Mya ovalis Lightfoot, 1786
Lister, 1685. Conch.: pl. 146, fig. 1. [pre-linnaean]
‘S.’ Lightfoot, 1786. Catalogue of the Portland Museum: 134, no. 2983.

Unio crassus Retzius, 1788
Schröter, 1779. Gesch. Flußconch.: 182, pl. 2, fig. 2 [Mya testa crassa]. [non-binomial]
Philipsson in Retzius, 1788. Diss. Nat.-Hist. Test. Gen.: 17.

Margaritana crassa — Simpson (1900), Simpson (1914)
Unio crassus — Kobelt & Haas (1910), Ortmann (1912), Ortmann (1914), Germain (1931), Zhadin (1965), ... Chen et al. (2025), Hou et al. (2025), Wang et al. (2025), Chen et al. (2025), Campbell & Lydeard (2026)
Unio (s.s.) crassus — Zhadin (1938)
Unio crassus crassus — Haas (1940), Haas (1969), Fauna Europaea (2012), Prié & Puillandre (2014), Lopes-Lima et al. (2017), Klishko et al. (2017), Bogatov (2022)
Crassiana crassa crassa — Akromovski (1976), Kantor & Sysoev (2005), Kantor et al. (2010)
Batavusiana (Crassunio) crassa — Zatravkin (1983), Stadnichenko (1984), Zatravkin (1987)
Unio (Crassunio) crassus — Falkner (1994)
Batavusiana (Crassiana) crassus — Korniushin (1998)
Unio (Crassiana) crassus crassus — Falkner et al. (2001), Falkner et al. (2002)
Crassiana (s.s.) crassa — Starobogatov et al. (2004)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio c. crassus — Príe et al. (2021)

Mya pictorum Gmelin, 1791
Lister, 1678. Hist. Anim. Anglic.: pl. 2, fig. 30; [app.] pl. 1, fig. 4. [pre-linnaean]
Lister, 1685. Conch.: pl. 146, fig. 1; pl. 147, figs. 2-3. [pre-linnaean]
Schröter, 1779. Gesch. Flußconch.: pl. 2, fig. 2; pl. 3, figs. 2-5; pl. 4, fig. 6.
Martini & Chemnitz, 1782. Conchyl. Cab. 6: 19, pl. 1, fig. 6.
Gmelin, 1791. Syst. Nat. 1(6): 3218, sp. 3.
(misidentified reference to Mya pictorum Linnaeus, 1758)

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

Unio musivus Spengler, 1793
Spengler, 1793. Skr. Naturhist. Selsk. 3: 67, no. 32.

Unio musivus — Simpson (1900)
Unio crassus musivus — Ortmann (1912), Bogatov (2022)
Unio (sec. Lymnium) batavus — Simpson (1914)
Unio crassus crassus — Haas (1940), Haas (1969), Fauna Europaea (2012), Klishko et al. (2017)
Batavusiana (s.s.) musiva — Zatravkin (1983), Zatravkin (1987)
Batavusiana (s.s.) musivus [??] — Korniushin (1998)
Crassiana (Bataviana) musiva — Starobogatov et al. (2004)
Crassiana musiva musiva — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio crassus — Graf (2007), Bogatov et al. (2018), Anisimova et al. (2018), Lopes-Lima et al. (2024)
Unio (Crassiana) musivus — Vinarski & Kantor (2016)
Unio crassus cf. courtillieri — Klishko et al. (2017)

Mya batava Maton & Rackett, 1807
Schröter, 1779. Gesch. Flußconch.: pl. 3, figs. 2, 4-5.
Martini & Chemnitz, 1782. Conchyl. Cab. 6: 19, pl. 1, fig. 6.
Bruguière, 1797. Encycl. Méth. 2: pl. 248, fig. 3.
Maton & Rackett, 1807. Trans. Linn. Soc. London 8: 37.

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio (Batavusiana) batavus — Germain (1904)
Unio (Groupe des Batavusiana) batavus — Caziot (1907)
Unio batavus — Kobelt & Haas (1910), Haas (1924), Germain (1931)
Unio crassus musivus — Ortmann (1912)
Unio crassus batavus — Haas (1940), Haas (1969), Fauna Europaea (2012), Lopes-Lima et al. (2017)
Batavusiana (s.s.) musiva — Zatravkin (1983), Zatravkin (1987)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Araujo et al. (2018)

Unio lemovicincae Férussac, 1807
‘Linn.’ Draparnaud, 1806. Hist. Moll. France: pl. 11, fig. 5.
Férussac, 1807. Ess. méth.: 114 [as ‘lemovicincæ’].

Unio litoralis Pfeiffer, 1821
Pfeiffer, 1821. Natur. Deutsch. Land Sussw. Moll. 1: 117, pl. 5, fig. 12.
Rossmässler, 1853. Zeitschr. f. Malakozool. 10: 92.
Mørch, 1863. Vidensk. Medd. Naturhist. Foren. Kjöben. (17-22): ??.
(misidentified reference to Unio littoralis Cuvier, 1798; error for Unio littoralis Cuvier, 1798)

Margaritana crassa — Simpson (1900), Simpson (1914)
Batavusiana (Crassunio) crassa — Stadnichenko (1984)
Crassiana crassa crassa — Kantor & Sysoev (2005), Kantor et al. (2010)

Unio ater Nilsson, 1822
‘Linn.’ Draparnaud, 1806. Hist. Moll. France: pl. 11, fig. 5 [as ‘Unio margaritifera’].
Nilsson, 1822. Hist. Moll. Svec.: 107.

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio (s.s.) ater — Zhadin (1938)
Unio crassus crassus — Haas (1940), Haas (1969)
Batavusiana (s.s.) musiva — Zatravkin (1987)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio rubens Menke, 1828
Menke, 1828. Syn. Method. Moll.: 64, 90.
Menke, 1830. Syn. Method. Moll.: 107, 149.

Quadrula (sec. Fusconaia) coccinea — Simpson (1900), Simpson (1914)
Quadrula (Obliquata) coccinea — Frierson (1927)
Unio crassus crassus — Haas (1940), Haas (1969)
Pleurobema sintoxia — Parmalee & Bogan (1998), Williams et al. (2008)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio rugatus Menke, 1828
Menke, 1828. Syn. Method. Moll.: 64, 90.
Menke, 1830. Syn. Method. Moll.: 107, 149.

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio consentaneus var. — Kobelt & Haas (1910)
Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio badius Kokeil, 1831
Kokeil, 1831. Mich. Comp.: pl. 16, fig. 36.

