Bivalvia | Unionida | Unionoidea | Unionidae | Ambleminae | Lampsilini | Potamilus
2 specimens + 30 GenBank vouchers

Frierson, 1898. Nautilus 11(10): 109, pl. 1.
Frierson, 1927. Check List N. Amer. Naiades: 87, sp. 395.
Type(s): HOLOTYPE USNM_159935, Sabine R., Logansport, La.
Lampsilis (Proptera) amphichænus — Simpson (1900)
Lampsilis (Proptera) amphichaena — Simpson (1914)
Proptera amphichaena — Frierson (1927), Haas (1969)
Leptodea amphichaena — Burch (1975), ITIS (2012)
Potamilus amphichaenus — Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), Howells et al. (1996), IUCN (1996), ... FMCS (2021), de Moulpied et al. (2022), Hopper et al. (2023), FMCS (2025), Campbell & Lydeard (2026)
Lampsilis (Proptera) amphichænus — Simpson (1900)
Lampsilis (Proptera) amphichaena — Simpson (1914)
Proptera amphichaena — Frierson (1927), Haas (1969)
Leptodea amphichaena — Burch (1975), ITIS (2012)
Potamilus amphichaenus — Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), Howells et al. (1996), IUCN (1996), ... FMCS (2021), de Moulpied et al. (2022), Hopper et al. (2023), FMCS (2025), Campbell & Lydeard (2026)