1. Genus Antarctoneptunea Dell, 1972
   1. Species Antarctoneptunea aurora (Hedley, 1916)
   2. Species Antarctoneptunea benthicola (Dell, 1956)
2. Genus Kelletia P. Fischer, 1884
   1. Species Kelletia kelletii (Forbes, 1852)
   2. Species Kelletia lischkei Kuroda, 1938
3. Genus Penion P. Fischer, 1884
   1. Species Penion chathamensis (A. W. B. Powell, 1938)
   2. Species Penion cuvierianus (A. W. B. Powell, 1927)
      1. Subspecies Penion cuvierianus cuvierianus (A. W. B. Powell, 1927)
      2. Subspecies Penion cuvierianus jeakingsi (A. W. B. Powell, 1947) accepted as Penion ormesi (A. W. B. Powell, 1927) (synonym)
   3. Species Penion lineatus B. A. Marshall, Hills & Vaux, 2018
   4. Species Penion mandarinus (Duclos, 1832)
   5. Species Penion maximus (Tryon, 1881)
   6. Species Penion ormesi (A. W. B. Powell, 1927)
   7. Species Penion sulcatus (Lamarck, 1816)
      1. Subspecies Penion sulcatus mandarinus (Duclos, 1832) accepted as Penion mandarinus (Duclos, 1832) (superseded combination)
      2. Subspecies Penion sulcatus sulcatus (Lamarck, 1816) accepted as Penion sulcatus (Lamarck, 1816) (superseded combination)
   8. Subgenus Penion (Austrosipho) Cossmann, 1906 accepted as Penion P. Fischer, 1884 (junior subjective synonym)
   9. Species Penion adustus (R. A. Philippi, 1845) accepted as Penion sulcatus (Lamarck, 1816) (synonym)
   10. Species Penion benthicolus Dell, 1956 accepted as Antarctoneptunea benthicola (Dell, 1956) (superseded combination)
       1. Subspecies Penion benthicolus delli A. W. B. Powell, 1971 accepted as Penion benthicolus Dell, 1956 (junior subjective synonym)
   11. Species Penion dilatatus (Quoy & Gaimard, 1833) accepted as Penion sulcatus (Lamarck, 1816) (synonym)
   12. Species Penion fairfieldae (A. W. B. Powell, 1947) accepted as Penion chathamensis (A. W. B. Powell, 1938) (junior subjective synonym)
4. Genus Serratifusus Darragh, 1969
   1. Species Serratifusus excelens Fraussen & Hadorn, 2003
   2. Species Serratifusus harasewychi Fraussen & Hadorn, 2003
   3. Species Serratifusus lineatus Harasewych, 1991
   4. Species Serratifusus sitanius Fraussen & Hadorn, 2003
   5. Species Serratifusus virginiae Harasewych, 1991
5. Genus Austrosipho Cossmann, 1906 accepted as Penion P. Fischer, 1884 (junior subjective synonym)
   1. Subgenus Austrosipho (Verconella) Iredale, 1914 accepted as Penion P. Fischer, 1884 (unnecessary substitute name for Penion, by Iredale assumed to be a junior homonym of Penium Philippi, 1865)
      1. Species Austrosipho (Verconella) chathamensis A. W. B. Powell, 1938 accepted as Penion chathamensis (A. W. B. Powell, 1938) (superseded combination)
6. Genus Berylsma Iredale, 1924 accepted as Penion P. Fischer, 1884 (junior subjective synonym)
   1. Species Berylsma grandis (Gray, 1839) accepted as Penion mandarinus (Duclos, 1832)
      1. Subspecies Berylsma grandis levifida Iredale, 1925 accepted as Penion mandarinus (Duclos, 1832) (junior subjective synonym)
7. Genus Largisipho Iredale, 1929 accepted as Penion P. Fischer, 1884 (junior subjective synonym)
   1. Species Largisipho oligostira (Tate, 1891) accepted as Penion mandarinus (Duclos, 1832) (synonym)
      1. Subspecies Largisipho oligostira spectanda Iredale, 1929 accepted as Penion mandarinus (Duclos, 1832) (junior subjective synonym)
8. Genus Verconella Iredale, 1914 accepted as Penion P. Fischer, 1884 (unnecessary substitute name for Penion, by Iredale assumed to be a junior homonym of Penium Philippi, 1865.)
   1. Species Verconella adpressa A. W. B. Powell, 1947 accepted as Penion sulcatus (Lamarck, 1816) (junior subjective synonym)
   2. Species Verconella adusta (R. A. Philippi, 1845) accepted as Penion sulcatus (Lamarck, 1816) (synonym)
      1. Variety Verconella adusta var. mandarinoides A. W. B. Powell, 1927 accepted as Penion sulcatus (Lamarck, 1816) (junior subjective synonym)
      2. Subspecies Verconella adusta worthyae A. W. B. Powell, 1947 accepted as Penion sulcatus (Lamarck, 1816) (junior subjective synonym)
   3. Species Verconella compta H. J. Finlay, 1924 accepted as Aeneator comptus (H. J. Finlay, 1924) (superseded combination)
   4. Species Verconella dilatata (Quoy & Gaimard, 1833) accepted as Penion sulcatus (Lamarck, 1816) (synonym)
      1. Subspecies Verconella dilatata rex H. J. Finlay, 1926 accepted as Penion cuvierianus (A. W. B. Powell, 1927) (synonym)
      2. Variety Verconella dilatata var. cuvieriana A. W. B. Powell, 1927 accepted as Penion cuvierianus (A. W. B. Powell, 1927) (superseded combination)
      3. Variety Verconella dilatata var. elongata A. W. B. Powell, 1927 accepted as Penion cuvierianus (A. W. B. Powell, 1927) (junior subjective synonym)
      4. Variety Verconella dilatata var. rotunda A. W. B. Powell, 1927 accepted as Penion cuvierianus (A. W. B. Powell, 1927) (junior subjective synonym)
   5. Species Verconella dispar A. W. B. Powell, 1947 accepted as Penion ormesi (A. W. B. Powell, 1927) (junior subjective synonym)
   6. Species Verconella elongata A. W. B. Powell, 1927 accepted as Penion cuvierianus (A. W. B. Powell, 1927) (junior subjective synonym)
   7. Species Verconella fairfieldae A. W. B. Powell, 1947 accepted as Penion chathamensis (A. W. B. Powell, 1938) (junior subjective synonym)
   8. Species Verconella jeakingsi A. W. B. Powell, 1947 accepted as Penion cuvierianus jeakingsi (A. W. B. Powell, 1947) (junior subjective synonym)
   9. Species Verconella ormesi A. W. B. Powell, 1927 accepted as Penion ormesi (A. W. B. Powell, 1927) (superseded combination)

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