The taxonomic and nomenclatural status of Oxychilus adamii (Westerlund, 1886) and O. polygyra (Pollonera, 1885) is revised. These two, very similar species are tentatively assigned to Mediterranean a ‘subgenus’ of Oxychilus characterized by (1) absent or very short flagellum; (2) penial retractor inserted where epiphallus ends and proximal penis begins; (3) internal ornamentation of penis consisting of pleats and rows of papillae, some of which or all with apical thorn; (4) short epiphallus internally with series of transverse crests on one side and a few slender longitudinal pleats on the other; (5) mucous gland forming muff of glandular tissue, denser and yellower around distal portion of free oviduct; (6) and short mesocone on the central tooth. O. adamii is distinguished by a medium-sized shell (diameter 16.1 ± 1.0 mm) and very small papillae without apical thorn covering the initial portion of the proximal penis. O. polygyra is distinguished by a small shell (diameter 10.4 ± 0.5 mm) and large papillae with an evident cuticularized apical thorn covering the initial portion of the proximal penis. The paper concludes with a review of the current status of Oxychilus taxonomy, including the main problems and some tentative solutions to be verified in the context of individual revisions.

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Nederlandse Malacologische Vereniging

F. Giusti, & G. Manganelli. (1999). Redescription of two problematic Alpine Oxychilus: O. adamii (Westerlund, 1886) and O. polygyra (Pollonera, 1885) (Pulmonata, Zonitidae). Basteria, 63(1/3), 27–60.