Unio tumidus Retzius, 1788
Philipsson in Retzius, 1788. Diss. Nat.-Hist. Test. Gen.: 17.

Unio (sec. Lymnium) tumidus — Simpson (1900), Simpson (1914)
Unio (Groupe Tumidusiana) tumidus — Caziot (1907)
Unio tumidus — Germain (1908), Kobelt & Haas (1910), Ortmann (1912), Ortmann (1914), Germain (1931), ... Wu et al. (2024), Dai et al. (2024), Wu et al. (2024), Hou et al. (2024), Dai et al. (2025)
Unio (s.s.) tumidus — Zhadin (1938), Vinarski & Kantor (2016)
Unio tumidus tumidus — Haas (1940), Haas (1969), Fauna Europaea (2012), Lopes-Lima et al. (2017), Bogatov (2022)
Unio (Tumidusiana) tumidus — Zatravkin (1983), Korniushin (1998)
Unio (s.s.) tumidus tumidus — Falkner et al. (2001), Falkner et al. (2002)
Tumidiana tumida — Starobogatov et al. (2004)
Tumidiana tumida tumida — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio tumidu [sic] — Li et al. (2010)

Unio conus Spengler, 1793
Lister, 1685. Conch.: pl. 146, fig. 1. [pre-linnaean]
Spengler, 1793. Skr. Naturhist. Selsk. 3: 60, no. 26.

Unio (sec. Lymnium) pictorum — Simpson (1900), Simpson (1914)
Unio tumidus — Germain (1931), Graf (2007), IUCN (2011), Klishko et al. (2017), Bogatov et al. (2018), Anisimova et al. (2018)
Unio (s.s.) tumidus var. conus — Zhadin (1938)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (Tumidusiana) conus — Zatravkin (1983)
Tumidiana conus — Starobogatov et al. (2004)
Tumidiana conus conus — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio (s.s.) conus — Vinarski & Kantor (2016)
Unio tumidus conus — Bogatov (2022)

Mya depressa Donovan, 1801
Donovan, 1801. Brit. Shells 3: pl. 101.

Unio (sec. Lymnium) tumidus — Simpson (1900), Simpson (1914)
Unio tumidus tumidus — Haas (1940), Lopes-Lima et al. (2017)
— Haas (1969)
Unio (s.s.) tumidus depressus — Falkner et al. (2001), Falkner et al. (2002)
Unio tumidus — Prié & Puillandre (2014)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Mya ovata Donovan, 1802
Donovan, 1802. Brit. Shells 4: pl. 122.

Unio (sec. Lymnium) tumidus — Simpson (1900), Simpson (1914)
Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969), Fauna Europaea (2012)

Mya ovalis Montagu, 1803
Philipsson in Retzius, 1788. Diss. Nat.-Hist. Test. Gen.: 17.
Pultney, 1799. Cat. Birds. Shells. Dorsetshire: 27. [nomen nudum]
Montagu, 1803. Test. Brit. (1): 34.
(misidentified reference to Mya ovalis Lightfoot, 1786)

Unio (sec. Lymnium) tumidus — Simpson (1900), Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Tumidiana conus conus — Kantor & Sysoev (2005)
Unio tumidus — Klishko et al. (2017)

Mysca solida Turton, 1822
Montagu, 1803. Test. Brit. (1): 36 [as ‘Mya solida’].
Turton, 1822. Conch. Ins. Brit.: 246, pl. 16, fig. 2.

Unio (sec. Lymnium) tumidus — Simpson (1900), Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio inflata Hecart, 1833
Hecart, 1833. Mém. Soc. Agricult. Valanciennes 1: 245.
(homonym of Unio inflatus Studer, 1820)

Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio muelleri Rossmässler, 1838
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 41, pl. 40, fig. 541.
Rossmässler, 1842. Icon. Land- und Süssw.-Moll. 2 (5): 13, pl. 54, fig. 739.

