Cyclas nitida Mighels & Adams, 1842
Mighels in Mighels & Adams, 1842. Proc. Boston Soc. Nat. Hist. 1: 39.
(homonym of Pisidium nitidum Jenyns, 1832; renamed Pisidium adamsii Stimpson, 1851)

Pisidium (Cyclocalyx) adamsi — Clarke (1973), Burch (1975)

Pisidium adamsii Stimpson, 1851
‘Prime, MS’ Stimpson, 1851. Shells of New England: 16.
Prime, 1852. Boston J. Nat. Hist. 6(3): 352, pl. 11, figs. 1-3.
Prime, 1865. Smithsonian Misc. Coll. (145): 63, fig. 63.
(new name for Cyclas nitida Mighels & Adams, 1842)

Pisidium adamsi — Herrington (1962), Mackie et al. (1980), Turgeon et al. (1998), Lee & Ó Foighil (2002), Schultheiß et al. (2008), Bogan (2010), ITIS (2012), Clewing et al. (2013), Saito et al. (2022)
Pisidium (Cyclocalyx) adamsi — Clarke (1973), Burch (1975), Cooley & Ó Foighil (2000), Bespalaya et al. (2017), Fuentealba-Jara et al. (2017)
Cyclocalyx adamsi — Lee & Ó Foighil (2003)
Euglesa (Cyclocalyx) adamsi — Mouthon & Forcellini (2017)

Pisidium affine Sterki, 1901
Sterki, 1901. Nautilus 15(6): ??.

Pisidium adamsi — Herrington (1962)
Pisidium (Cyclocalyx) adamsi — Burch (1975)

Pisidium sargenti Sterki, 1901
Sterki, 1901. Nautilus 15(6): ??.

Pisidium adamsi — Herrington (1962)
Pisidium (Cyclocalyx) adamsi — Burch (1975)

Pisidium sphaericum Sterki, 1912
Sterki, 1912. Nautilus 26(8): ??.

Pisidium adamsi — Herrington (1962)
Pisidium (Cyclocalyx) adamsi — Burch (1975)

Pisidium deflexum Sterki, 1922
Sterki, 1922. Ann. Carnegie Mus. 13(3/4): ??.

Pisidium adamsi — Herrington (1962)
Pisidium (Cyclocalyx) adamsi — Burch (1975)