Unio athesinus Adami, 1886 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio benacinus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio bourguignatianus Adami, 1886 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio brachyrhynchus Drouët, 1881 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio brianteus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio ceratinus Drouët, 1879 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio corrosus A. Villa & J. B. Villa, 1841 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio cristophori Adami, 1886 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio cusianus Pini, 1885 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio dalmaticus Drouët, 1879 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio decipiens Drouët, 1881 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio delpretei Bourguignat, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio directus Drouët, 1896 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio elongatulus C. Pfeiffer, 1825 (taxonomy source)
Unio elongatulus C. Pfeiffer, 1825 (subsequent type designation)
Unio eucallistellus Bourguignat, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio fiscallianus Kobelt, 1873 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio fluminalis Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio glaucinus Porro, 1838 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio gredleri Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio gurkensis Bourguignat, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio humerosus Westerlund, 1890 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio humerosus var. elongata Kobelt, 1914 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio humerosus var. roboretana Kobelt, 1914 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio idrinus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio istrianus Stossich, 1899 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio kleciaki Drouët, 1879 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio lijacensis Kobelt, 1890 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio lijacensis var. gallensteini Kobelt, 1890 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio limosus var. arcensis Gredler, 1894 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio limosus var. costanus Gredler, 1894 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio limosus var. madranus Gredler, 1894 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio limosus var. monticellensis Gredler, 1894 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio limosus var. trilacensis Gredler, 1894 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio longobardus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio mancus Lamarck, 1819 (taxonomy source)
Unio mancus mancus Lamarck, 1819 (basis of record)
Unio mancus requienii Michaud, 1831 (basis of record)
Unio mancus turtonii Payraudeau, 1826 (basis of record)
Unio minusculus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio morlachicus Kobelt, 1914 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio nitidus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio opisodartos Adami, 1882 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio ovalis var. intercedens Gredler, 1860 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio padanus Bourguignat, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio pallens Rossmässler, 1842 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio palustris Drouët, 1896 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio petrovichii Küster, 1854 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio petterianus Küster, 1854 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio piccinellii Adami, 1886 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio pictorum var. parva Stabile, 1845 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio requienii var. blauneri Stabile, 1859 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio requienii var. oriliensis Stabile, 1859 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio requienii var. sebinensis Adami, 1876 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio requienii var. vulgaris Stabile, 1859 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio robustus Drouët, 1879 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio ruffonii Adami, 1886 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio rusticus Pini, 1885 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio sandrii Rossmässler, 1844 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio sandrii var. sericatus Rossmässler, 1844 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio segregatus Drouët, 1896 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio siliquatus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio spinellii Spinelli, 1852 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio stephaninii Adami, 1882 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio strobeli Bourguignat, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio subcylindricus Drouët, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio succineus Drouët, 1881 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio thermalis Drouët, 1896 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio tommasii Adami, 1886 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio veillanicus Bourguignat, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio verbanicus Bourguignat, 1883 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)
Unio viridiflavus Küster, 1854 accepted as Unio elongatulus C. Pfeiffer, 1825 (source of synonymy)

Croatia for Unio sandrii var. sericatus Rossmässler, 1844 

 Type locality

 for Unio elongatulus C. Pfeiffer, 1825

Vipava (=Vipacco) River near Gabria Inferiore (province of Gorizia, Italy) - the locality of the neotype [details]