species Unio nanus Lamarck, 1819: synonymy

Unio nana Lamarck, 1819

Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 76, sp. 27.

Unio (sec. Lymnium) littoralis — Simpson (1900)
Unio (Rhomboïdiana) nana — Germain (1904)
Unio (Groupe des Ninusiana) [sic] nanus — Caziot (1907)
Unio nana — Kobelt & Haas (1910)
Unio (sec. Lymnium) (Group U. littoralis) littoralis — Simpson (1914)
Unio mancus var. nanus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Batavusiana (s.s.) nana — Zatravkin (1983), Zatravkin (1987)
Unio (Crassiana) crassus nanus — Falkner et al. (2001), Falkner et al. (2002)
Crassiana (Bataviana) nana — Starobogatov et al. (2004)
Crassiana nana nana — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio crassus — Graf (2007), Bogatov et al. (2018), Anisimova et al. (2018)
Unio crassus nanus — Prié & Puillandre (2014)
Unio (Crassiana) nana — Vinarski & Kantor (2016)
Unio crassus crassus — Klishko et al. (2017)
Unio crassus nana — Bogatov (2022)
Unio nanus — Lopes-Lima et al. (2024), Hou et al. (2024), Nagel (2025), Campbell & Lydeard (2026), Prie et al. (2026)

Unio dilatatus Studer, 1820

(homonym of Unio (Eurynia) dilatata Rafinesque, 1820)
Bruguière, 1797. Encycl. Méth. 2: pl. 249, fig. 4a-b [as Unio sp.].
Studer, 1820. System. Verzeich. bekannt geword. Schweizer-Conchylien: 30.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio inflatus Studer, 1820

(misidentified reference to Unio pictorum Draparnaud, 1806)
Draparnaud, 1806. Hist. Moll. France: pl. 11, figs. 2. [in part]
Studer, 1820. System. Verzeich. bekannt geword. Schweizer-Conchylien: 30.

Unio pictorum — He & Zhuang (2013)
Unio (s.s.) pictorum — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024)

Unio ovatus Studer, 1820

(homonym of Unio ovatus Say, 1817)
Schröter, 1779. Gesch. Flußconch.: pl. 3, figs. 2.
Studer, 1820. System. Verzeich. bekannt geword. Schweizer-Conchylien: 30.

Unio consentaneus ovatus — Kobelt & Haas (1910)
Unio crassus var. piscinalis — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio planus Studer, 1820

Studer, 1820. System. Verzeich. bekannt geword. Schweizer-Conchylien: 30.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio rostratus Studer, 1820

(homonym of Unio rostrata Lamarck, 1819)
Studer, 1820. System. Verzeich. bekannt geword. Schweizer-Conchylien: 30.

Unio nanus — Lopes-Lima et al. (2024)

Unio sinuatus Studer, 1820

(homonym of Unio sinuata Lamarck, 1819)
Schröter, 1779. Gesch. Flußconch.: 182, pl. 2, fig. 2 [Mya testa crassa]. [non-binomial]
Studer, 1820. System. Verzeich. bekannt geword. Schweizer-Conchylien: 30.

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

Unio riparia Pfeiffer, 1821

Bruguière, 1797. Encycl. Méth. 2: pl. 249, fig. 4a-b [as Unio sp.].
Pfeiffer, 1821. Natur. Deutsch. Land Sussw. Moll. 1: 118, pl. 5, fig. 13.
Scholtz, 1843. Land- und Wassermoll. Schlesiens: 129. [nomen nudum]

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (Socardiana) riparius — Germain (1904)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio mancus var. amnicus form riparius — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio (Crassiana) crassus riparius — Falkner et al. (2001), Falkner et al. (2002)
Unio crassus crassus — Lopes-Lima et al. (2017)
Unio nanus — Lopes-Lima et al. (2024)

Unio castaneus Fitzinger, 1833

(homonym of Unio castaneus Lea, 1831)
Fitzinger, 1833. Syst, Verz. Österr. Weichth.: 119.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio cytherea Küster, 1833

Küster, 1833. Icones Moll. Test. Abthl. 2: pl. 5, fig. 3.

Unio cytherea cytherea — Haas (1913)
Unio crassus cytherea — Haas (1940), Haas (1969), Fauna Europaea (2012), Prié & Puillandre (2014), Lopes-Lima et al. (2017)
Unio (Crassiana) crassus cytherea — Falkner et al. (2001), Falkner et al. (2002)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio crassus — Araujo et al. (2018)
Unio nanus — Lopes-Lima et al. (2024)

Unio sinuolata Küster, 1833

Küster, 1833. Icones Moll. Test. Abthl. 2: pl. 5, fig. 5.

