nominal species Unio prolongatus Drouët, 1894
Drouët, 1894, Rev. Biol. Nord France 6: 216, fig. 1.
Drouët, 1895, J. de Conch. 43: 36, sp. 111.
(homonym of Unio calamitarum var. B prolongata Fischer & Crosse, 1894)
= Rectidens lingulatus Taxonomic Opinions
+ Rectidens lingulatus (Drouët & Chaper, 1892) — (Graf & Cummings, 2007)
= Rectidens lingulatus prolongatus (Drouet, 1894) — (Haas, 1969)
= Rectidens prolongatus (Drouet, 1894) — (Haas, 1969)
= Rectidens prolongatus (Drouet) — (Thiele, 1934)
= Rectidens prolongatus (Drouet, 1894) — (Simpson, 1914)
= Rectidens prolongatus (Drouet, 1894) — (Haas, 1914)
= Rectidens prolongatus (Drouet, 1894) — (Simpson, 1900)
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