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

Unio arcuata Bouchard-Chantereaux, 1838
Bouchard-Chantereaux, 1838. Cat. Moll. Terr. Fluv. Départ. Pas-de-Calais: 91, pl. 1, fig. 1-2.
(renamed Unio bouchardi Locard, 1889)

Margaritana auricularia — Germain (1931)
Unio consentaneus var. moquini — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus moquinianus — Prie (2012)

Unio corrugata Mauduyt, 1839
Mauduyt, 1839. Tableau Indic. Moll. Vienne: 8, pl. 1, fig. 1.

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

Unio gangrenosus J.F. Schmidt, 1840
‘Ziegler’ J.F. Schmidt, 1840. Bull. Soc. imp. Nat. Moscou 13: 436.
J.F. Schmidt, 1847. Conch. Krain: 26.

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio crassus cytherea — Haas (1940), Haas (1969)

Unio littoralis var. minor Rossmässler, 1842
Rossmässler, 1842. Icon. Land- und Süssw.-Moll. 2 (5): 14, pl. 55, figs. 744. [in part]
(misidentified reference to Unio littoralis var. minor Rossmässler, 1842)

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio (Tumidusiana) tumidus var. minor — Stadnichenko (1984)

Unio crassissimus Hanley, 1843
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 33 [as ‘Mysca tumida var. crassissima’]. [nomen nudum]
‘Fer.’ Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 209.

Margaritana crassa — Simpson (1900), Simpson (1914)

Unio manca Millet, 1843
‘Lamarck’ of Authors.
Millet, 1843. Mag. Zool.: 4, pl. 64, fig. 2.
(misidentified reference to Unio manca Lamarck, 1819)

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio (Mancusiana) mancus — Germain (1904)
Unio mancus — Germain (1931)

Unio batavus var. pusillus Rossmässler, 1844
Rossmässler, 1844. Icon. Land- und Süssw.-Moll. 2 (6): ??.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio pusillus Lea, 1840)

Unio drouetii Dupuy, 1849
Dupuy, 1849. Cat. Extramar. Galliae Test.: no. 326.
Dupuy, 1852. Hist. Natur. Moll. France (6): 639, pl. 24, fig. 12.

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969), Fauna Europaea (2012)
Unio crassus — Lopes-Lima et al. (2024)

Unio ventricosus Scholtz, 1853
Scholtz, 1853. unknown publication: ??.
(homonym of Unio ventricosus Barnes, 1823)

Unio capigliolo Küster, 1855
‘Payraudeau’ of Authors.
Küster, 1855. Conchyl. Cab. 9(2): 125, pl. 34, figs. 5-6. [in part]
Sowerby, 1868. Conch. Icon. 16: pl. 75, sp. 392.
(misidentified reference to Unio capigliolo Payraudeau, 1826)

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

Unio gangraenosus Küster, 1855
‘Ziegler’ of Authors.
Küster, 1855. Conchyl. Cab. 9(2): 124.
Westerlund, 1890. Fauna Paläarct. Binnenconch. 2(7): 81.
Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 130.
Haas, 1969. Das Tierreich 88: 46.
(error for Unio gangrenosus J.F. Schmidt, 1840)

Unio (Crassiana) crassus — Vinarski & Kantor (2016)

Unio rivularis Moquin-Tandon, 1855
Rossmässler, 1844. Icon. Land- und Süssw.-Moll. 2 (6): fig. 414.
Moquin-Tandon, 1855. Hist. Natur. Moll. France 2: 571.
(homonym of Unio rivularis Conrad, 1853)

Unio (Crassiana) crassus — Vinarski & Kantor (2016)

Unio batavus var. sarratinus Moquin-Tandon, 1855
‘St. Germain, in litt.’ Moquin-Tandon, 1855. Hist. Natur. Moll. France 2: 571.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)

Unio courtillieri Hattemann, 1859
Hattemann, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 232.

Unio (Fusculusiana) fusculus — Germain (1904)
Unio crassus var. piscinalis — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969), Lopes-Lima et al. (2017)
Unio (Crassiana) crassus courtillieri — Falkner et al. (2001), Falkner et al. (2002)
Unio crassus courtillieri — Prié & Puillandre (2014), Lopes-Lima et al. (2017)
Unio crassus cf. courtillieri — Klishko et al. (2017)
Unio crassus courtillierii [sic] — Araujo et al. (2018)
Unio crassus — Anisimova et al. (2018), Bogatov et al. (2018), Lopes-Lima et al. (2024)
Unio c. courtillieri — Príe et al. (2021)
Unio cf. courtillieri — Lopes-Lima et al. (2021)

Unio batavus var. acutus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 287, pl. 10, fig. 1.
(homonym of Unio acutus Rossmässler, 1837)

Unio batavus var. baraceus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 285, pl. 9, fig. 7.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)

Unio batavus var. baraceus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio batavus var. longus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 288, pl. 10, fig. 3.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio longus Philippi, 1869)

Unio batavus — Germain (1931)

Unio batavus var. minimus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 289, pl. 9, fig. 6.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio requienii var. minima Drouët, 1857)

Unio mancus var. amnicus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio batavus var. senotius de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: 288, pl. 10, fig. 4.

Unio sanderi Bourguignat, 1862
Bourguignat, 1862. Malacol. Lac Quatre-Cantons: 55.
Bourguignat, 1864. Malac. Aix-les-Baines: 76.

Unio mancus var. macrorhynchus — Germain (1931)

Unio merdiger Reeve, 1865
Jay, 1839. Cat. Rec. Shells: 25, sp. 1065.
‘Walsh.’ Lea, 1852. Synopsis Fam. Naiades: ??. [nomen nudum]
‘Watts’ Reeve, 1865. Conch. Icon. 16: pl. 28, sp. 145.

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

Unio lambottei Malzine, 1867
Malzine, 1867. Essai faun. malac. Belg.: 32, pl. 2, figs, 3-4.

Unio (Ateriana) lambottei — Germain (1904)
Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio ryckholtii Malzine, 1867
Malzine, 1867. Essai faun. malac. Belg.: 32, pl. 2, figs. 1-2.