Unio cytherea cytherea — Haas (1913)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024)

Unio decurvatus Rossmässler, 1835

Rossmässler, 1835. Icon. Land- und Süssw.-Moll. 1 (2): 22, pl. 9, fig. 131.
Rossmässler, 1837. Icon. Land- und Süssw.-Moll. 1 (5-6): 21, pl. 24, fig. 339.
LECTOTYPE SMF 16490 (by Zilch, 1967: 63), Lake Worth, north shore,Austria.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus cytherea — Haas (1940), Haas (1969), Fauna Europaea (2012), Lopes-Lima et al. (2017)
Unio (Crassiana) crassus decurvatus — Falkner et al. (2001)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio labacensis Rossmässler, 1835

(intro'd as syn of Mya batava Maton & Rackett, 1807)
‘Ziegler’ Rossmässler, 1835. Icon. Land- und Süssw.-Moll. 1 (2): 21.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio amnicus Rossmässler, 1836

Rossmässler, 1835. Icon. Land- und Süssw.-Moll. 1 (2): 20.
‘Ziegl.’ Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): 31, pl. 15, fig. 212.
LECTOTYPE SMF 10842 (by Zilch, 1967: 60), from streams near Rožnik, today a district of Ljubljana, Slovenia.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (Groupe des Amnicusiana) amnicus — Caziot (1907)
Unio consentaneus minor — Kobelt & Haas (1910)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio mancus var. amnicus — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio atrovirens Rossmässler, 1836

‘Schmidt’ Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): 28, pl. 15, figs. 206-207.
LECTOTYPE SMF 10835 (by Zilch, 1967: 61), outlet of Lake Worth, Austria.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio carinthiacus Rossmässler, 1836

‘Z.’ Rossmässler, 1835. Icon. Land- und Süssw.-Moll. 1 (2): 21.
‘Ziegl.’ Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): 30, pl. 15, fig. 209.
SYNTYPE SMF 10836, canal connected to Lake Worth, Austria.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (Batavusiana) carynthiacus [sic] — Germain (1904)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio batavus — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio carynthiacus ‘Zeigler’ of Authors

(error for Unio carinthiacus Rossmässler, 1836)
‘Zeigler’ of Authors.
Lea, 1836. Synopsis Fam. Naiades: 27.
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 33.
Lea, 1838. Synopsis Fam. Naiades: 20.
J.F. Schmidt, 1840. Bull. Soc. imp. Nat. Moscou 13: 435.
C.B. Adams, 1847. Cat. Gen. Sp. Adams: 14.
Lea, 1852. Synopsis Fam. Naiades: 30.
Lea, 1870. Synopsis Fam. Naiades: 47.
Schröder, 1885. Bull. Soc. Malac. France 2: 229.
Servain, 1888. Bull. Soc. Malac. France 5: 317.
Locard, 1889. Contr. Faune Malacol. Franc. 13: 141 [35].
Germain, 1904. Bull. Soc. Sci. Nat. Ouest France 4: 264.
Germain, 1931. Faune de France 22: 728.

Unio consentaneus Rossmässler, 1836

‘Ziegl.’ Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): 29, pl. 15, fig. 208.
‘Ziegl.’ Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 42, pl. 40, fig. 544.
Rossmässler, 1842. Icon. Land- und Süssw.-Moll. 2 (5): 14, pl. 55, fig. 742.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio consentaneus — Kobelt (1910), Germain (1931)
Unio consentaneus var. — Kobelt & Haas (1910)
Unio crassus consentaneus — Ortmann (1912)
Unio cytherea cytherea — Haas (1913)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio (s.s.) crassus consentancus [sic] — Zhadin (1938)
Unio crassus cytherea — Haas (1940), Haas (1969)
Batavusiana (s.s.) nana — Zatravkin (1987)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024)

Unio fusculus Rossmässler, 1836

‘Z.’ Rossmässler, 1835. Icon. Land- und Süssw.-Moll. 1 (2): 21.
‘Ziegler’ Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): 30, pl. 15, fig. 211.
LECTOTYPE SMF 10839 (by Zilch, 1967: 63), Kaltengange in Oesterreich, Austria.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (Fusculusiana) fusculus — Germain (1904)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus var. piscinalis — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Batavusiana (s.s.) fuscula — Zatravkin (1983), Zatravkin (1987)
Batavusiana (s.s.) fuscula fuscula — Stadnichenko (1984)
Crassiana (Bataviana) fuscula — Starobogatov et al. (2004)
Crassiana fuscula — Kantor & Sysoev (2005), Kantor et al. (2010)
Unio crassus — Graf (2007)
Unio (Crassiana) fusculus — Vinarski & Kantor (2016)
Unio crassus crassus — Klishko et al. (2017)
Unio crassus musivus — Bogatov (2022)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio piscinalis Rossmässler, 1836

‘Z.’ Rossmässler, 1835. Icon. Land- und Süssw.-Moll. 1 (2): 21.
‘Ziegl.’ Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): 30, pl. 15, fig. 210.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus var. piscinalis — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio reniformis Rossmässler, 1836

‘Schmidt’ Rossmässler, 1836. Icon. Land- und Süssw.-Moll. 1 (3): 31, pl. 15, fig. 213.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus var. piscinalis — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio retusa Held, 1836

(homonym of Unio retusa Lamarck, 1819)
Held, 1836. Isis (Oken) 1836: 281.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio batavus var. elongatus Held, 1837

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio elongata Lamarck, 1819)
Held, 1837. Isis (Oken) 1837 (4): 306.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio batavus var. gibbosus Held, 1837

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio gibbosus Barnes, 1823)
Held, 1837. Isis (Oken) 1837 (4): 306.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio batavus var. squamosus Charpentier, 1837

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Charpentier, 1837. Cat. Moll. Suisse: 25, pl. 2, fig. 22.

