Acelis arctica Plehn, 1896 accepted as Plehnia arctica (Plehn, 1896)
Acelis Cryptocelididae Yeri & Kaburaki, 1918 accepted as Plehnia japonica Bock, 1923 accepted as Paraplehnia japonica (Bock, 1923)
Diplehnia caeca (Hyman, 1953)
Diplehnia caeca var. oculifera (Hyman, 1953)
Diplehnia pacifica (Kato, 1939) accepted as Paraplehnia pacifica (Kato, 1939)
Discocelides ellipsoides (Girard in Stimpson, 1854) accepted as Plehnia ellipsoides (Girard in Stimpson, 1854)
Discocelides ellipsoides (Girard, 1853) accepted as Plehnia ellipsoides (Girard in Stimpson, 1854)
Discocelides langi Bergendal, 1893
Myoramyxa pardalota Newman & Cannon, 1997
Nephtheaplana tropica (Hyman, 1959)
Paraplehnia japonica (Bock, 1923)
Paraplehnia pacifica (Kato, 1939)
Paraplehnia seisuiae Oya, Kimura & Kajihara, 2019
Plehnia arctica (Plehn, 1896)
Plehnia caeca Hyman, 1953 accepted as Diplehnia caeca (Hyman, 1953)
Plehnia caeca oculifera Hyman, 1953 accepted as Diplehnia caeca var. oculifera (Hyman, 1953)
Plehnia caeca var. oculifera Hyman, 1953 accepted as Diplehnia caeca var. oculifera (Hyman, 1953)
Plehnia ellipsoides (Girard in Stimpson, 1854)
Plehnia japonica Bock, 1923 accepted as Paraplehnia japonica (Bock, 1923)
Plehnia ovatus (Kato, 1937)
Plehnia pacifica Kato, 1939 accepted as Paraplehnia pacifica (Kato, 1939)
Plehnia tropica Hyman, 1950 accepted as Palaua tropica (Hyman, 1950) accepted as Nephtheaplana tropica (Hyman, 1959)