Helicodonta obvoluta obvoluta (O. F. Mueller , 1774)

Plazzi, Federico & Pedroni, Guido, 2023, Biodiversity of extant snails (Gastropoda, Mollusca) in the Pliocene Mountain Spur Natural Reserve (Northern Apennine, Italy), Biodiversity Data Journal 11, pp. 95688-95688 : 95688

Helicodonta obvoluta obvoluta (O. F. Mueller, 1774)

Materials

Type status: Other material. Occurrence : recordedBy: Pedroni ; individualCount: 1; occurrenceID: E428237B-B8A9-5F14-ACAE-0B5723E39376; Location : country: Italy; locality: Monte del Frate (4), PMS, Setta Valley ; verbatimElevation: 335 m; Identification : identifiedBy: Pedroni; Event: eventDate: 5.IX.2021

Notes

Shell medium-sized to small, hairy; umbilicus open; ranging from dark brown to brown; flattened above; peristome flattened; lips somewhat thick, white, with a callus in the aperture with three lobes. This subspecies is found in forests under fallen branches, leaf litter and between stones, usually on calcareous substrate; in the Alps, it may reach 1,900 m, but is rarely found above 1,500 m ( Kerney and Cameron 1979, Giusti et al. 1985, Welter-Schultes 2012). It may weakly climb up tree trunks and hibernates in rotting wood logs ( Welter-Schultes 2012). Hairs on the shell can reach 1 mm in length and are usually permanent ( Welter-Schultes 2012).

The collection site of the present specimen is of particular interest, at the base of sandstone outcrops in a small, moist dell with abundant vegetation - a site which may represent a refugial micro-environment with respect to ecological features of this subspecies.