Selected synonymic references
Tintinnus ampulla: Fol, 1881
Petalotricha ampulla: Kent, 1882; Jörgensen, 1924; Kofoid and Campbell, 1929; Balech, 1959; 1962b; Souto, 1970a, 1979
Petalotricha ampulla var. b: Brandt, 1906-1907
Petalotricha ampulla var. c: Brandt, 1906-1907
Petalotricha ampulla var. d: Brandt, 1906-1907
Petalotricha ampulla var. major: Jörgensen, 1924
Petalotricha serrata: Kofoid and Campbell, 1929
Petalotricha major: Kofoid and Campbell, 1929, 1939
Petalotricha pacifica: Kofoid and Campbell, 1929, 1939