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

Unio batavus var. squamosus Brot, 1867
Brot, 1867. Assoc. Zool. Léman Ann. (1866): pl. 9, fig. 1.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; misidentified reference to Unio batavus var. squamosus Charpentier, 1837)

Unio consentaneus — Germain (1931)

Unio ryckholti var. cuneata Malzine, 1867
Malzine, 1867. Essai faun. malac. Belg.: 32.
(intro'd as intra-sp. of Unio ryckholtii Malzine, 1867; homonym of Unio cuneatus Jacquemin, 1835)

Unio batavus — Germain (1931)

Unio (tumidus) elegans Westerlund, 1867
Westerlund, 1867. Malak. Blatt. 14: 202, 206.
(homonym of Unio elegans Lea, 1831)

Unio (Crassiana) crassus — Vinarski & Kantor (2016)

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

Unio crassus var. maximus Kobelt, 1872
Kobelt, 1872. Malak. Blatt. 19: 142, pl. 5.
Kobelt, 1884. Icon. Land- und Süssw.-Moll. 1: 67, pl. 29, figs. 218-219.
(intro'd as intra-sp. of Unio crassus Retzius, 1788; homonym of Unio pictorum maxima Mørch, 1863)

Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio pseudolitoralis Clessin, 1877
Clessin, 1875. Verh. Ver. Naturgesch. Hamburg 2: 258 [as ‘pseudo-litoralis’]. [nomen nudum]
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 469, text fig. 305 [as ‘pseudo-litoralis’].

Unio (s.s.) crassus var. pseudolitoralis — Zhadin (1938)
Unio crassus crassus — Haas (1940), Haas (1969)
Unio crassus var. pseudolitoralis — Zhadin (1965)
Batavusiana (Crassunio) crassa — Stadnichenko (1984), Zatravkin (1987)
Crassiana crassa crassa — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio subtilis Drouët, 1879
Drouët, 1879. J. de Conch. 27: 142.

Unio (Groupe des Mancusiana) subtilis — Caziot (1907)
Unio mancus var. amnicus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio vescoi var. conemenosi Westerlund & Blanc, 1879
Blanc in Westerlund & Blanc, 1879. Aperçu Faune Malac. Grèce: 145.
(intro'd as intra-sp. of Unio vescoi Bourguignat, 1856)

— Bank (2006)

Unio moquinianus Brevière, 1880
Brevière, 1880. Cat. moll. Nièvre: 26.
(misidentified reference to Unio moquinianus Dupuy, 1843)

Unio consentaneus — Germain (1931)

Unio requieni Brevière, 1880
‘Mich.’ Brevière, 1880. Cat. moll. Nièvre: 26.
(misidentified reference to Unio requienii Michaud, 1831)

Unio consentaneus — Germain (1931)

Unio andegavensis Locard, 1882
‘Servain’ Locard, 1882. Prodr. Malac. Franç. 1: 289, 359.
‘Servain’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 142 [36].
‘Servain’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 167.
Type(s): POSSIBLE SYNTYPE MNHN_22100, La Maine à Angers.

Unio (Batavusiana) andegavensis — Germain (1904)
— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio arenarum Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 289, 358.
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 144 [38].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 171.
Type(s): IDIOTYPE MNHN_22110, Basse Indre (Loire-Inf.).

Unio (Batavusiana) arenarum — Germain (1904)
Unio batavus var. baraceus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio berthelini Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 290, 359.
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 137 [31].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 163.
Type(s): IDIOTYPE MNHN_22132, La Marne, à Charenton (Seine).

Unio mancus var. amnicus form riparius — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio brevierei Locard, 1882
‘Bourguignat’ Locard, 1882. Prodr. Malac. Franç. 1: 286 [as ‘brevieri’], 356.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 148 [42].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 178.
(correct name for Unio brevieri Locard, 1882)
Type(s): LECTOTYPE MNHN_22145 (by Graf, 2011: 465), La Canne, à Goulnot.

Unio (Ateriana) brevieri [sic] — Germain (1904)
Unio (Groupe des Ateriana) brevierei — Caziot (1907)
— Simpson (1914)
Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio brevieri Locard, 1882
‘Bourguignat in Locard’ of Authors.
Locard, 1882. Prodr. Malac. Franç. 1: 286.
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 265.
Germain, 1931. Faune de France 22: 732.
Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 130.
Haas, 1969. Das Tierreich 88: 49.
(incorrect original spelling of Unio brevierei Locard, 1882)

Unio crassus — Lopes-Lima et al. (2024)

Unio carantoni Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 295, 364.
‘Coutagne’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 129 [23].
‘Coutagne’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 157.
Type(s): IDIOTYPE MNHN_22162, [illegible] (Charente).

Unio carantoni — Rochebrune (1903)
Unio mancus var. amnicus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio crassatellus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 286, 356.
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 136 [30].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 162.
Type(s): LECTOTYPE MNHN_22182 (by Graf, 2011: 469), La Canne, à Jailly (Nièvre).

Unio crassatellus — Rochebrune (1903)
— Simpson (1914)
Unio crassus — Germain (1931), Lopes-Lima et al. (2024)
Unio crassus batavus — Haas (1940), Haas (1969)

Unio cyprinorum Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 289, 358.
‘Berthier’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 142 [36].
‘Berthier’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 168.
Type(s): IDIOTYPE MNHN_22185, l’Ornain (Meuse).

Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Crassiana (Bataviana) cyprinorum — Starobogatov et al. (2004)
Crassiana cyprinorum — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio crassus — Graf (2007), Lopes-Lima et al. (2024)
Unio (Crassiana) cyprinorum — Vinarski & Kantor (2016)
Unio crassus musivus — Bogatov (2022)

Unio feliciani Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 285, 355.
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 134 [28].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 161, fig. 175.
Bourguignat in Locard, 1899. Conchyliol. Portug.: 217.
Type(s): POSSIBLE SYNTYPE MNHN_22215, La Moselle.

Unio (Socardiana) feliciani — Germain (1904)
— Simpson (1914)
Unio batavus var. baraceus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio lagnisicus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 291, 359.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 127 [21] [as ‘lagnysicus’].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 154 [as ‘lagnysicus’].
Type(s): SYNTYPE MNHN_22303, Condal (Saône-et-Loire).

Unio lagnysicus [sic] — Rochebrune (1903), Kobelt & Haas (1910)
Unio mancus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus mancus — Prie (2012)
Unio crassus — Lopes-Lima et al. (2024)

Unio ligericus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 289, 358.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 142 [36].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 169.
Type(s): IDIOTYPE MNHN_22310, La Loire à Ingrandes.

Unio (Batavusiana) ligericus — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio locardianus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 287, 356.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 138 [32].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 164, fig. 178.
Type(s): IDIOTYPE MNHN_22316, l’Albane (Côte-d’Or).

Unio crassus — Germain (1931), Lopes-Lima et al. (2024)
Unio crassus batavus — Haas (1940), Haas (1969)

Unio marcellinus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 285, 355.
‘Berthier’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 149 [43].
‘Berthier’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 180.

Unio (Ateriana) marcellinus — Germain (1904)
— Simpson (1914)
Unio consentaneus var. moquini — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus moquinianus — Prie (2012)
Unio crassus — Lopes-Lima et al. (2024)

Unio matronicus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 289, 358.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 143 [37].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 170.
Type(s): LECTOTYPE MNHN_22355 (by Graf, 2011: 489), La Marne à Lagny (Seine-et-Marne).