Unio (sec. Lymnium) tumidus — Simpson (1900), Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) muelleri — Zatravkin (1983), Stadnichenko (1984), Vinarski & Kantor (2016)
Tumidiana muelleri — Starobogatov et al. (2004), Kantor & Sysoev (2005), Kantor et al. (2010)
Unio tumidus — Graf (2007), IUCN (2011), Klishko et al. (2017)

Unio tumidus var. radiatus Colbeau, 1839
Colbeau, 1839. Matér. Faune Malacol. Belg.: ??.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio pictorum Brown, 1844
Brown, 1844. Ill. Rec. Conch.: 81, pl. 31, figs. 8-11.
(misidentified reference to Mya pictorum Linnaeus, 1758)

Unio (sec. Lymnium) tumidus — Simpson (1900), Simpson (1914)

Unio tumidus var. corrosus Zelebor, 1851
Zelebor, 1851. Ber. Mit. Freunde Naturw. Wien 7: 230, sp. 7.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788; homonym of Unio corrosus Villa, 1841)

Unio tumidus tumidus — Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. solidus Zelebor, 1851
Zelebor, 1851. Ber. Mit. Freunde Naturw. Wien 7: 230, sp. 6.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788; homonym of Unio solidus Lea, 1838)

Unio tumidus tumidus — Haas (1969)

Unio limaniae Dupuy, 1852
Bouill., 1836. Cat. Moll. Auv.: 81. [nomen nudum]
‘Bouillet’ Dupuy, 1852. Hist. Natur. Moll. France (6): 653 [as ‘limaniæ’].

Unio tumidus var. lacustris Rossmässler, 1854
Rossmässler, 1854. Icon. Land- und Süssw.-Moll. 13: no. 16.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio pictorum var. niger de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 294, pl. 12, fig. 2.
(intro'd as intra-sp. of Mya pictorum Linnaeus, 1758; homonym of Unio (Elliptio) nigra Rafinesque, 1820)

Unio (Rostratiana) niger — Germain (1904)
Unio tumidus — Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio pictorum var. vinceleus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 294, pl. 12, figs. 4-5.
(intro'd as intra-sp. of Mya pictorum Linnaeus, 1758; renamed Unio vinceloti Germain, 1904)

Unio (Vincelotiana) vinceloti — Germain (1904)
Unio (Groupe des Vincelensiana) [sic] vincelens [sic] — Caziot (1907)
Unio tumidus — Germain (1931), Prié & Puillandre (2014)
Unio pictorum rostratus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus vinceleus — Falkner et al. (2001), Falkner et al. (2002)
Unio (s.s.) rostrata — Vinarski & Kantor (2016)
Unio tumidus tumidus — Lopes-Lima et al. (2017)

Unio tumidus var. saccatus Rossmässler, 1859
Rossmässler, 1859. Icon. Land- und Süssw.-Moll. 3 (5-6): 138, pl. 89, fig. 969.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

— Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (Tumidusiana) tumidus var. saccatus — Stadnichenko (1984)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio conus compressa Mörch, 1863
Mörch, 1863. Vidensk. Medd. Naturhist. Foren. Kjöben. (17-22): 340.
(intro'd as intra-sp. of Unio conus Spengler, 1793; homonym of Unio compressus Rafinesque, 1831)

Unio conus compressissima Mörch, 1863
Mörch, 1863. Vidensk. Medd. Naturhist. Foren. Kjöben. (17-22): 340.
(intro'd as intra-sp. of Unio conus Spengler, 1793; homonym of Unio compressissimus Lea, 1845)

Unio pictorum maxima Mörch, 1863
Mörch, 1863. Vidensk. Medd. Naturhist. Foren. Kjöben. (17-22): 340.
Mörch, 1864. Syn. Moll. Daniae: 78.
(intro'd as intra-sp. of Mya pictorum Linnaeus, 1758)

Unio tumidus var. maximus — Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus limicola Mörch, 1863
Mörch, 1863. Vidensk. Medd. Naturhist. Foren. Kjöben. (17-22): 339.
Mörch, 1864. Syn. Moll. Daniae: 77.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

— Simpson (1914)
Unio (s.s.) tumidus limicola — Zhadin (1938)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (Tumidusiana) tumidus var. limicola — Stadnichenko (1984)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus picta Mörch, 1863
Beck in Mörch, 1863. Vidensk. Medd. Naturhist. Foren. Kjöben. (17-22): 339.
Mörch, 1864. Syn. Moll. Daniae: 77.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788; homonym of Unio pictus Lea, 1834)

Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio robianoi Malzine, 1867
Malzine, 1867. Essai faun. malac. Belg.: 33, pl. 1, fig. 1-2.

