1. Subgenus Ambostracon (Ambostracon) Hazel, 1962
   1. Species Ambostracon (Ambostracon) vermillionense Swain, 1967
   2. Species Ambostracon (Ambostracon) flabellicostata (Brady, 1880) accepted as Ambostracon (Ambostracon) flabellicostatum (Brady, 1880) represented as Ambostracon flabellicostatum (Brady, 1880) (unaccepted > misspelling - incorrect subsequent spelling, misspelling, new combination)
   3. Species Ambostracon (Ambostracon) glauca (Skogsberg, 1928) accepted as Radimella glauca (Skogsberg, 1928) (new combination)
   4. Species Ambostracon (Ambostracon) glaucum (Skogsberg, 1928) accepted as Radimella glauca (Skogsberg, 1928) (new combination)
   5. Species Ambostracon (Ambostracon) flabellicostatum (Brady, 1880) represented as Ambostracon flabellicostatum (Brady, 1880)
   6. Species Ambostracon (Ambostracon) hulingsi Mckenzie & Swain, 1967 represented as Ambostracon hulingsi McKenzie & Swain, 1967
2. Species Ambostracon amberii (Carbonnel, 1969) Maybury & Whatley, 1986
3. Species Ambostracon ataxia Whatley, Moguilevsky, Toy, Chadwick & Ramos, 1997
4. Species Ambostracon bertelsae (Sanguinetti, Ornellas & Coimbra, 1991)
5. Species Ambostracon exmouthensis (Hartmann, 1978)
6. Species Ambostracon flabellicostatum (Brady, 1880)
7. Species Ambostracon hulingsi McKenzie & Swain, 1967
8. Species Ambostracon ikeyai Yajima, 1978
9. Species Ambostracon keeleri Dingle, 1992
10. Species Ambostracon lauca (Skogsberg, 1928)
11. Species Ambostracon tneedsmuirense Brouwers, 1993
12. Species Ambostracon vermillionense Swain, 1967
13. Species Ambostracon yujangi Hu & Tao, 2008
14. Subgenus Ambostracon (Patagonacythere) Hartmann, 1962 accepted as Patagonacythere Hartmann, 1962 (taxon accepted at genus level)
    1. Species Ambostracon (Patagonacythere) devexa (Müller, 1908) accepted as Patagonacythere devexa (Müller, 1908) accepted as Australicythere devexa (Müller, 1908) (superseded combination)
    2. Species Ambostracon (Patagonacythere) longiductus (Skogsberg, 1928) accepted as Patagonacythere longiducta (Skogsberg, 1928) (superseded recombination)
    3. Species Ambostracon (Patagonacythere) pumila (Brady, 1880) Valicenti, 1977 accepted as Hemingwayella pumilio (Brady, 1880) Whatley & Maybury, 1991 (superseded recombination)
    4. Species Ambostracon (Patagonacythere) pumilum (Brady, 1880) Valicenti, 1977 accepted as Hemingwayella pumilio (Brady, 1880) Whatley & Maybury, 1991 (superseded recombination)
    5. Species Ambostracon (Patagonacythere) tricostata (Hartmann, 1962) Valicenti, 1977 accepted as Patagonacythere tricostata Hartmann, 1962 (old combination)
    6. Species Ambostracon (Patagonacythere) tricostatum (Hartmann, 1962) Valicenti, 1977 accepted as Patagonacythere tricostata Hartmann, 1962 (misspelling)
    7. Species Ambostracon (Patagonacythere) wyvillethomsoni (Brady, 1880) Valicenti, 1977 accepted as Patagonacythere wyvillethomsoni (Brady, 1880) (superseded recombination)
15. Species Ambostracon flabellicostata (Brady, 1880) Valicenti, 1977 accepted as Ambostracon flabellicostatum (Brady, 1880) (misspelling, new combination)
16. Species Ambostracon glauca (Skogsberg, 1928) accepted as Radimella glauca (Skogsberg, 1928) (new combination)
17. Species Ambostracon glaucum (Skogsberg, 1928) accepted as Radimella glauca (Skogsberg, 1928) (superseded combination)
18. Species Ambostracon pumila (Brady, 1866) accepted as Ambolus pumilus (Brady, 1866) (misspelling, new combination)
19. Species Ambostracon pumilum (Brady, 1866) accepted as Ambolus pumilus (Brady, 1866) (unaccepted > superseded combination)
20. Species Ambostracon tneedsmuirensis Brouwers, 1993 accepted as Ambostracon tneedsmuirense Brouwers, 1993 (misspelling)
21. Species Ambostracon tricostata Hartmann, 1962 accepted as Patagonacythere tricostata Hartmann, 1962 (superseded original combination)

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