Unio consentaneus squamosus — Kobelt (1910), Kobelt & Haas (1910)
Unio consentaneus — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus legitimus Rossmässler, 1838

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 25, pl. 35, fig. 491a. [infra-subsp.]

Unio crassus cytherea — Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus minor Rossmässler, 1838

(homonym of Unio margaritifer var. minor Rossmässler, 1835; intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 25, pl. 35, fig. 491c. [infra-subsp.]

Unio consentaneus minor — Kobelt & Haas (1910)
Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus pulcher Rossmässler, 1838

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836; homonym of Unio pulcher Lea, 1838)
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 25, pl. 35, fig. 491b. [infra-subsp.]

Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus minor batavosimilis Rossmässler, 1838

(intro'd as intra-sp. of Unio consentaneus minor Rossmässler, 1838)
Rossmässler, 1838. Icon. Land- und Süssw.-Moll. 2 (1-2): 25. [infra-subsp.]
LECTOTYPE SMF 10851, Confluence of the Danube and Rákos, Hungary/Slovakia.

Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

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.
POSSIBLE SYNTYPE SMF 10785, Krka River, Slovenia.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Nagel (2025)

Unio pruinosus J.F. Schmidt, 1840

J.F. Schmidt, 1840. Bull. Soc. imp. Nat. Moscou 13: 445, pl. 9, fig. 3.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus var. piscinalis — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio heldii Küster, 1854

Küster, 1854. Conchyl. Cab. 9(2): 111, pl. 30, fig. 5-7.

Unio (sec. Lymnium) batavus — Simpson (1900)
Unio heldii — Kobelt & Haas (1910)
Unio (sec. Lymnium) (Group U. littoralis) batavus — Simpson (1914)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024)

Unio nessorhynchus Küster, 1854

Küster, 1854. Conchyl. Cab. 9(2): 116, pl. 31, fig. 6.

Unio cytherea nessorhynchus — Haas (1913)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024)

Unio bosnensis Möllendorff, 1874

(renamed Unio bosnicus Locard, 1889)
Möllendorff, 1874. Beitr. Fauna Bosniens: 62, text figs. 21-22.
LECTOTYPE SMF 10857 (by Zilch, 1967: 61), Bosna River, near Sarajevo, Bosnia and Herzegovina.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio phaseolus Kobelt, 1879

(homonym of Unio phaseolus Hildreth, 1828)
‘Held’ Kobelt, 1879. Icon. Land- und Süssw.-Moll. 6: 44, pl. 163, fig. 1649.

Unio heldii — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024)

Unio croaticus Drouët, 1881

Drouët, 1881. J. de Conch. 29: 245.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio crassus — Jihad (2023)
Unio nanus — Lopes-Lima et al. (2024)

Unio neocomensis Drouët, 1881

Drouët, 1881. J. de Conch. 29: 247.

Unio mancus var. macrorhynchus — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024)

Unio danemorae Bourguignat in Locard, 1882

Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 284, 354 [as ‘danemoræ’].
‘Mörch’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 147 [41] [as ‘danemoræ’].
‘Mörch’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 177 [as ‘danemoræ’].
IDIOTYPE MNHN_22186, lac d’Ondres (Basses-Pyrénées).

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

Unio dubisianus Locard, 1882

(correct name for Unio dubisanus Locard, 1882)
‘Coutagne’ Locard, 1882. Prodr. Malac. Franç. 1: 291 [as ‘dubisanus’], 360.
‘Coutagne’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 129 [23].
‘Coutagne’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 158.
SYNTYPE MNHN_22198, La Clange (Jura).

Unio (Groupe des Mancusiana) dubisianus — Caziot (1907)
Unio mancus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus mancus — Prie (2012)
Unio nanus — Lopes-Lima et al. (2024)

Unio dubisiopsis Locard, 1882

(correct name for Unio dubisianopsis Locard, 1889)
Locard, 1882. Prodr. Malac. Franç. 1: 291 [as ‘dubisopsis’], 360.
Locard, 1889. Contr. Faune Malacol. Franc. 13: 128 [22] [as ‘dubisianopsis’].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 155 [as ‘dubisianopsis’].

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

Unio macrorhynchus Bourguignat in Locard, 1882

Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 292, 361.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 132 [26].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 158, fig. 172.
LECTOTYPE MNHN_22326 (by Graf, 2011: 486), lac du Bourget.

