1. Species Obliquaria reflexa Rafinesque, 1820
2. Subgenus Obliquaria (Aximedia) Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
   1. Species Obliquaria (Aximedia) teneltus Rafinesque, 1831 accepted as Villosa taeniata (Conrad, 1834) accepted as Cambarunio taeniatus taeniatus (Conrad, 1834)
   2. Species Obliquaria (Aximedia) venus Rafinesque, 1831 accepted as Elliptio crassidens (Lamarck, 1819)
3. Subgenus Obliquaria (Ellipsaria) Rafinesque, 1820 accepted as Ellipsaria Rafinesque, 1820 (original rank)
   1. Species Obliquaria (Ellipsaria) atroviolacea Rafinesque, 1820 accepted as Eurynia dilatata (Rafinesque, 1820)
   2. Species Obliquaria (Ellipsaria) attenuata Rafinesque, 1820 accepted as Ligumia nasuta (Say, 1817) accepted as Sagittunio nasutus (Say, 1817) (synonym)
   3. Species Obliquaria (Ellipsaria) cuprea Rafinesque, 1820 accepted as Eurynia dilatata (Rafinesque, 1820)
   4. Species Obliquaria (Ellipsaria) fasciolaris Rafinesque, 1820 accepted as Ptychobranchus fasciolaris (Rafinesque, 1820)
   5. Species Obliquaria (Ellipsaria) sinuata Rafinesque, 1820 accepted as Eurynia dilatata (Rafinesque, 1820)
   6. Species Obliquaria (Ellipsaria) verrucosa Rafinesque, 1820 accepted as Quadrula verrucosa (Rafinesque, 1820) (unaccepted > superseded combination)
4. Subgenus Obliquaria (Plagiola) Rafinesque, 1819 accepted as Ptychobranchus C. T. Simpson, 1900
   1. Species Obliquaria (Plagiola) decorticata Rafinesque, 1820 accepted as Glebula rotundata (Lamarck, 1819) (unaccepted > junior subjective synonym)
   2. Species Obliquaria (Plagiola) depressa Rafinesque, 1820 accepted as Ellipsaria lineolata (Rafinesque, 1820)
   3. Species Obliquaria (Plagiola) interrupta Rafinesque, 1820 accepted as Ptychobranchus fasciolaris (Rafinesque, 1820)
   4. Species Obliquaria (Plagiola) lineolata Rafinesque, 1820 accepted as Ellipsaria lineolata (Rafinesque, 1820)
5. Subgenus Obliquaria (Quadrula) Rafinesque, 1820 accepted as Quadrula Rafinesque, 1820 (original rank)
   1. Species Obliquaria (Quadrula) bullata Rafinesque, 1820 accepted as Rotundaria pustulosa (I. Lea, 1831) accepted as Cyclonaias pustulosa (I. Lea, 1831) accepted as Pustulosa pustulosa (I. Lea, 1831)
   2. Species Obliquaria (Quadrula) cyphya Rafinesque, 1820 accepted as Plethobasus cyphyus (Rafinesque, 1820)
   3. Species Obliquaria (Quadrula) flava Rafinesque, 1820 accepted as Fusconaia flava (Rafinesque, 1820)
   4. Species Obliquaria (Quadrula) flexuosa Rafinesque, 1820 accepted as Epioblasma flexuosa (Rafinesque, 1820)
   5. Species Obliquaria (Quadrula) metanevra Rafinesque, 1820 accepted as Theliderma metanevra (Rafinesque, 1820)
   6. Species Obliquaria (Quadrula) nodulata Rafinesque, 1820 accepted as Rotundaria nodulata (Rafinesque, 1820) accepted as Cyclonaias nodulata (Rafinesque, 1820) accepted as Pustulosa nodulata (Rafinesque, 1820)
   7. Species Obliquaria (Quadrula) quadrula Rafinesque, 1820 accepted as Quadrula quadrula (Rafinesque, 1820)
   8. Species Obliquaria (Quadrula) reflexa Rafinesque, 1820 accepted as Obliquaria reflexa Rafinesque, 1820
   9. Species Obliquaria (Quadrula) retusa Rafinesque, 1820 accepted as Rotundaria pustulosa (I. Lea, 1831) accepted as Cyclonaias pustulosa (I. Lea, 1831) accepted as Pustulosa pustulosa (I. Lea, 1831)
6. Subgenus Obliquaria (Rotundaria) Rafinesque, 1820 accepted as Obovaria Rafinesque, 1819
   1. Species Obliquaria (Rotundaria) pusilla Rafinesque, 1820 accepted as Reginaia ebenus (I. Lea, 1831)
   2. Species Obliquaria (Rotundaria) subrotunda Rafinesque, 1820 accepted as Obovaria subrotunda Rafinesque, 1820
   3. Species Obliquaria (Rotundaria) tuberculata Rafinesque, 1820 accepted as Cyclonaias tuberculata (Rafinesque, 1820) (basionym)
7. Subgenus Obliquaria (Scalenaria) Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
   1. Species Obliquaria (Scalenaria) obliquata Rafinesque, 1820 accepted as Epioblasma obliquata (Rafinesque, 1820)
   2. Species Obliquaria (Scalenaria) scalenia Rafinesque, 1820 accepted as Pleurobema clava (Lamarck, 1819)
   3. Species Obliquaria (Scalenaria) triangularis Rafinesque, 1820 accepted as Pleurobema sintoxia (Rafinesque, 1820)
8. Subgenus Obliquaria (Sintoxia) Rafinesque, 1820 accepted as Pleurobema Rafinesque, 1819
   1. Species Obliquaria (Sintoxia) calendis Rafinesque, 1831 accepted as Ortmanniana ligamentina (Lamarck, 1819)
   2. Species Obliquaria (Sintoxia) lateralis Rafinesque, 1820 accepted as Fusconaia flava (Rafinesque, 1820)
   3. Species Obliquaria (Sintoxia) sintoxia Rafinesque, 1820 accepted as Pleurobema sintoxia (Rafinesque, 1820)
9. Species Obliquaria bicolor Rafinesque, 1831 accepted as Eurynia dilatata (Rafinesque, 1820)
10. Species Obliquaria depressa Rafinesque, 1820 accepted as Ellipsaria lineolata (Rafinesque, 1820)
11. Species Obliquaria ellipsaria Rafinesque, 1820 accepted as Ellipsaria lineolata (Rafinesque, 1820)
12. Species Obliquaria lineolata Rafinesque, 1820 accepted as Ellipsaria lineolata (Rafinesque, 1820)
13. Species Obliquaria pallens Rafinesque, 1831 accepted as Ortmanniana ligamentina (Lamarck, 1819)
14. Species Obliquaria plateolus Rafinesque, 1831 accepted as Medionidus conradicus (I. Lea, 1834)
15. Species Obliquaria rubra Rafinesque, 1820 accepted as Pleurobema rubrum (Rafinesque, 1820) accepted as Pleurobema sintoxia (Rafinesque, 1820)
16. Species Obliquaria sintoxia Rafinesque, 1820 accepted as Pleurobema sintoxia (Rafinesque, 1820)
17. Species Obliquaria tuberculata Rafinesque, 1820 accepted as Cyclonaias tuberculata (Rafinesque, 1820) (original combination)
18. Species Obliquaria violacea Rafinesque, 1831 accepted as Eurynia dilatata (Rafinesque, 1820)

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