Selected synonymic references
Codonella orthoceras: Haeckel, 1873; Brandt, 1906-1907
Codonella orthoceras var. a tessellata: Brandt, 1906-1907
Codonella orthoceras var. b: Brandt, 1906-1907
Codonella orthoceras var. c: Brandt, 1906-1907
Codonella orthoceras var. d: Brandt, 1906-1907
Codonella orthoceras var. e: Brandt, 1906-1907
Codonella orthoceras var. f minor: Brandt, 1906-1907
Codonella orthoceras var. k: Brandt, 1906-1907
Codonella orthoceras var. l pacifica: Brandt, 1906-1907
Codonella orthoceras var. i: Brandt, 1906-1907
Codonella orthoceras var. h: Brandt, 1906-1907
Codonella orthoceras var. g pura: Brandt, 1906-1907
Codonellopsis orthoceras: Jörgensen, 1924; Kofoid and Campbell, 1929; Balech, 1959; Souto, 1979
Codonellopsis minor: Kofoid and Campbell, 1929, 1939
Codonellopsis pacifica: Kofoid and Campbell, 1929, 1939
Codonellopsis pura: Kofoid and Campbell, 1929, 1939
Codonellopsis tessellata: Kofoid and Campbell, 1929, 1939
Codonellopsis longa: Kofoid and Campbell, 1929, 1939
Codonellopsis meridionalis: Kofoid and Campbell, 1929, 1939
Codonellopsis speciosa: Kofoid and Campbell, 1929, 1939
Codonellopsis californiensis: Kofoid and Campbell, 1929, 1939
Codonellopsis inflata: Kofoid and Campbell, 1929, 1939
Codonellopsis parva: Kofoid and Campbell, 1929, 1939