Selected synonymic references
Cyttarocylis Hebe var. apophysata: Cleve, 1900b
Cyttarocylis triton: Zacharias, 1906
Ptychocylis (Rhabdonella) apophysata: Brandt, 1906-1907
Ptychocylis (Rhabdonella) apophysata var. b: Brandt, 1906-1907
Rhabdonella apophysata: Jörgensen, 1924
Rhabdonellopsis apophysata: Kofoid and Campbell, 1929; Souto, 1970a; 1979
Rhabdonellopsis intermedia: Kofoid and Campbell, 1929, 1939
Rhabdonellopsis longicaulis: Kofoid and Campbell, 1929, 1939
Rhabdonellopsis triton: Kofoid and Campbell, 1929, 1939