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 64. Hippeutis complanatus ( Linnaeus, 1758 ) Findings in Serbia . Hippeutis complanatus : Hesse (1929) ; Karaman (2001); Karaman & Karaman (2007) ; Novaković (2016 pers. comm.); Gojšina (2021 pers. comm.). Common name . Flat ramshorn. Morphology . Small snails, up to 5 mm diameter. Flattened and shiny translucent shell is finely striated and consists of 3–4 rapidly increasing whorls. The last whorl is large and medial keeled. Umbilicus is 1/6–1/4 of shell diameter. For more details see Welter-Schultes (2012: 65 , figure at the bottom of the page). Distribution and ecology . Holarctic species up to 1100 m .a.s.l. Inhabits stagnant and slow-flowing waters rich in vegetation. Does not tolerate droughts ( Welter-Schultes 2012 ). Rare in Serbia , it was recorded in the Danube, Jezava and Plazović Rivers, and a small pond near the Nera River ( Bela Crkva Municipality). Other remarks . Due to threatened and polluted habitats the species has scarce findings across its distribution range. Considered as vulnerable species in Austria and Switzerland ( Welter-Schultes 2012 ). On the IUCN Red List it has been assessed as LC ( Killeen & Seddon 2011 b ). Genus Segmentina J. Fleming, 1818