Unio (Batavusiana) matronicus — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio oxyrhynchus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 285, 355.
‘Brevière’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 149 [43].
‘Brevière’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 180.
(homonym of Unio oxyrhynchus Martens, 1861)
Type(s): LECTOTYPE MNHN_22438 (by Graf, 2011: 495), La Canne, dans la Nièvre.

Unio consentaneus var. oxyrhynchus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio pilloti Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 291, 360.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 128 [22].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 157.
Type(s): IDIOTYPE MNHN_22460, Passavant (Haute-Saône).

Unio pilloti — Kobelt & Haas (1910)
Unio mancus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus mancus — Prie (2012)
Unio crassus — Lopes-Lima et al. (2024)

Unio rayi Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 291, 360.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 127 [21].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 155.
Type(s): LECTOTYPE MNHN_22483 (by Graf, 2011: 500), Gigny (Jura).

Unio (Groupe des Ninusiana) [sic] rayi — Caziot (1907)
Unio rayi — Kobelt & Haas (1910)
Unio mancus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus mancus — Prie (2012)
Unio crassus — Lopes-Lima et al. (2024)

Unio septentrionalis Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 284, 354.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 149 [43].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 181, fig. 194.
Type(s): IDIOTYPE MNHN_22528, le Mandrezey, à Saulcy-sur-Meurthe (Vosges).

Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)

Unio sequanicus Locard, 1882
Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 289, 358.
‘Coutagne’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 142 [36].
‘Coutagne’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 169, fig. 183.
Type(s): LECTOTYPE MNHN_22529 (by Graf, 2011: 504), La Marne à Lagny (Seine-et-Marne).

— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio batavellus Locard, 1885
‘Letourneux’ Locard, 1885. Bull. Soc. Sci. Nat. Rouen 21: 11.
‘Letourneux’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 144 [38].
‘Letourneux’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 170, fig. 184.
Type(s): LECTOTYPE MNHN_22127 (by Graf, 2011: 462), La Bouille, près de Rouen (Seine-Inf.).

Unio batavellus — Rochebrune (1903), Kobelt & Haas (1910)
Unio (Batavusiana) batavellus — Germain (1904)
— Simpson (1914)
Unio batavus var. baraceus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio baroni Servain, 1887
Servain, 1887. Bull. Soc. Malac. France 4: 254.

— Simpson (1914)

Unio carcasinus Sourbieu, 1887
Sourbieu, 1887. Bull. Soc. Malac. France 4: 235.

Unio crassus var. piscinalis — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)

Unio baudoni Folin, 1888
Folin, 1888. Le Naturaliste 10: 273, 4 text figs.
(homonym of Unio baudoni Folin & Bérillon, 1874)

Unio baudoni — Kobelt (1902)
Unio crassus batavus — Haas (1940), Haas (1969)

Unio crassulus Drouët, 1888
Drouët, 1888. J. de Conch. 36: 106.
Drouët, 1889. Mém. Acad. Sci. Dijon 1: 66, pl. 2, fig. 5.
(homonym of Unio requienii crassulus Drouët, 1867)
Type(s): SYNTYPE MNHN_MP_0027, Saone.

— Simpson (1914)
Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio hamburgiensis Servain, 1888
Servain, 1888. Bull. Soc. Malac. France 5: 315.

— Simpson (1914)
Unio crassus — Germain (1931), Lopes-Lima et al. (2024)
Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)

Unio minutulus Servain, 1888
‘Ray’ Locard, 1882. Prodr. Malac. Franç. 1: 290 [as ‘Unio minutus’]. [nomen nudum]
‘Ray’ Servain, 1888. Bull. Soc. Malac. France 5: 316.

Unio mancus var. amnicus — Germain (1931)
Unio crassus batavus — Haas (1940)

Unio vegesackensis Servain, 1888
Bourguignat in Servain, 1888. Bull. Soc. Malac. France 5: 317.

— Simpson (1914)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio visurgisinus Servain, 1888
Servain, 1888. Bull. Soc. Malac. France 5: 316.

Unio (Batavusiana) visurgicus [sic] — Germain (1904)
— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio adonus Locard, 1889
‘Servain’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 146 [40], 211 [105].
‘Servain’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 175, fig. 188.
Type(s): LECTOTYPE MNHN_22085 (by Graf, 2011: 456), La Loire a Basse Indre (Loire-Inf.).

Unio (Lemotheuxiana) adonus — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio andeliacus Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 138 [32], 196 [90].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 165.
Type(s): LECTOTYPE MNHN_22101 (by Graf, 2011: 458), le Gouet, à Saint-Brieue (Côtes-du-Nord).

Unio mancus var. elongatulus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio aturicus Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 129 [23], 188 [82].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 157.
Type(s): HOLOTYPE (MONOTYPY) MNHN_22118, Bahus (Landes).

Unio mancus var. amnicus form riparius — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)

Unio balbignyanus Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 147 [41], 217 [111].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 178.
Type(s): LECTOTYPE MNHN_22122 (by Graf, 2011: 462), La Loire, à Balbigny (Loire).

— Simpson (1914)
Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio besnardianus Locard, 1889
Servain, 1888. Bull. Soc. Malac. France 5: 317. [nomen nudum]
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 141 [35], 206 [100].
‘Servain’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 172, fig. 186 [as ‘besnardinus’].
(renamed Unio besnardi Germain, 1904)
Type(s): LECTOTYPE MNHN_22133 (by Graf, 2011: 463), La Loire, à Saint-Gemmes (Maine-et-Loire).

Unio (Batavusiana) besnardi — Germain (1904)
— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio bouchardi Locard, 1889
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 149 [43].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 180.
(new name for Unio arcuata Bouchard-Chantereaux, 1838)
Type(s): LECTOTYPE FIGURED SPECIMEN (by Graf, 2011: 464), ditches of Saint-Omer, fed by the Aa.

Unio consentaneus var. moquini — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus moquinianus — Prie (2012)
Unio crassus — Lopes-Lima et al. (2024)

Unio caroliensis Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 159 [53], 237 [131].
‘F. Pacome’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 172.
Type(s): LECTOTYPE MNHN_22167 (by Graf, 2011: 467), Charolles (Saône-et-Loire).

Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio catalaunicus Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 133 [27], 192 [86].
‘Coutagne’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 160.
Type(s): LECTOTYPE MNHN_22171 (by Graf, 2011: 467), La Marne, à Charenton (Seine).

Unio crassus var. piscinalis — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio caumonti Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 145 [39], 207 [101].
Bourguignat in Locard, 1893. Coqu. Eau Douce Saumâtre France: 171.

— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio diptychus Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 143 [37], 201 [95].
‘Surault’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 169.
Type(s): POSSIBLE SYNTYPE MNHN_22192, La Loire à Ingrandes.

Unio (Batavusiana) diptychus — Germain (1904)
— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio financei Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 143 [37], 205 [99].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 171.
Type(s): IDIOTYPE MNHN_22217, La Marne à Châlons (Marne).

Unio batavus — Germain (1931)
— Haas (1969)

Unio hattemani Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 146 [40], 212 [106].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 176.
Type(s): SYNTYPE MNHN_22254, La Loire, à Basse-Indre.

Unio (Lemotheuxiana) hattemanni [sic] — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio ignariformis Locard, 1889
‘Dup.’ Drouët, 1857. Étud. Naïades. France, Unio: 100, pl. 9, fig. 1 [as ‘U. platyrhynchoideus’].
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 147 [41], 214 [108].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 177.

— Simpson (1914)
Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)

Unio ingrandiensis Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 143 [37], 202 [96].
‘Sarault’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 173.
Type(s): POSSIBLE SYNTYPE MNHN_22282, Ingrandes (Maine-et-Loire).

Unio (Batavusiana) ingrandiensis — Germain (1904)
— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio lagnysicus Locard, 1889
‘Bourguignat’ of Authors.
Locard, 1889. Contr. Faune Malacol. Franc. 13: 127 [21].
Westerlund, 1890. Fauna Paläarct. Binnenconch. 2(7): 84.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 154.
Dumas, 1895. Rev. Sci. Bourbonnais, Suppl.: 47.
Rochebrune, 1903. Bull. Mus. Nation. Hist. Natur. 9: 389.
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 37.
(error for Unio lagnisicus Locard, 1882)

Unio lemotheuxi Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 145 [39], 208 [102].
‘Servain’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 175, fig. 189.
Type(s): LECTOTYPE MNHN_22306 (by Graf, 2011: 484), le Reyran (Var).

Unio (Lemotheuxiana) lemotheuxi — Germain (1904), Caziot (1910)
Unio mancus var. elongatulus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio mariae Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 159 [53], 236 [130] [as ‘mariæ’].
‘F. Pacome’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 172 [as ‘mariæ’].
Type(s): IDIOTYPE MNHN_22342, La Loire à Nantes (Loire-Infereur).

Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio materniacus Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 143 [37], 203 [97].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 168, fig. 182.
Type(s): LECTOTYPE MNHN_22347 (by Graf, 2011: 488), la Somme à Abbeville.

Unio materniacus — Rochebrune (1903)
— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio melantatus Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 147 [41], 216 [110].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 177.
Type(s): LECTOTYPE MNHN_22360 (by Graf, 2011: 489), La Loire à Balbigny (Loire).

— Simpson (1914)
Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio nicolloni Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 141 [35], 200 [94].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 173.
Type(s): HOLOTYPE (MONOTYPY) MNHN_22404, Nantes.

Unio (Batavusiana) nicolloni — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio occidentalis Locard, 1889
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 149 [43], 220 [114].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 180.
‘Bourguignat’ Locard, 1899. Conchyliol. Portug.: 220.
(homonym of Unio occidentalis Conrad, 1836)
Type(s): LECTOTYPE MNHN_22424 (by Graf, 2011: 494), Balbigny (Loire).

— Simpson (1914)
Unio consentaneus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio seneauxi Locard, 1889
‘Linn.’ Draparnaud, 1806. Hist. Moll. France: 131, pl. 11, figs. 3 [as ‘Unio pictorum var. B’].
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 145 [39], 208 [102].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 174, fig. 187 [as ‘senauxi’].
Type(s): LECTOTYPE MNHN_22523 (by Graf, 2011: 503), La Loire à Orléans.

Unio (Batavusiana) seneauxi — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio subamnicus Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 137 [31], 194 [88].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 163.
Type(s): SYNTYPE MNHN_22559, La Saône, à Auxonne (Côte-d’Or).

Unio subamnicus — Kobelt & Haas (1910)
Unio mancus var. amnicus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio surraulti Locard, 1889
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 144 [38], 204 [98].
‘Servain’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 174 [as ‘suraulti’].
Type(s): SYNTYPE MNHN_22569, La Loire à Ingrandes.

Unio (Batavusiana) surraulti — Germain (1904)
— Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio visurgicus Locard, 1889
‘Servain’ of Authors.
Locard, 1889. Contr. Faune Malacol. Franc. 13: 141 [35].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 173.
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 262.
(error for Unio visurgisinus Servain, 1888)

Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio subrobustus var. curta Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 135 [29].
(homonym of Unio curtus Lea, 1859; intro'd as intra-sp. of Unio subrobustus Servain, 1885)

Unio sieversi var. kobelti Westerlund, 1890
Kobelt, 1886. Icon. Land- und Süssw.-Moll. 2: pl. 53, fig. 286 [as ‘U. sieversi’].
Westerlund, 1890. Fauna Paläarct. Binnenconch. 2(7): 151.
(homonym of Unio kobelti Neumayr, 1899; intro'd as intra-sp. of Unio sieversi Drouët, 1881)

Unio ampullaceus Locard, 1893
Locard, 1893. Coqu. Eau Douce Saumâtre France: 174.
(homonym of Unio ampullaceus Lea, 1866)
Type(s): LECTOTYPE MNHN_22098 (by Graf, 2011: 458), Le Mans (Sarthe).

Unio (Batavusiana) ampullaceus — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio chardoni Locard, 1893
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 173.

Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio gliscerus Locard, 1893
Locard, 1893. Coqu. Eau Douce Saumâtre France: 168.
Type(s): LECTOTYPE MNHN_22241 (by Graf, 2011: 477), La Loire à Nantes (Loire-Infereur).

Unio (Batavusiana) gliscerus — Germain (1904)
Unio batavus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio lamboltei Locard, 1893
‘Malzine’ of Authors.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 177.
Germain, 1931. Faune de France 22: 732.
Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 130.
(error for Unio lambottei Malzine, 1867)

Unio lancelevei Locard, 1893
Locard, 1893. Bull. Soc. Sci. Nat. Elbeuf 12: 1.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 170.
Type(s): SYNTYPE MNHN_22305, le Seine au nord d. Rouen.

Unio batavus var. baraceus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio lepidulus Drouët, 1898
Drouët, 1898. Mém. Acad. Sci. Dijon ??: 60, pl. 1, fig. 7.

Unio mancus var. elongatulus — Germain (1931)

Unio batavus var. major Drouët, 1898
Drouët, 1898. Mém. Acad. Sci. Dijon ??: 61.
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio (Anodontes) sirionos var. major d’Orbigny, 1835)

Unio batavus var. baraceus — Germain (1931)

Unio ellipsopsis Locard, 1899
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 140 [34]. [nomen nudum]
Bourguignat in Locard, 1899. Conchyliol. Portug.: 218.

