Figure 1 from: Brincalepe Salvador R, Cavallari DC (2020) Taxonomy and distribution of enigmatic "helicoid" Polygyratia Gray, 1847 (Gastropoda, Stylommatophora). Zoosystematics and Evolution 96(1): 91-101. https://doi.org/10.3897/zse.96.51047

Figure 1 Shells of Polygyratia polygyrata, showing the variation in conchological characters such as size, number of whorls and aperture shape, as well as colouration. Scale bar = 2 cm. A. Holotype, NHMW-MO-14371 (NHMW). B.AMNH 43887 (AMNH). C.AMNH 119005 (AMNH). D.SMF 26248 (SMF). E. Example of a weathered specimen, which acquires a washed-off ochre/brown colouration, MNZ M.233517 (MNZ). F. Possible holotype of Polygyratia charybdis, NHMD 615842 (NHMD).