Bivalvia | Unionida | Unionoidea | Unionidae | Ambleminae | Lampsilini | Arotonaias
Mørch, 1861. Malak. Blatt. 7: 205.
(homonym of Unio imbricatus Hislop, 1860)
Plagiola imbricatus — Simpson (1900)
Unio (Arotonaias) imbricatus — Martens (1900)
Plagiola (Arotonaias) imbricata — Simpson (1914)
Arotonaias imbricata — Frierson (1927), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021)
Pachynaias imbricata — Haas (1929)
Arotonaias encarpa — Cummings et al. (2025)

Lea, 1868. Proc. Acad. Nat. Sci. 20: 95.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 294 [54], pl. 42, fig. 105.
Type(s): LECTOTYPE USNM_84386 (by Johnson & Baker, 1973: 154), L. Nicaragua.
Plagiola (Ptychoderma) encarpus — Simpson (1900)
Unio (Arotonaias) imbricatus — Martens (1900)
Plagiola (Arotonaias) imbricata — Simpson (1914)
Arotonaias imbricata — Frierson (1927)
Arotonaias encarpa — Cummings et al. (2025)
Plagiola (Ptychoderma) encarpus — Simpson (1900)
Plagiola imbricatus — Simpson (1900)
Unio (Arotonaias) imbricatus — Martens (1900)
Plagiola (Arotonaias) imbricata — Simpson (1914)
Arotonaias imbricata — Frierson (1927), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021)
Pachynaias imbricata — Haas (1929)
Arotonaias encarpa — Cummings et al. (2025)