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

Unio melas Coutagne in Locard, 1882

Coutagne in Locard, 1882. Prodr. Malac. Franç. 1: 285, 355.
‘Coutagne’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 128 [22].
‘Coutagne’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 155, fig. 169.
SYNTYPE MNHN_22363, Saulcy-sur-Meurthe (Vosges) [written on shell].

Unio (Melasiana) melas — Germain (1904)
Unio mancus var. amnicus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio potamius Bourguignat in Locard, 1882

Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 289, 359.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 140 [34].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 169.
IDIOTYPE MNHN_22470, La Brizotte (Côte-d’Or).

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

Unio savensis Drouët, 1882

Drouët, 1882. Unionidae de Serbie: 15.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio socardianus Bourguignat in Locard, 1882

Bourguignat in Locard, 1882. Prodr. Malac. Franç. 1: 286, 355.
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 134 [28].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 161.

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

Unio striatulus Drouët, 1882

(homonym of Unio striatulus Lea, 1857; renamed Unio striolatus Drouët, 1884)
Drouët, 1882. Unionidae de Serbie: 19.

Unio crassus cytherea — Haas (1940)
Unio nanus — Lopes-Lima et al. (2024)

Unio truncatulus Drouët, 1882

(homonym of Unio rhomboideus var. truncatulus de Joannis, 1859)
Drouët, 1882. Unionidae de Serbie: 12.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio dokici Drouët, 1884

Drouët, 1884. Suppl. Unionidae de Serbie: 5, pl. 1, fig. 1.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio rivalis Drouët, 1884

Drouët, 1884. Suppl. Unionidae de Serbie: 13.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio serbicus Drouët, 1884

Drouët, 1884. Suppl. Unionidae de Serbie: 9, pl. 1, fig. 1.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio striolatus Drouët, 1884

(new name for Unio striatulus Drouët, 1882)
Drouët, 1884. Suppl. Unionidae de Serbie: 9.

Unio crassus cytherea — Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio duregicus Servain, 1885

Servain, 1885. Bull. Soc. Malac. France 2: 331.

Unio consentaneus ostiorum — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio ostiorum Servain, 1885

‘Brot, mss.’ Servain, 1885. Bull. Soc. Malac. France 2: 327.

Unio consentaneus ostiorum — Kobelt & Haas (1910)
Unio mancus var. macrorhynchus — Germain (1931)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio sandriopsis Servain, 1885

‘Bourguignat, mss.’ Servain, 1885. Bull. Soc. Malac. France 2: 325.

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

Unio subrobustus Servain, 1885

‘Bourguignat, mss.’ Servain, 1885. Bull. Soc. Malac. France 2: 332.

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

Unio tiguricus Servain, 1885

Servain, 1885. Bull. Soc. Malac. France 2: 329.

Unio consentaneus ostiorum — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio crassus — Jihad (2023)
Unio nanus — Lopes-Lima et al. (2024)

Unio turicus Servain, 1885

Servain, 1885. Bull. Soc. Malac. France 2: 327.

Unio consentaneus ostiorum — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio batavus var. albensis Hazay, 1885

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Hazay, 1885. Jb. Dtsch. Malak. Ges. 12: 43.
SYNTYPE SMF 10877, from a millpond in Fejér County, Hungary.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus albensis — Falkner et al. (2001)
Unio crassus batavus — Lopes-Lima et al. (2017)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio batavus var. ondovensis Hazay, 1885

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Hazay, 1885. Jb. Dtsch. Malak. Ges. 12: 43.

Unio crassus cytherea — Haas (1940), Haas (1969), Lopes-Lima et al. (2017)
Unio (Crassiana) crassus ondovensis — Falkner et al. (2001)
Unio nanus — Lopes-Lima et al. (2024)

Unio kochii Kobelt, 1886

Sandberger & Koch, 1851. Jb. Nassau. Ver. Naturk. 7: 245 [as ‘U. moquinianus’].
Kobelt, 1886. Jb. Nassau. Ver. Naturk. 39: 97, pl. 6, fig. 1.
Kobelt, 1886. Icon. Land- und Süssw.-Moll. 2: 46, pl. 56, figs. 295-296.

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

Unio batavus var. taunica Kobelt, 1886

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Kobelt, 1886. Jb. Nassau. Ver. Naturk. 39: 96, pl. 7, fig. 5.

Unio batavus taunicus — Haas (1910)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio badiellus Drouët, 1888

Drouët, 1888. J. de Conch. 36: 107.
Drouët, 1889. Mém. Acad. Sci. Dijon 1: 76, pl. 1, fig. 4.

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

Unio bosnicus Locard, 1889

(new name for Unio bosnensis Möllendorff, 1874)
‘Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 132 [26].