Unio besnardi Germain, 1904
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 261 [23].
(new name for Unio besnardianus Locard, 1889)

Unio (Batavusiana) besnardi — Germain (1904)

Unio ater var. irgizlaicus Lindholm, 1904
Lindholm, 1904. Ann. Mus. St. Pétersbourg 8(3-4): 343.
(intro'd as intra-sp. of Unio ater Nilsson, 1822)

Unio crassus crassus — Haas (1969), Klishko et al. (2017)
Batavusiana (s.s.) irgislaica [sic] — Zatravkin (1987)
Crassiana (Bataviana) irgizlaica — Starobogatov et al. (2004)
Crassiana irgizlaica — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio crassus — Graf (2007), Lopes-Lima et al. (2024)
Unio (Crassiana) irgizlaicus — Vinarski & Kantor (2016)
Unio crassus musivus — Bogatov (2022)

Unio batavellus var. perconvexus Germain, 1904
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 260 [22].
(intro'd as intra-sp. of Unio batavellus Locard, 1885)

Unio (Batavusiana) batavellus perconvexus — Germain (1904)

Unio batavus var. radiata Germain, 1904
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 257 [19].
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio (Elliptio) viridis var. radiata Rafinesque, 1820)

Unio (Batavusiana) batavus radiata — Germain (1904)

Unio ligericus var. subsinuatus Germain, 1904
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 259 [21].
(intro'd as intra-sp. of Unio ligericus Locard, 1882)

Unio (Batavusiana) ligericus subsinuatus — Germain (1904)

Unio pseudolittoralis [sic] var. curonicus Riemenschneider, 1907
Riemenschneider, 1907. Nachr. Bl. Dtsch. Malak. Ges. 39: 150.
(intro'd as intra-sp. of Unio pseudolitoralis Clessin, 1877)

Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio crassus var. okae Kobelt & Haas, 1910
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 58, index, pl. 480, fig. 2567.
(intro'd as intra-sp. of Unio crassus Retzius, 1788)

Unio (s.s.) crassus var. okae — Zhadin (1938)
Unio crassus gontieri — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio crassus heimburgi Haas, 1911
Haas, 1911. Verh. Naturhist. Ver. Preuß. Rheinl. 68: 527, pl. 6, fig. 20.
(intro'd as intra-sp. of Unio crassus Retzius, 1788)

Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio kungurensis Kobelt, 1912
Kobelt, 1912. Icon. Land- und Süssw.-Moll. 18: 24, pl. 490, figs. 2622-2623.

Unio (s.s.) crassus kungurensis — Zhadin (1938)
Unio crassus gontieri — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio roseni Kobelt, 1912
Kobelt, 1912. Icon. Land- und Süssw.-Moll. 18: 27, pl. 492, fig. 2627.

Unio (s.s.) crassus var. roseni — Zhadin (1938)
Unio crassus gontieri — Haas (1940), Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio kungurensis chlebnikowi Kobelt, 1912
Kobelt, 1912. Icon. Land- und Süssw.-Moll. 18: 26, pl. 491, fig. 2624.
(intro'd as intra-sp. of Unio kungurensis Kobelt, 1912; renamed Unio crassus var. chlebnikovi Zhadin, 1938)

Unio (s.s.) crassus var. chlebnikovi [sic] — Zhadin (1938)
Unio crassus gontieri — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio kungurensis irenjensis Kobelt, 1912
Kobelt, 1912. Icon. Land- und Süssw.-Moll. 18: 26, pl. 491, fig. 2626.
(intro'd as intra-sp. of Unio kungurensis Kobelt, 1912)

Unio (s.s.) crassus var. chlebnikovi [sic] — Zhadin (1938)
Unio crassus gontieri — Haas (1940), Haas (1969), Graf (2007)
Batavusiana (s.s.) irenjensis — Zatravkin (1983), Stadnichenko (1984), Zatravkin (1987)
Crassiana irenjensis — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio (Crassiana) irenjensis — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio kungurensis sylwensis Kobelt, 1912
Kobelt, 1912. Icon. Land- und Süssw.-Moll. 18: 26, pl. 491, fig. 2625.
(intro'd as intra-sp. of Unio kungurensis Kobelt, 1912)

Unio (s.s.) crassus var. chlebnikovi [sic] — Zhadin (1938)
Unio crassus gontieri — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio crassus thuringiacus Israel, 1913
Israel, 1913. [in] Thüring. Lehrerverein Naturk.: 28, pl. 6, figs. 4-6.
(intro'd as intra-sp. of Unio crassus Retzius, 1788)

Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio crassus ornatus Polinksi, 1917
Polinksi, 1917. C. R. Soc. Sci. Varsovie 10: 904, pl. ??, fig. 2.
(homonym of Unio ovatus var. ornatus Conrad, 1835; intro'd as intra-sp. of Unio crassus Retzius, 1788)

Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio crassus polonicus Polinksi, 1917
Polinksi, 1917. C. R. Soc. Sci. Varsovie 10: 902, pl. ??, figs. 1, 3.
(intro'd as intra-sp. of Unio crassus Retzius, 1788)

Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio cantianus Kennard & Woodward, 1924
Kennard & Woodward, 1924. Proc. Malac. Soc. London 16: 136, text figs. 8-9.

Unio crassus batavus — Haas (1940), Haas (1969)

Unio lagnysiacus Germain, 1931
‘Bourguignat in Locard’ of Authors.
Germain, 1931. Faune de France 22: 724.
Prie, 2012. MalaCo 8: 430.
(error for Unio lagnisicus Locard, 1882)

Unio crassus var. chlebnikovi Zhadin, 1938
‘Kobelt’ Zhadin, 1938. Faune USSR Mollusques 4(1): 89.
(new name for Unio kungurensis chlebnikowi Kobelt, 1912)

Unio crassus var. ishmensis Zhadin, 1938
Zhadin, 1938. Faune USSR Mollusques 4(1): 160.
(intro'd as intra-sp. of Unio crassus Retzius, 1788)

Unio (s.s.) crassus var. ishmensis — Zhadin (1938)
Unio crassus crassus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Lopes-Lima et al. (2024)

Unio pseudolittoralis Riemenschneider, 1907
‘Clessin’ of Authors.
Riemenschneider, 1907. Nachr. Bl. Dtsch. Malak. Ges. 39: 150.
Vinarski & Kantor, 2016. Analyt. Cat. Fr. Brack. Moll. Russia: 25.
(error for Unio pseudolitoralis Clessin, 1877)

Unio courtilieri Locard, 1889
‘Hattemann’ of Authors.
Locard, 1889. Contr. Faune Malacol. Franc. 13: 132 [26].
‘Hattemann’ Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 256 [18].
‘Hattmann’ Germain, 1931. Faune de France 22: 724, 727.
Lopes-Lima et al., 2024. MPE 195: suppl. append. 2, p. 3.
(error for Unio courtillieri Hattemann, 1859)

Unio coactatus of Authors, unknown year
Ziégl. in sched. of Authors.

