Lucilla singleyana (Pilsbry, 1890) (Gastropoda: Pulmonata: Punctidae) in recent flood debris in the Beskidy Mts (Southern Poland)

Mollusc thanatocoenoses are common components of flood debris in river valleys. Several localities with such sediments, found in the Beskidy Mts, were studied in detail. Their thanatocoenoses comprise a very rich fauna of molluscs, especially land snails. Almost three hundred specimens of Lucilla singleyana (Pilsbry) were found in the whole investigated material; more than 150 adult shells were selected for biometrical analysis. L. singleyana has been recorded from several European countries, but its localities are few and isolated. Its geographical range is probably much wider and may extend throughout Central and Western Europe, except high mountains, but, being a small subterranean snail, it is difficult to find. Detailed examination of mollusc shells in flood debris seems to be the best way to ascertain the geographical range of the species.