Unio crassus cytherea — Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio euthymeanus Locard, 1889

Locard, 1889. Contr. Faune Malacol. Franc. 13: 166 [60], 245 [139].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 203.
LECTOTYPE MNHN_22202 (by Graf, 2011: 473), La Saône à Collonges (Rhône).

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

Unio ignari Bourguignat in Locard, 1889

‘Nilss.’ Drouët, 1857. Étud. Naïades. France, Unio: 72, pl. 4, fig. 1 [as ‘U. ater’].
Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 146 [40], 213 [107].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 176.
SYNTYPES MNHN_22270, Le Mandrezey, à Saulcy-sur-Meurthe (Vosges).

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

Unio jurianus Locard, 1889

Locard, 1889. Contr. Faune Malacol. Franc. 13: 129 [23], 187 [81].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 157, fig. 171 [as ‘juranus’].
LECTOTYPE MNHN_22292 (by Graf, 2011: 482), La Valouze (Jura).

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

Unio manculus Locard, 1889

Locard, 1889. Contr. Faune Malacol. Franc. 13: 130 [24], 190 [84].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 156.
LECTOTYPE MNHN_22329 (by Graf, 2011: 486), Gigny (Jura).

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

Unio necomensis ‘Drouët’ of Authors

(error for Unio neocomensis Drouët, 1881)
‘Drouët’ of Authors.
Locard, 1889. Contr. Faune Malacol. Franc. 13: 132 [26].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 159.
Germain, 1931. Faune de France 22: 725.

Unio mancus var. macrorhynchus — Germain (1931)

Unio nubilus Locard, 1889

(homonym of Unio nubilus Lea, 1868)
Locard, 1889. Contr. Faune Malacol. Franc. 13: 138 [32], 198 [92].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 165, fig. 179.
LECTOTYPE MNHN_22414 (by Graf, 2011: 493), Verpillière (Isère).

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

Unio orbus Locard, 1889

Locard, 1889. Contr. Faune Malacol. Franc. 13: 138 [32], 195 [89].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 165.
LECTOTYPE MNHN_22427 (by Graf, 2011: 494), Pentoise (Jura).

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

Unio passavanti Bourguignat in Locard, 1889

Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 159 [53], 238 [132].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 178.
POSSIBLE SYNTYPE MNHN_22442, Passavant (Haute-Seine).

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

Unio redactus Drouët, 1889

Drouët, 1889. Mém. Acad. Sci. Dijon 1: 79, pl. 1, fig. 2.

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

Unio scotinus Locard, 1889

Locard, 1889. Contr. Faune Malacol. Franc. 13: 148 [42], 218 [112].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 178, fig. 192.
LECTOTYPE MNHN_22518 (by Graf, 2011: 503), Selles (Haute-Saône).

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

Unio stygnus Locard, 1889

Locard, 1889. Contr. Faune Malacol. Franc. 13: 148 [42], 219 [113].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 179.
LECTOTYPE MNHN_22556 (by Graf, 2011: 507), Passavant (Haute-Saône).

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

Unio valliericus Bourguignat in Locard, 1889

Bourguignat in Locard, 1889. Contr. Faune Malacol. Franc. 13: 139 [33], 199 [93].
‘Bourguignat’ Locard, 1893. Coqu. Eau Douce Saumâtre France: 165.
SYNTYPE MNHN_22592, l’Albane (Côte-d’Or).

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

Unio zoasthenus Locard, 1889

Locard, 1889. Contr. Faune Malacol. Franc. 13: 128 [22], 186 [80].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 155.
LECTOTYPE MNHN_22602 (by Graf, 2011: 511), Bois-Vieux (Jura).

Unio zoasthenus — Rochebrune (1903)
Unio mancus — Germain (1931)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio mancus mancus — Prie (2012)
Unio nanus — Lopes-Lima et al. (2024)

Unio juranus ‘Locard’ of Authors

(error for Unio jurianus Locard, 1889)
‘Locard’ of Authors.
Locard, 1893. Coqu. Eau Douce Saumâtre France: 157.
Germain, 1931. Faune de France 22: 725.

Unio hassiae Haas, 1908

Haas, 1908. Nachr. Bl. Dtsch. Malak. Ges. 40: 175.
LECTOTYPE SMF 15713 (by Zilch, 1967: 56), Stockstadt-Erfelder Altrhein, Germany.

Unio batavus hassiae — Kobelt & Haas (1910)
Unio crassus batavus — Haas (1940), Haas (1969)
Crassiana hassiae — Gozhik (2006)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio pseudocrassus Haas, 1909

Haas, 1909. Beitr. Kenntn. Mittleleurop. Najadeen, Beilage zu... 41: 29.

Unio batavus pseudocrassus — Kobelt & Haas (1910)
Unio crassus batavus — Haas (1940), Haas (1969)
Crassiana pseudocrassa — Gozhik (2006)
Unio nanus — Lopes-Lima et al. (2024)

Unio brandisi Kobelt, 1910

Kobelt, 1910. Icon. Land- und Süssw.-Moll. 15: 82, pl. 419, figs. 2434-2435.
LECTOTYPE SMF 10890 (by Zilch, 1967: 61), Bosna River, Lašva, Bosnia and Herzegovina.