Unio robianoi var. inflatus Malzine, 1867
Malzine, 1867. Essai faun. malac. Belg.: 33, pl. 1, fig. 3-4.
(homonym of Unio inflatus Studer, 1820; intro'd as intra-sp. of Unio robianoi Malzine, 1867)

Unio batavus var. incurvatus Colbeau, 1868
Colbeau, 1868. Ann. Soc. Malac. Belgique 3: 106, pl. 4, fig. 2.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)

Unio (Alpecanusiana) incurvatus — Germain (1904)
Unio tumidus — Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. heckingi Colbeau, 1868
Colbeau, 1868. Ann. Soc. Malac. Belgique 3: 106, pl. 4, fig. 1.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio tumidus — Germain (1908), Germain (1931)
— Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. borysthenensis Kobelt, 1879
Kobelt, 1879. Icon. Land- und Süssw.-Moll. 7: 32, pl. 192, fig. 1950.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788; renamed Unio tumidus var. borysthenicus Servain, 1888)

— Simpson (1914)
Unio tumidus borysthenensis — Haas (1940), Haas (1969), Fauna Europaea (2012)
Tumidiana conus borysthenensis — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio (s.s.) conus — Vinarski & Kantor (2016)
Unio tumidus borysthensis [sic] — Lopes-Lima et al. (2017)
Unio tumidus — Araujo et al. (2018)

Unio tumidus var. rohrmanni Kobelt, 1879
Kobelt, 1879. Icon. Land- und Süssw.-Moll. 7: 32, pl. 192, fig. 1951.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

— Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio gerstfeldtianus Clessin, 1880
Clessin, 1880. Nachr. Bl. Dtsch. Malak. Ges. 12: 81.

— Simpson (1914)
Unio (s.s.) tumidus var. gerstfeldtianus — Zhadin (1938)
Unio tumidus borysthenensis — Haas (1940), Haas (1969), Fauna Europaea (2012)
Unio tumidus var. gerstfeldtianus — Zhadin (1965)
Tumidiana tumida tumida — Kantor & Sysoev (2005)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio bardus Servain, 1881
Bourguignat, in sched. Servain, 1881. Malac. Lac Balaton: 98.
Bourguignat in Servain, 1888. Bull. Soc. Malac. France 5: 323.

Unio (Rostratiana) bardus — Germain (1904)
Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio tumidus var. falcatulus Drouët, 1881
Drouët, 1881. Unionidae Russie: 9.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

— Simpson (1914)
Unio tumidus borysthenensis — Haas (1940), Haas (1969)
Unio (Tumidusiana) tumidus falcatulus — Stadnichenko (1984)
Tumidiana tumida falcatulus — Kantor & Sysoev (2005)
Tumidiana tumida falcatula — Kantor et al. (2010)
Unio tumidus — IUCN (2011)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. minor Drouët, 1881
Drouët, 1881. Unionidae Russie: 9.
(homonym of Unio margaritifer var. minor Rossmässler, 1835)

Unio alpecanus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 285, 355.
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 177 [71].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 215.
Type(s): LECTOTYPE MNHN_22094 (by Graf, 2011: 457), l’Oise à Creil.

Unio tumidus — Germain (1908), Germain (1931)
— Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio edyus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 299, 367.
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 177 [71].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 215.

Unio tumidus — Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio fourneli Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 300, 367.
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 177 [71].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 214.
Type(s): IDIOTYPE MNHN_22225, La Marne à Lagny (Seine-et-Marne).

Unio tumidus — Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio schroederi Schröder, 1885
Bourguignat in Schröder, 1885. Bull. Soc. Malac. France 2: 224.

Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio rhenanus Kobelt, 1886
Kobelt, 1886. Jb. Nassau. Ver. Naturk. 39: 96, pl. 5, fig. 3.
Kobelt, 1886. Icon. Land- und Süssw.-Moll. 2: 48, pl. 56, fig. 297.

Unio tumidus rhenanus — Kobelt & Haas (1910)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. godetiana Clessin, 1887
Clessin, 1887. Moll.-Fauna Mitteleuropas 2: 738, text fig. 496.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus godetianus — Falkner et al. (2001)
Unio tumidus godetianus — Lopes-Lima et al. (2017)

Unio anabaenus Servain, 1888
Servain, 1888. Bull. Soc. Malac. France 5: 324 [as ‘anabænus’].

— Simpson (1914)

Unio mulierum Servain, 1888
Servain, 1888. Bull. Soc. Malac. France 5: 321.

Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio spengeli Servain, 1888
Bourguignat in Servain, 1888. Bull. Soc. Malac. France 5: 323.

Unio tumidus var. borysthenicus Servain, 1888
Kobelt, 1879. Icon. Land- und Süssw.-Moll. 7: 32, pl. 192, fig. 1950 [as ‘borysthenensis’].
‘Kobelt’ Servain, 1888. Bull. Soc. Malac. France 5: 323.
(new name for Unio tumidus var. borysthenensis Kobelt, 1879)

Unio (s.s.) tumidus var. borysthenicus — Zhadin (1938)
Unio tumidus var. borysthenicus — Zhadin (1965)
Unio (Tumidusiana) conus borysthenicus — Stadnichenko (1984)

Unio aldemaricus Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 176 [70], 262 [156].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 213.
Type(s): LECTOTYPE MNHN_22091 (by Graf, 2011: 456), l’Aisne, à Guignicourt (Ardennes).

Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio borcherdingi Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 153 [47].
(new name for Unio macrorhynchus Borcherding, 1889)

Unio tumidus tumidus — Haas (1969)

Unio giberti Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 131 [25], 191 [85].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 215, fig. 227.
Type(s): LECTOTYPE MNHN_22237 (by Graf, 2011: 477), La Marne à Lagny (Seine-et-Marne).

Unio tumidus — Germain (1908), Germain (1931)
— Simpson (1914)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio macrorhynchus Borcherding, 1889
Borcherding, 1889. Abh. Naturw. Ver. Bremen 10: 342, pl. 4, figs. 3-3b.
(homonym of Unio macrorhynchus Locard, 1882; renamed Unio borcherdingi Locard, 1889)

Unio tumidus tumidus — Haas (1969)

Unio tumidulus Locard, 1889
Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): pl. 14, fig. 203 [as ‘Unio tumidus’].
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): pl. 40, fig. 542 [as ‘Unio tumidus’].
Locard, 1889. Contr. Faune Malacol. Franc. 13: 176 [70], 261 [155].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 213.
(homonym of Unio tumidulus Lea, 1856)
Type(s): LECTOTYPE MNHN_22586 (by Graf, 2011: 510), La Seine à Rouen (Seine-Inférieure).

Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio catinulus Locard, 1893
Locard, 1893. Bull. Soc. Sci. Nat. Elbeuf 12: 10.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 217.
Type(s): SYNTYPE MNHN_22172, La Seine à Elbeuf (Seine-Inférieure).

Unio tumidus — Germain (1908), Germain (1931)
— Haas (1969)

Unio elboviensis Locard, 1893
Locard, 1893. Bull. Soc. Sci. Nat. Elbeuf 12: 4.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 215.

Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio lacrymiformis Locard, 1893
Locard, 1893. Bull. Soc. Sci. Nat. Elbeuf 12: 12.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 216, fig. 228.
Type(s): LECTOTYPE MNHN_22300 (by Graf, 2011: 483), La Seine au nord de Rouen.

Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio levoiturieri Locard, 1893
Locard, 1893. Bull. Soc. Sci. Nat. Elbeuf 12: 7.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 216.

Unio tumidus — Germain (1908)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio rothomagensis Locard, 1893
Locard, 1893. Coqu. Eau Douce Saumâtre France: 213.
Type(s): LECTOTYPE MNHN_22503 (by Graf, 2011: 501), la Seine près Rouen.

Unio tumidus — Germain (1908), Germain (1931)
Unio tumidus tumidus — Haas (1940), Haas (1969)

Unio vinceloti Germain, 1904
‘de Joannis’ Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 276 [38].
(new name for Unio pictorum var. vinceleus de Joannis, 1859)

Unio (Vincelotiana) vinceloti — Germain (1904)

Unio vinceloti var. cuneiformis Germain, 1904
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 276 [38], pl. 2, fig. 37.
(intro'd as intra-sp. of Unio vinceloti Germain, 1904)

Unio (Vincelotiana) vinceloti cuneiformis — Germain (1904)

Unio lauterborni Haas, 1909
Haas, 1909. Beitr. Kenntn. Mittleleurop. Najadeen, Beilage zu... 41: 46.

