Valvata macrostoma Mörch, 1864

Marković, Vanja, Gojšina, Vukašin, Novaković, Boris, Božanić, Milenka, Stojanović, Katarina, Karan-Žnidaršič, Tamara & Živić, Ivana, 2021, The freshwater molluscs of Serbia: Annotated checklist with remarks on distribution and protection status, Zootaxa 5003 (1), pp. 1-64 : 21

36. Valvata macrostoma Mörch, 1864

Findings in Serbia.

Valvata pulchella : Hesse (1929); Jaeckel et al. (1958); Karaman (2001); Karaman & Karaman (2007); Martinović-Vitanović et al. (2013); Gojšina (pers. comm. 2021).

Common name. Bog valve snail, large-mouthed valve snail.

Morphology. Minute snails up to 5 mm long/wide. Shell has depressed, small spire, whorls are rapidly increasing, umbilicus is wide. For more details see Welter-Schultes (2012: 43, figure at the bottom of the page).

Distribution and ecology. European-Siberian lowland species ( Glöer 2019). Prefers muddy and sandy substrate of slow–flowing or standing waters. In Serbia, most records are from the Danube. There are also records from Zasavica Wetland (Sremska Mitrovica Municipality), Jezava River (Smederevo Municipality) and Petnica Lake (Valjevo Municipality).

Other remarks. Despite its wide distribution range, the species is rare and endangered in some regions due to habitat destruction. It is critically endangered in Switzerland, Czech Republic and Germany, and endangered in Austria and the Netherlands; vulnerable in Poland and England ( Welter-Schultes 2012). On the IUCN Red List it has been assessed as LC, yet with decreasing population trend ( Fehér 2011 c).