Unio brandisi — Kobelt (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio (Crassiana) crassus — Vinarski & Kantor (2016)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio travnicensis Kobelt, 1910

Kobelt, 1910. Icon. Land- und Süssw.-Moll. 15: 83, pl. 420, figs. 2436-2438.

Unio travnicensis — Kobelt (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio batavus badensis Haas, 1910

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Haas, 1910. Mitteleur. Najad., Beiträge Nachr. Bl. Dtsch. Malak. Ges. (4): 60.
HOLOTYPE SMF 11006, Saalbach River, Philippsburg, Germany.

Unio batavus badensis — Haas (1910)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio batavus sabulosus Haas, 1910

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Haas, 1910. Mitteleur. Najad., Beiträge Nachr. Bl. Dtsch. Malak. Ges. (4): 59.

Unio batavus sabulosus — Haas (1910)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio batavus forma elongata Clessin, 1910

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807; homonym of Unio elongata Lamarck, 1819)
Clessin, 1910. Nachr. Bl. Dtsch. Malak. Ges. 42: 66.
SYNTYPE SMF 10930, Danube River, Regensburg, Germany.

Unio consentaneus elongatus — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio consentaneus abnobae Kobelt & Haas, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 23, pl. 458, figs. 2473-2477.
LECTOTYPE SMF 10924 (by Zilch, 1967: 60), Beuron, Germany.

Unio consentaneus abnobae — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio consentaneus biandeti Kobelt & Haas, 1910

(incorrect original spelling of Unio consentaneus biaudeti Kobelt & Haas, 1910)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 22, pl. 457, fig. 2470.

Unio consentaneus biandeti — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio consentaneus biaudeti Kobelt & Haas, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836; correct name for Unio consentaneus biandeti Kobelt & Haas, 1910)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 22, pl. 457, fig. 2470 [as ‘biandeti’].
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: index, “Druckfehler-Berichtigung”.
HOLOTYPE SMF 10921, Rhone River, Illarsaz, Switzerland.

Unio nanus — Nagel (2025)

Unio consentaneus bodamicus Kobelt & Haas, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 21, pl. 456, figs. 2465-2466.

Unio consentaneus bodamicus — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Crassiana bodamica — Gozhik (2006)
Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus dilatatus Kobelt & Haas, 1910

(homonym of Unio (Eurynia) dilatata Rafinesque, 1820)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 18, pl. 453, figs. 2447-2448; 23, pl. 457, fig. 2472.
LECTOTYPE SMF 10904, Lake Thun, Switzerland.

Unio consentaneus dilatatus — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio consentaneus elongatus Kobelt & Haas, 1910

(homonym of Unio elongata Lamarck, 1819; intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 20, pl. 455, figs. 241.
HOLOTYPE SMF 10916, Reuss River, Lucerne, Switzerland.

Unio consentaneus elongatus — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio consentaneus hohenwarti Kobelt, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Kobelt, 1910. Icon. Land- und Süssw.-Moll. 15: 78, pl. 418, fig. 2427.

Unio consentaneus hohenwarti — Kobelt (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus langi Kobelt, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Kobelt, 1910. Icon. Land- und Süssw.-Moll. 15: 70, pl. 415, fig. 2414.
HOLOTYPE SMF 10882, Nitra, Slovakia.

Unio consentaneus var. langi — Kobelt (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio consentaneus marisaensis Kobelt & Haas, 1910

Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 57, pl. 479, figs. 2559-2562.
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: pl. 479 [caption, as “marisensis”].

Unio consentaneus marisaensis — Kobelt & Haas (1910)
Unio crassus cytherea — Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus subterminalis Kobelt, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Kobelt, 1910. Icon. Land- und Süssw.-Moll. 15: 80, pl. 418, fig. 2429.

Unio consentaneus subterminalis — Kobelt (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio consentaneus thayacus Kobelt, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836)
Kobelt, 1910. Icon. Land- und Süssw.-Moll. 15: 69, pl. 414, figs. 2410-2411; pl. 415, fig. 2413.

Unio consentaneus var. thayacus — Kobelt (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio (consentaneus var. ?) gallensteini Kobelt, 1910

(intro'd as intra-sp. of Unio consentaneus Rossmässler, 1836; homonym of Unio lijacensis var. gallensteini Kobelt, 1890)
Kobelt, 1910. Icon. Land- und Süssw.-Moll. 15: 79, pl. 418, fig. 2428.
HOLOTYPE SMF 10889, Busenka River, Slovenia.

Unio (consentaneus var. ?) gallensteini — Kobelt (1910)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio batavus hexameri Haas, 1911

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Haas, 1911. Verh. Naturhist. Ver. Preuß. Rheinl. 68: 526, pl. 4, fig. 2.