Unio tumidus lauterborni — Kobelt & Haas (1910)
Unio tumidus tumidus — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. okae Kobelt & Haas, 1910
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 58, index, pl. 480, figs. 2565-2566.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788; homonym of Unio crassus var. okae Kobelt & Haas, 1910; renamed Unio tumidus var. kobeltianus Zhadin, 1938)

Unio (s.s.) tumidus var. kobeltianus — Zhadin (1938)
Unio tumidus borysthenensis — Haas (1969)

Unio tumidus ilekensis Kobelt, 1912
Kobelt, 1912. Icon. Land- und Süssw.-Moll. 18: 28, pl. 492, fig. 2629.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio (s.s.) tumidus var. ilikensis [sic] — Zhadin (1938)
Unio tumidus borysthenensis — Haas (1940), Haas (1969)
Tumidiana tumida tumida — Kantor & Sysoev (2005)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. succinctus Hilbert, 1912
Hilbert, 1912. Schr. Königsberg. Phys. Ges. 52: 271.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio tumidus tumidus — Haas (1969)

Unio tumidus var. natermanni Honigmann, 1914
Honigmann, 1914. Abh. Ber. Mus. Magdeburg 2: 7.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio tumidus borysthenensis — Haas (1940), Haas (1969)

Unio tumidus var. bashkiricus Zhadin, 1938
Zhadin, 1938. Faune USSR Mollusques 4(1): 81, text fig. 19.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio (s.s.) tumidus var. bashkiricus — Zhadin (1938)
Unio tumidus borysthenensis — Haas (1940), Haas (1969)
Unio tumidus var. bashkiricus — Zhadin (1965)
Tumidiana tumida tumida — Kantor & Sysoev (2005)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. fridmani Zhadin, 1938
Zhadin, 1938. Faune USSR Mollusques 4(1): 86, text fig. 21.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio (s.s.) tumidus var. fridmani — Zhadin (1938)
Unio tumidus borysthenensis — Haas (1940), Haas (1969)
Unio tumidus var. fridmani — Zhadin (1965)
Tumidiana tumida tumida — Kantor & Sysoev (2005)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. ilikensis Zhadin, 1938
‘Kobelt’ of Authors.
Zhadin, 1938. Faune USSR Mollusques 4(1): 83.
Kantor & Sysoev, 2005. Cat. Moll. Russia: 327.
(error for Unio tumidus ilekensis Kobelt, 1912)

Unio tumidus var. kobeltianus Zhadin, 1938
Zhadin, 1938. Faune USSR Mollusques 4(1): 82.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788; new name for Unio tumidus var. okae Kobelt & Haas, 1910; homonym of Unio batavus kobeltianus Haas, 1913)

Unio (s.s.) tumidus var. kobeltianus — Zhadin (1938)
Unio tumidus borysthenensis — Haas (1940), Haas (1969)
Tumidiana tumida tumida — Kantor & Sysoev (2005)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio tumidus var. moltshanovi Zhadin, 1938
Zhadin, 1938. Faune USSR Mollusques 4(1): 85, text fig. 20.
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio (s.s.) tumidus var. moltshanovi — Zhadin (1938)
Unio tumidus borysthenensis — Haas (1940), Haas (1969)
Unio (s.s.) tumidus — Vinarski & Kantor (2016)

Unio limagnae Jay, 1835
‘Bouillet’ of Authors.
Jay, 1835. Cat. Rec. Shells: 16 [as ‘limagnæ’].
Lea, 1836. Synopsis Fam. Naiades: 36 [as ‘limagnæ’].
Lea, 1838. Synopsis Fam. Naiades: 24 [as ‘limagnæ’].
(error for Unio limaniae Dupuy, 1852)

Unio concavus of Authors, unknown year
‘Zeleb.’ of Authors.

Unio elongatus of Authors, unknown year
‘Rm.’ of Authors.

Unio muelleri var. compressus of Authors, unknown year
Westerl. Faun. Moll. Suec. of Authors.

