Piscicolidae Johnston, 1865
Trachelobdella alcibiades (Leigh-Sharpe, 1933)
Trachelobdella australis Blanchard, 1900
Trachelobdella bathyrajae Meyer & Burreson, 1990
Trachelobdella leptocephali Ingram, 1957
Trachelobdella livanovi (Oka, 1910)
Trachelobdella lubrica (Grube, 1840)
Trachelobdella luederitzi Augener, 1936
Trachelobdella maculata Moore, 1898
Trachelobdella okae Moore, 1924
Trachelobdella oregonensis Burreson, 1976
Trachelobdella rugosa Moore, 1898
