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 71. Musculium lacustre (O.F. Müller, 1774) Findings in Serbia . Sphaerium lacustre : Paunović et al. (2008) ; Martinović-Vitanović et al. (2013) . Musculium lacustre : Tomović et al . (2014) . Common name . Lake (or capped) orb mussel. Morphology . Small bivalve. Shell is very thin and fragile with quadrangular outline and prominently raised, narrow umbos. Dimensions are length 7–10 mm , height 7–8 mm , and depth 4–5 mm . For more details see Welter-Schultes (2012: 18, figure on the top of the page). Distribution and ecology . The species has a Holarctic distribution range ( Graf & Cummings 2021 ). It occurs in rivers and canals, but more frequently occurring in swamps and ponds with a domination of muddy substrates, or occasionally with dense vegetation cover ( Seddon et al. 2017 ). In Serbia . it was recorded in the Danube. Other remarks . There are 40 nominal species known as synonyms ( Graf & Cummings 2021 ). It has been assessed as LC on the IUCN Red List (Kebapçý et al . 2011). Genus Pisidium C. Pfeiffer, 1821