Alien land snail species in the Western Palaearctic Region A Novisuccinea ovalis (Say, 1817), Israel, Haifa (iNaturalist observation 118548596, courtesy of O. Shabbiel Lebber-Shabbat) B Succinea (Calcisuccinea) sp., Portugal, Seixal (iNaturalist observation 92683866, courtesy of N. Veríssimo P.) C Naesiotus quitensis (Pfeiffer, 1848), Spain, Madrid, Casa de Campo Park (reproduced from Ramos Sánchez et al. (2018), courtesy of J. López-Soriano) D Gastrocopta pellucida (Pfeiffer, 1841), Dominican Republic, Guaraguo (ZMH 51838) E Gastrocopta procera (Gould, 1840), Turkey, Evrenseki (reproduced from Frank (2016), courtesy of C. Frank) F Gastrocopta rupicola (Say, 1821), USA, Texas, San Marcos, Spring Lake Hills (iNaturalist observation 17346779, courtesy of B. Hutchins) G Gastrocopta sterkiana Pilsbry, 1917, Israel, En Gedi (ZMH 69886) H Zonitoides arboreus (Say, 1817), Canary Islands, Tenerife, Bajamar (ZMH 145645) I Hawaiia minuscula (Binney, 1841), Canary Islands, Tenerife, Puerto de la Cruz (ZMH 99003) J Guppya gundlachii (Pfeiffer, 1840), Peru, Huánuco, reserva Panguana (ZMH 143639) K Polygyra cereolus (Megerle von Mühlfeld, 1816), Egypt, Cairo, El Zamalek (ZMH 75229). Scale bars: 5 mm (C); 0.5 mm (D–G); 1 mm (H–K).