- Adjua Chaper, 1885 (original rank)
- Carychiopsis E. von Martens, 1895 junior subjective synonym (invalid; not Sandberger, 1872)
- Ennea H. Adams & A. Adams, 1855
- Ennea (Carychiopsis) E. von Martens, 1895 junior homonym (invalid; not Sandberger, 1872)
- Ennea (Enneastrum) L. Pfeiffer, 1856 junior subjective synonym
- Ennea (Excisa) d'Ailly, 1896 (original combination)
- Ennea (Ptychotrema) L. Pfeiffer, 1853 (inverted precedence of genus and subgenus)
- Enneastrum L. Pfeiffer, 1856 junior subjective synonym
- Haplonepion Pilsbry, 1919
- Parennea Pilsbry, 1919
- Ptychotrema (Adjua) Chaper, 1885 · alternative representation
- Ptychotrema (Aduja) misspelling - incorrect subsequent spelling
- Ptychotrema (Ennea) H. Adams & A. Adams, 1855 alternative representation
- Ptychotrema (Excisa) d'Ailly, 1896 alternative representation
- Ptychotrema (Haplonepion) Pilsbry, 1919 alternative representation
- Ptychotrema (Nsendwea) Dupuis & Putzeys, 1923 alternative representation
- Ptychotrema (Parennea) Pilsbry, 1919 alternative representation
- Ptychotrema (Ptychoon) Pilsbry, 1919 alternative representation
- Ptychotrema (Ptychotrema) L. Pfeiffer, 1853 alternative representation
- Ptychotrema (Sinistrexcisa) de Winter, Gómez & Prieto, 1999 alternative representation
- Pupa (Ennea) H. Adams & A. Adams, 1855 (original rank)
- Sinistrexcisa de Winter, Gómez & Prieto, 1999
- Streptostele (Ptychotrema) L. Pfeiffer, 1853 superseded combination
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