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nominal species Unio hassiae Haas, 1908

Unio hassiae Haas, 1908 = Unio nanus

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

Taxonomic Opinions

+ Unio nanus Lamarck, 1819 — Nagel, 2025: 114, fig. 59.

lectotype SMF 15713/1 (by Zilch, 1967: 55-56) — Germany, “Altrhein von Erfelden” [Stockstadt-Erfelder Altrhein = a cut-off meander of the Rhine, which nevertheless still has water flowing through it, 49°50’N 008°28’E] (coll. F. Haas)

paralectotype SMF 10994/1

paralectotype SMF 10995/1 — “Lampertheim”

paralectotype SMF 10990/1 — “Nackenheim”

+ Unio nanus Lamarck, 1819 — Lopes-Lima et al., 2024: suppl. append. 2, p. 20.

= Crassiana hassiae (Haas, 1910) — Gozhik, 2006: 187, pl. 8, figs. 7-8.

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

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

= Unio batavus hassiae Haas, 1908 — Kobelt & Haas, 1910: 41, pl. 469, fig. 2527.