The freshwater molluscs of Serbia: Annotated checklist with remarks on distribution and protection status Author Marković, Vanja Author Gojšina, Vukašin Author Novaković, Boris Author Božanić, Milenka Author Stojanović, Katarina Author Karan-Žnidaršič, Tamara Author Živić, Ivana text Zootaxa 2021 2021-07-16 5003 1 1 64 journal article 218052 10.11646/zootaxa.5003.1.1 aceedc3f-3f24-490c-8046-7528c30aac10 1175-5326 5120059 8C98CC0B-18AF-418A-A794-AA3CA9CB7409 35. Valvata cristata O. F. Müller, 1774 Findings in Serbia . Valvata cristata : Hesse (1929) ; Karaman (2001); Paunović et al. (2007a) ; Martinović-Vitanović et al. (2013) . Common name . Crested valve snail, flat valve snail. Morphology . Minute snails up to 3.5 mm long/wide. Shell is flat, transparent, and consists of three whorls. Aperture is circular in shape, umbilicus is wide. For more details see Welter-Schultes (2012: 42 , figure at the bottom of the page). Distribution and ecology . European species, known from Turkey and Iran as well ( Glöer 2019 ). Inhabits a wide variety of habitats, including permanent and temporary flowing and standing waters. Prefers a muddy substrate, submerged vegetation and higher carbonate levels. In Serbia , it was recorded only from the Danube, with most localities in the Iron-Gate area. Other remarks . Despite its wide distribution and its eutrophication tolerance, it is considered vulnerable, or even endangered, due to pronounced habitat degradation in some regions, ( Welter-Schultes 2012 ). On the IUCN Red List it has been assessed as LC ( Vavrova 2011 e ).