Unio inflatus of Authors, unknown year
Locard 1881 of Authors.

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

Unio platyrhynchoideus of Authors, unknown year
de Cessac of Authors.

Unio margaritifera Draparnaud, 1806
‘Linn.’ Draparnaud, 1806. Hist. Moll. France: pl. 11, fig. 5.
(misidentified reference to Mya margaritifera Linnaeus, 1758)

Unio consentaneus — Germain (1931)

Unio pictorum Draparnaud, 1806
‘Linn.’ Draparnaud, 1806. Hist. Moll. France: 131, pl. 11, figs. 3 [var. B]. [in part]
(misidentified reference to Mya pictorum Linnaeus, 1758)

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio (Batavusiana) seneauxi — Germain (1904)
Unio batavus — Germain (1931)

Unio batavus Nilsson, 1822
‘Lamarck’ Nilsson, 1822. Hist. Moll. Svec.: 112.
(reference to Mya batava Maton & Rackett, 1807)

Unio crassus Nilsson, 1822
‘Retzius’ Nilsson, 1822. Hist. Moll. Svec.: 108.
(reference to Unio crassus Retzius, 1788)

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

Unio lemovicensis Kickx, 1830
‘Daud.’ Kickx, 1830. Synopsin Molluscorum Brabantiae: 82.
(error for Unio lemovicincae Férussac, 1807)

Unio rubens Menke, 1830
Menke, 1830. Syn. Method. Moll.: 149.
(reference to Unio rubens Menke, 1828)

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

Unio fuscus Lea, 1836
‘Zieg.’ Lea, 1836. Synopsis Fam. Naiades: 27.
(intro'd as syn of Mya batava Maton & Rackett, 1807)

Unio gibba Lea, 1836
‘Mühl. Pfeif.’ Lea, 1836. Synopsis Fam. Naiades: 27.
(intro'd as syn of Mya batava Maton & Rackett, 1807)

Unio acutus Rossmässler, 1837
Rossmässler, 1837. Icon. Land- und Süssw.-Moll. 1 (5-6): 56, pl 29, fig. 413 [as ‘Unio an n. sp.?’]. [nomen nudum]

Mysca batava var. fuscula subvar. pallipes Schlüter, 1838
‘Ziegl.’ Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 33. [infra-subsp.]
(intro'd as intra-sp. of Unio fusculus Rossmässler, 1836)

Mysca reniformis subvar. kokeilli Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 32. [infra-subsp.]
(intro'd as intra-sp. of Unio reniformis Rossmässler, 1836)

Unio gargottae Rossmässler, 1838
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 26, pl. 35, fig. 493.
(misidentified reference to Unio gargottae Philippi, 1836)

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

Unio requieni Rossmässler, 1844
‘Mich.’ Rossmässler, 1844. Icon. Land- und Süssw.-Moll. 2 (6): 29, pl. 57, fig. 757-761.
(misidentified reference to Unio requienii Michaud, 1831)

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) batavus var. requieni — Simpson (1914)

Unio glaucinus Stabile, 1845
Stabile, 1845. Faun. Lug.: f. 75.
(misidentified reference to Unio glaucinus Porro, 1838)

Unio (sec. Lymnium) batavus — Simpson (1900)

Unio piscinalis J.F. Schmidt, 1847
J.F. Schmidt, 1847. Conch. Krain: 27.
(misidentified reference to Unio piscinalis Rossmässler, 1836)

Unio retzii C.B. Adams, 1847
‘Küst.’ C.B. Adams, 1847. Cat. Gen. Sp. Adams: 14. [nomen nudum]

Unio moquinianus Sandberger & Koch, 1851
Sandberger & Koch, 1851. Jb. Nassau. Ver. Naturk. 7: 245.
(misidentified reference to Unio moquinianus Dupuy, 1843)

Unio argens Lea, 1852
‘Küst.’ Lea, 1852. Synopsis Fam. Naiades: 30.
(intro'd as syn of Mya batava Maton & Rackett, 1807)

Unio drouatii Lea, 1852
‘Dup.’ Lea, 1852. Synopsis Fam. Naiades: 39.
(error for Unio drouetii Dupuy, 1849)

Unio kurrii Lea, 1852
‘Küst.’ Lea, 1852. Synopsis Fam. Naiades: 30.
(intro'd as syn of Mya batava Maton & Rackett, 1807)

Unio moquinianus Drouët, 1852
Drouët, 1852. Etudes Nayades de la France: pl. 6, fig. 3.
(misidentified reference to Unio moquinianus Dupuy, 1843)

Unio consentaneus — Germain (1931)

Unio nanus Dupuy, 1852
‘Lamarck’ Dupuy, 1852. Hist. Natur. Moll. France (6): pl. 25, fig. 16.
(misidentified reference to Unio nana Lamarck, 1819)

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (Rhomboïdiana) nana — Germain (1904)
Unio nana — Kobelt & Haas (1910)
Unio (sec. Lymnium) batavus var. requieni — Simpson (1914)
Unio mancus var. nanus — Germain (1931)

Unio ovalis Dupuy, 1852
Dupuy, 1852. Hist. Natur. Moll. France (6): pl. 25, fig. 13.
(misidentified reference to Mya ovalis Montagu, 1803)

Unio (sec. Lymnium) batavus — Simpson (1900), Simpson (1914)
Unio (Batavusiana) besnardi — Germain (1904)
Unio batavus — Germain (1931)

Unio crassus Küster, 1854
‘Retz.’ Küster, 1854. Conchyl. Cab. 9(2): 113, pl. 31, fig. 5. [in part]
(reference to Unio crassus Retzius, 1788)

Lampsilis (sec. Eurynia) radiatus — Simpson (1900)
Lampsilis (Eurynia) radiata — Simpson (1914)

Unio ater Moquin-Tandon, 1855
‘Nilss.’ Moquin-Tandon, 1855. Hist. Natur. Moll. France 2: 570.
(reference to Unio ater Nilsson, 1822)

Unio ater Drouët, 1857
‘Nilss.’ Drouët, 1857. Étud. Naïades. France, Unio: 72, pl. 4, fig. 1.
(reference to Unio ater Nilsson, 1822)

Unio consentaneus — Germain (1931)