Mytilus angustior Lister, 1685
Lister, 1685. Conch.: ??. [pre-linnaean]

Unio rostrata Waardenburg, 1827
Waardenburg, 1827. Moll. Belgico: 36.
(misidentified reference to Unio rostrata Lamarck, 1819)

Unio tumidus — Germain (1908), Germain (1931)

Unio batavus Rossmässler, 1836
Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): pl. 15, fig. 214.
(misidentified reference to Mya batava Maton & Rackett, 1807)

Unio tumidus Rossmässler, 1836
Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): pl. 14, fig. 203.
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 41, pl. 40, fig. 542.
Rossmässler, 1844. Icon. Land- und Süssw.-Moll. 2 (6): pl. 60, fig. 773.
Dupuy, 1852. Hist. Natur. Moll. France (6): pl. 28, fig. 20.
Turton, 1857. Man. Land Fresh-Water Shells Brit. Is.: pl. 2, fig. 13.
Forbes & Hanley, 1859. Brit. Moll.: pl. 40, fig. 1.
(reference to Unio tumidus Retzius, 1788)

Unio tumidus — Germain (1908), Germain (1931)

Unio tumidus var. radiolata Krynicki, 1837
Krynicki, 1837. Bull. Soc. imp. Nat. Moscou 10(2): 59. [nomen nudum]
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio tumidus Mousson, 1849
Mousson, 1849. Land-Süßw.-Moll. Java: 95, pl. 17 [16], fig. 1.
(reference to Unio tumidus Retzius, 1788)

Rectidens sumatrensis — Haas (1914)
Unio tumidus — van Benthem Jutting (1953)
Rectidens sumatrensis sumatrensis — Haas (1969)

Unio zelebori Zelebor, 1851
‘Parreyss’ Zelebor, 1851. Ber. Mit. Freunde Naturw. Wien 7: 231, sp. 8. [nomen nudum]

Unio (s.s.) tumidus zelebori — Falkner et al. (2001)
Unio tumidus zelebori — Lopes-Lima et al. (2017)

Unio pictorum var. vinceleus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: pl. 12, fig. 5. [in part]
(reference to Unio pictorum var. vinceleus de Joannis, 1859)

Unio (Batavusiana) potamius — Germain (1904)
Unio batavus — Germain (1931)

Unio vincelleus Locard, 1882
‘de Joannis’ Locard, 1882. Prodr. Malac. Franç. 1: 298.
(error for Unio pictorum var. vinceleus de Joannis, 1859)

Unio alpacamus Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 178 [72].
(error for Unio alpecanus Locard, 1882)

Unio pictorum var. vincelus Locard, 1889
‘de Joannis’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 140 [34].
(error for Unio pictorum var. vinceleus de Joannis, 1859)

Unio vincelens Caziot, 1907
‘Bourg.’ Caziot, 1907. Bull. Soc. Sci. Hist. Nat. Yonne 60: 276.
(error for Unio pictorum var. vinceleus de Joannis, 1859)

Unio elbovensis Germain, 1931
‘Locard’ Germain, 1931. Faune de France 22: 741.
(error for Unio elboviensis Locard, 1893)

Unio albovicensis Haas, 1940
‘Locard’ Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 129.
(error for Unio elboviensis Locard, 1893)

Unio subtumidus van Benthem Jutting, 1953
‘Mousson, in litt.’ van Benthem Jutting, 1953. Treubia 22(1): 45.
(intro'd as syn of Unio tumidus Retzius, 1788)

Unio tumidus — van Benthem Jutting (1953)

Unio elbovicensis Haas, 1969
‘Locard’ Haas, 1969. Das Tierreich 88: 21.
(error for Unio elboviensis Locard, 1893)

Unio pictorum var. vincelius Haas, 1969
‘Joannis’ Haas, 1969. Das Tierreich 88: 26.
(error for Unio pictorum var. vinceleus de Joannis, 1859)

Unio (Unio) tumidus ssp. [Bassin de la Saône] Falkner et al., 2002
Falkner et al., 2002. Patrim. Natur. 52: 55. [nomen nudum]
(intro'd as intra-sp. of Unio tumidus Retzius, 1788)

Unio (s.s.) tumidus ssp. [Bassin de la Saône] — Falkner et al. (2002)

Unio tumidu Li et al., 2010
Li et al., 2010. Hereditas 32(4): 363.
(error for Unio tumidus Retzius, 1788)

Unio lateborni Vinarski & Kantor, 2016
‘Haas’ Vinarski & Kantor, 2016. Analyt. Cat. Fr. Brack. Moll. Russia: 23.
(error for Unio lauterborni Haas, 1909)

Unio tumidus borysthensis Lopes-Lima et al., 2017
‘Kobelt’ Lopes-Lima et al., 2017. Biol. Rev. 92(1): ??.
(error for Unio tumidus var. borysthenensis Kobelt, 1879)