Selected synonymic references
Tintinnus caudatus: Ostenfeld, 1899a, b
Undella messinensis var. a: Brandt, 1906-1907
Undella (Parundella) caudata: Jörgensen, 1924
Undella (Parundella) aculeata: Jörgensen, 1924
Undella (Parundella) aculeata, forma longa: Jörgensen, 1924
Parundella caudata: Jörgensen; Kofoid and Campbell, 1929, 1939: Balech, 1971a; Souto, 1979
Parundella aculeata: Kofoid and Campbell, 1929
Parundella longa: Kofoid and Campbell, 1929
Parundella aculeata longa: Balech, 1971a
Parundella caudata longa: Souto, 1979
Parundella crassicaudata: Souto, 1979
? Undella pellucida: Jörgensen, 1899
? Parundella pellucida: Kofoid and Campbell, 1929; Souto, 1979