioned a single shell, whitish and transparent (hence, “ albinos ”), as belonging to this variety, while commenting that the nominate form is common and very variable ( Roffiaen 1868: 76 ). Thus, this variety based on an albino specimen (or otherwise presenting partial or total loss of pigments) can be considered synonymous with the nominate form. Macrogastra plicatula is widespread in Europe, including many records in the area encompassing Iseltwald representing M. p. plicatula ( Turner et al. 1998 ; Nordsieck 2006 ).