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

Unio batavus palatinus Haas, 1911

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Haas, 1911. Verh. Naturhist. Ver. Preuß. Rheinl. 68: 525, pl. 4, fig. 3.

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

Unio batavus probavaricus Haas, 1911

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Haas, 1911. Verh. Naturhist. Ver. Preuß. Rheinl. 68: 526, pl. 4, fig. 9.

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

Unio batavus forma pseudoconsentaneus Geyer, 1911

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Geyer, 1911. Jh. Ver. Vaterl. Naturkde. Württemb. 67: 365, pl. 5, fig. 3.

Unio crassus batavus — Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio batavus distinguendus C. Boettger, 1912

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
C. Boettger, 1912. Arch. Naturg. 78: 305, pl. 1, fig. 7.
LECTOTYPE SMF 15582 (by Zilch, 1967: 55), Prims River, near Primsweiler, Germany.

Unio crassus batavus — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024), Nagel (2025)

Unio batavus navensis C. Boettger, 1912

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
C. Boettger, 1912. Arch. Naturg. 78: 305, pl. 5, figs. 1-3.

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

Unio batavus kobeltianus Haas, 1913

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Haas, 1913. Nachr. Bl. Dtsch. Malak. Ges. 45: 105.

Unio batavus kobeltianus — Haas (1913)
Unio crassus batavus — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio crassus ‘Philippson’ of Authors

(misidentified reference to Unio crassus Philipsson in Retzius, 1788)
‘Philippson’ of Authors.
Soroka, 2005. Zool. Sci. 22: 1138, Table 1.
Soroka, 2010. Folia Malac. 18(4): Table 2. [in part]
Reis et al., 2013. Graellsia 69(1): 22, Table 2.
Prié & Puillandre, 2014. Hydrobiologia 735(1): online resource 1 [as ‘Unio crassus crassus’].
Douda et al., 2014. J. Appl. Ecol. 51: 1087. [in part]
Froufe et al., 2016. Org Divers Evol 16(3): 606, fig. 3. [in part]
Klishko et al., 2017. Zootaxa 4286(1): 98, Table 3.
Soroka & Burzynski, 2017. mtDNA B 2(2): 863.
Burzynski et al., 2017. MPE 107: 606.
Lopes-Lima et al., 2017. Biol. Rev. 92(1): Table S1 [as ‘Unio crassus crassus’]. [in part]
Araujo et al., 2018. J. Linn. Soc., Zool. 182(2): supplementary table. [in part]
Klishko et al., 2018. Systemat. Biodiv. 16(3): 291.
Burzynski & Soroka, 2018. PeerJ 6, e5573: 3.
Wang et al., 2018. Conserv. Genet. Resour. 10(4): 611.
Wang et al., 2018. Conserv. Genet. Resour. 11: 140.
Cha et al., 2018. mtDNA B 3(2): 946.
Aunins et al., 2018. mtDNA B 3(2): 1125.
Wu et al., 2018. PLoS One 13(8), e0200956: 6. [in part]
Klishko et al., 2019. Ruthenica 29(1): 57, Table 1.
Wu et al., 2019. ZooKeys 812: 29.
Huang et al., 2019. MPE 130: Table S5. [in part]
Fukata & Iigo, 2019. mtDNA B 4(2): 3489.
Guerra et al., 2019. BMC Evol. Biol. 19 (229): Table S1.
Froufe et al., 2019. Heredity 124: 185.
Soroka, 2020. J. Zool. Syst. Evol. Res. 58(2): Table 2.
Fukata & Iigo, 2020. mtDNA B 5(2): 1216.
Sano et al., 2020. Plankton Benthos Res. 15(2): 99.
Wu et al., 2020. Invert. Syst. 34: Table S2.
Kilikowska et al., 2020. Life 10(7): 1. [in part]
Lopes-Lima et al., 2021. MPE 163: fig. 6 [by voucher number]. [in part]
Sayenko et al., 2021. Systemat. Biodiv. 19: 58, Table 1.
Wu et al., 2021. J. Lake Sci. 33(6): attached Table 2.
Zieritz et al., 2021. Zool. J. Linn. Soc. 193(3): 1092.
Kim et al., 2021. mtDNA B 6(1): 80.
Pfarrer et al., 2022. Hydrobiologia 849: ESM1.
Wu et al., 2022. Zool. Scripta 51: Table S2.
Dai et al., 2023. Invert. Syst. 37(2): Table 2.
Chen et al., 2023. ZooKeys 1173: Table 1.
Wu et al., 2023. Org Divers Evol (2023): Table 2.
Dai et al., 2024. Zool. Scripta 53: Table 1.
Wu et al., 2024. J. Zool. Syst. Evol. Res. 2024, 1499508: Table 2.
Wu et al., 2024. Zool. Scripta 53(5): Table S3.
Dai et al., 2024. Invert. Syst. 38(6): Table 3. [in part]
Chen et al., 2025. Zoosyst. Evol. 101(4): Tables S2-S3.
Dai et al., 2025. Zoosyst. Evol. 101(2): Tables 1-2.
Chen et al., 2025. Zoosyst. Evol. 101(4): Table 1.
Wang et al., 2025. Zoosyst. Evol. 101(4): Table S2.
Klymus et al., 2025. mtDNA B 10(6): Table 1.
Hou et al., 2025. Invert. Syst. 39(7), IS25025: Table S3.
Campbell & Lydeard, 2026. Malacologia 68(1/2): 294. [in part]
Wu et al., 2026. Contributions to Zoology 95: Table S2.
Wu et al., 2026. Zool. Scripta: Table S4.

