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 72. Pisidium amnicum (O.F. Müller, 1774) Findings in Serbia . Pisidium amnicum : Tomović et al. (2010 b , 2014 ); Popović et al. (2020) . Common name . River pea mussel Morphology . Small bivalve. The oval rounded shell with rounded umbo lying posterior of the midpoint. It reaches 11 mm in length, 7 mm in height, and 6 mm in depth. For more details see Welter-Schultes (2012: 18 , figure at the bottom of the page). Distribution and ecology . Palearctic species occurring throughout most of Europe. It has been introduced to the eastern part of North America and Africa ( Moorkens & Killeen 2009 ; Graf & Cummings 2021 ). Inhabits muddy and silty substrate in a wide range of lowland habitats such as streams, rivers, canals and large drainage ditches ( Moorkens & Killeen 2009 ). In Serbia , it was found in the Danube. Other remarks . This is the largest species of Pisidium occurring in Europe. It has 15 nominal species used as synonyms ( Graf & Cummings 2021 ). It has LC status on the IUCN Red List ( Van Damme et al . 2011).