Traits taxon details
original description
(of Helix declivis F. Sandberger, 1870 †) Sandberger, C.L.F. (1870-1875). <i>Die Land- und Süßwasser-Conchylien der Vorwelt</i>. C. W. Kreidel, Wiesbaden. [pp. 1-96, pl. 1-12 (1870); pp. 97-160, pl. 13-20 (1871); pp. 161-256, pl. 21-32 (1873); pp. 257-352, pl. 33-36 (1874); pp i-viii, 353-1000 (1875) according to Woodward, 1906]. , available online at https://biodiversitylibrary.org/page/49567154 page(s): pl. 12, fig. 12; note: description on p. 245 appeared in 1872 [details] 
original description
(of Helix (Chloraea) proserpina Oppenheim, 1890 †) Oppenheim, P. (1890). Die Land- und Süsswasserschnecken der Vicentiner Eocänbildungen. Eine paläontologisch-zoographische Studie. <em>Denkschriften der mathematisch-naturwissenschaftlichen Classe der Kaiserlichen Akademie der Wissenschaften.</em> 57: 113-150., available online at https://www.biodiversitylibrary.org/page/7128848 page(s): 121, pl. 1, figs 8a-d [details]
basis of record
Nordsieck, H. (2014). Annotated check-list of the genera of fossil land snails (Gastropoda: Stylommatophora) of western and central Europe (Cretaceous – Pliocene), with description of new taxa. <em>Archiv für Molluskenkunde.</em> 143(2): 153-185., available online at https://doi.org/10.1127/arch.moll/1869-0963/143/153-185 page(s): 166 [details]
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