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nominal species Unio batavus probavaricus Haas, 1912

Unio batavus probavaricus Haas, 1912 = Unio nanus

(intro'd as intra-sp. of Mya batava Maton & Rackett, 1807)
Haas, 1912. Verh. Naturhist. Ver. Preuß. Rheinl. 68: 526, pl. 4, fig. 9.
HOLOTYPE SMF 11005, Gersprenz River, near Ohlenbach, Germany.

Taxonomic Opinions

+ Unio nanus Lamarck, 1819 — Nagel, 2025: 137, fig. 107.

holotype SMF 11005/1 — Germany, “im östlichen Odenwalde, in der Gersprenz der Mümling und der Mudau”, restricted to “Gersprenz bei Ohlenbach” [Gersprenz stream] according to the legend of the holotype figure (”Typus!”). (coll. F. Haas, leg. Eidtmann 1909)

+ Unio nanus Lamarck, 1819 — Lopes-Lima et al., 2024: suppl. append. 2, p. 21.

+ Unio crassus batavus Maton & Rackett — Haas, 1969: 51.

+ Unio crassus batavus (Maton & Rackett, 1807) — Haas, 1940: 131.