Unio nanus Drouët, 1857
‘Lam.’ Drouët, 1857. Étud. Naïades. France, Unio: pl. 5, fig. 2.
(misidentified reference to Unio nana Lamarck, 1819)

Unio (Rhomboïdiana) nana — Germain (1904)
Unio nana — Kobelt & Haas (1910)
Unio mancus var. nanus — Germain (1931)

Unio platyrhynchoideus Drouët, 1857
‘Dup.’ Drouët, 1857. Étud. Naïades. France, Unio: 100, pl. 9, fig. 1.
(misidentified reference to Unio platyrinchoideus Dupuy, 1849)

Unio batavus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: pl. 9, fig. 2. [in part]
(reference to Mya batava Maton & Rackett, 1807)

Unio (Batavusiana) batavus radiata — Germain (1904)

Unio batavus var. courtilieri de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: pl. 9, fig. 3.
(reference to Unio courtillieri Hattemann, 1859; error for Unio courtillieri Hattemann, 1859)

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

Unio batavus var. nanus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: pl. 9, fig. 8. [in part]
(misidentified reference to Unio nana Lamarck, 1819)

Unio (Melasiana) melas — Germain (1904)
Unio mancus var. amnicus — Germain (1931)

Unio batavus var. nanus de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: pl. 9, fig. 10. [in part]
(misidentified reference to Unio nana Lamarck, 1819)

Unio (Rhomboïdiana) nana — Germain (1904)

Unio batavus var. ovalis de Joannis, 1859
de Joannis, 1859. Ann. Soc. Linn. Maine-et-Loire 3: pl. 10, fig. 2.
(misidentified reference to Mya ovalis Montagu, 1803)

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

Unio orientalis Küster, 1862
‘Parreis in sched.’ Küster, 1862. Conchyl. Cab. 9(2): 267.
(intro'd as syn of Unio kotschyi Küster, 1862)

Unio ater Bourguignat, 1864
Bourguignat, 1864. Malac. Aix-les-Baines: 73.
(reference to Unio ater Nilsson, 1822)

Unio mancus var. macrorhynchus — Germain (1931)

Unio batavus var. fontainei Colbeau, 1868
‘Lecomte’ Colbeau, 1868. Ann. Soc. Malac. Belgique 3: 106. [nomen nudum]
(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)

Unio maceerthyanus Lea, 1870
‘Bourg.’ Lea, 1870. Synopsis Fam. Naiades: 48.
(error for Unio maccarthyanus Bourguignat, 1866; misidentified reference to Unio maccarthyanus Bourguignat, 1866)

Unio batavus Miller, 1873
Miller, 1873. Schalth. Bodensees: pl. 2, fig. 8.
(reference to Mya batava Maton & Rackett, 1807)

Unio crassus — Germain (1931)

Unio diagonalis Drouët, 1881
‘Held’ Drouët, 1881. J. de Conch. 29: 27.
(intro'd as syn of Unio batavus var. squamosus Charpentier, 1837)

Unio minutus Locard, 1882
‘Ray’ Locard, 1882. Prodr. Malac. Franç. 1: 290. [nomen nudum]

Unio mancus var. amnicus — Germain (1931)
Unio crassus batavus — Haas (1969)
Unio crassus — Lopes-Lima et al. (2024)

Unio sandrii Locard, 1882
Locard, 1882. Prodr. Malac. Franç. 1: 292.
(misidentified reference to Unio sandrii Rossmässler, 1844)

Unio hueti Kobelt, 1886
‘Bourg.’ Kobelt, 1886. Icon. Land- und Süssw.-Moll. 2: 22, pl. 41, fig. 255.
(misidentified reference to Unio hueti Bourguignat, 1855)

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

Unio sieversi Kobelt, 1886
Kobelt, 1886. Icon. Land- und Süssw.-Moll. 2: pl. 53, fig. 286.
(misidentified reference to Unio sieversi Drouët, 1881)

Unio dilophius Servain, 1888
‘Bourguignat’ Servain, 1888. Bull. Soc. Malac. France 5: 316, footnote. [nomen nudum]
Locard, 1889. Contr. Faune Malacol. Franc. 13: 136 [30], footnote. [nomen nudum]

Unio sperchinus Locard, 1889
‘Thièse’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 141 [35], footnote. [nomen nudum]

Unio pilloti var. minor Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 129 [23]. [nomen nudum]
(intro'd as intra-sp. of Unio pilloti Locard, 1882)

Unio suborbicularis var. minor Locard, 1889
Locard, 1889. Contr. Faune Malacol. Franc. 13: 127 [21]. [nomen nudum]
Westerlund, 1890. Fauna Paläarct. Binnenconch. 2(7): 84. [nomen nudum]
(intro'd as intra-sp. of Unio suborbicularis Drouët, 1888)

Unio besnardinus Locard, 1893
‘Servain’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 172.
(error for Unio besnardianus Locard, 1889)

Unio (Batavusiana) besnardi — Germain (1904)

Unio senauxi Locard, 1893
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 174.
(error for Unio seneauxi Locard, 1889)

Unio suraulti Locard, 1893
‘Servain in Locard’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 174.
(error for Unio surraulti Locard, 1889)

Unio musicus Simpson, 1900
‘Spengler’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 744.
(error for Unio musivus Spengler, 1793)

Unio (sec. Lymnium) batavus — Simpson (1914)

Unio hattemanni Germain, 1904
‘Bourguignat’ Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 265 [27].
(error for Unio hattemani Locard, 1889)

Unio carioliensis Germain, 1931
‘Pacôme’ Germain, 1931. Faune de France 22: 728.
(error for Unio caroliensis Locard, 1889)

Unio visursisinus Germain, 1931
‘Servain’ Germain, 1931. Faune de France 22: 728.
(error for Unio visurgisinus Servain, 1888)

Unio hattmanni Haas, 1940
‘Bourguignat’ Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 131.
(error for Unio hattemani Locard, 1889)

Unio kungurensis sylvensis Haas, 1940
‘Kobelt’ Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 132.
‘Kobelt’ Haas, 1969. Das Tierreich 88: 53.
Vinarski & Kantor, 2016. Analyt. Cat. Fr. Brack. Moll. Russia: 25.
(error for Unio kungurensis sylwensis Kobelt, 1912)

Unio lancelevi Haas, 1969
‘Locard’ Haas, 1969. Das Tierreich 88: 51.
(error for Unio lancelevei Locard, 1893)

Unio crassus var. irgislaicus Zatravkin, 1987
‘Lindholm’ Zatravkin, 1987. Byull. Mosk. Obshch.. Ispyt. Prir. 92(4): 57.
(error for Unio ater var. irgizlaicus Lindholm, 1904)