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nominal species Unio besnardianus Bourguignat in Locard, 1889

Unio besnardianus Bourguignat in Locard, 1889 = Unio crassus

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 crassus

Taxonomic Opinions

+ Unio crassus Philipsson in Retzius, 1788 — Lopes-Lima et al., 2024

+ Unio crassus batavus (Maton & Rackett, 1807) — Haas, 1969

+ Unio crassus batavus (Maton & Rackett, 1807) — Haas, 1940

+ Unio batavus Maton et Rackett — Germain, 1931

+ — Simpson, 1914

+ Unio (Batavusiana) besnardi Servain (nom. em.) — Germain, 1904

= Unio (Groupe de l’U. batavus) besnardinus [sic] Servain — Locard, 1893

= Unio besnardianus Servain in Locard, 1889 — Westerlund, 1890

= Unio (Batavusiana) besnardianus Servain — Locard, 1889

= Unio (Bataviana) besnardianus Servain — Servain, 1888