Unio nanus — Lopes-Lima et al. (2024)

Mya ovata Studer in Coxe, 1789

Studer in Coxe, 1789. unknown publication: 392. [nomen nudum]

Unio nanus — Lopes-Lima et al. (2024)

Mya pictorum Coxe, 1789

(misidentified reference to Mya pictorum Linnaeus, 1758)
Coxe, 1789. unknown publication: 392. [nomen nudum]

Unio nanus — Lopes-Lima et al. (2024)

Unio dubius Fitzinger, 1833

Fitzinger, 1833. Syst, Verz. Österr. Weichth.: 119. [nomen nudum]

Unio (sec. Lymnium) pictorum — Simpson (1900)
Unio (sec. Lymnium) (Group U. pictorum) pictorum — Simpson (1914)
Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio nigricans Fitzinger, 1833

Fitzinger, 1833. Syst, Verz. Österr. Weichth.: 119. [nomen nudum]

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio vitreus Rossmässler, 1835

(intro'd as syn of Mya batava Maton & Rackett, 1807)
‘Stenz’ Rossmässler, 1835. Icon. Land- und Süssw.-Moll. 1 (2): 21.

Unio crassus cytherea — Haas (1940), Haas (1969)
Unio nanus — Lopes-Lima et al. (2024)

Unio ripario Philippi, 1847

(error for Unio riparia Pfeiffer, 1821)
‘Pfr’ Philippi, 1847. Zeitschr. f. Malakozool. 4(6): 95.

Unio pescinalis Lea, 1852

(error for Unio piscinalis Rossmässler, 1836)
‘Zieg.’ Lea, 1852. Synopsis Fam. Naiades: 30.

Unio labacencis Lea, 1870

(error for Unio labacensis Rossmässler, 1835)
‘Pfeif. Mühl.’ Lea, 1870. Synopsis Fam. Naiades: 47.

Unio dubisanus Locard, 1882

(incorrect original spelling of Unio dubisianus Locard, 1882)
‘Coutagne’ Locard, 1882. Prodr. Malac. Franç. 1: 291.

Unio dubisopsis Locard, 1882

(incorrect original spelling of Unio dubisiopsis Locard, 1882)
Locard, 1882. Prodr. Malac. Franç. 1: 291.

Unio neocomiensis Kobelt, 1886

(error for Unio neocomensis Drouët, 1881)
‘Drouët’ Kobelt, 1886. Icon. Land- und Süssw.-Moll. 2: 34.

Unio ampulodon Locard, 1889

(intro'd as syn of Unio dubisianopsis Locard, 1889)
‘Coutagne Mss. teste Bourguignat’ Locard, 1889. Contr. Faune Malacol. Franc. 13: 128 [22]. [nomen nudum]

Unio mancus var. amnicus — Germain (1931)

Unio dubisianopsis Locard, 1889

(error for Unio dubisiopsis Locard, 1882)
Locard, 1889. Contr. Faune Malacol. Franc. 13: 128 [22].
Locard, 1893. Coqu. Eau Douce Saumâtre France: 155.

Unio consentaneus marisensis Kobelt & Haas, 1910

(incorrect original spelling of Unio consentaneus marisaensis Kobelt & Haas, 1910)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: pl. 479 [caption].

Unio nubilius Germain, 1931

(error for Unio nubilus Locard, 1889)
‘Locard’ Germain, 1931. Faune de France 22: 727.

Unio valleriacus ‘Bourg. in Loc.’ Germain, 1931

(error for Unio valliericus Bourguignat in Locard, 1889)
‘Bourg. in Loc.’ Germain, 1931. Faune de France 22: 727.

Unio crassus consentancus Zhadin, 1938

(error for Unio consentaneus Rossmässler, 1836)
‘Ziegler’ Zhadin, 1938. Faune USSR Mollusques 4(1): 91.

Unio zoasthenicus Haas, 1940

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

Unio passaranti ‘Bourguignat in Locard’ Prie, 2012

(error for Unio passavanti Bourguignat in Locard, 1889)
‘Bourguignat in Locard’ Prie, 2012. MalaCo 8: 433.

Unio batavus var. elongatulus Of Authors

(error for Unio batavus var. elongatus Held, 1837)