1. Species Tethys elegans W. H. Turton, 1932 (uncertain > taxon inquirendum)
2. Species Tethys modesta Thiele, 1910 (uncertain > taxon inquirendum)
3. Subgenus Tethys (Aplysia) Linnaeus, 1767 accepted as Aplysia Linnaeus, 1767
   1. Species Tethys (Aplysia) tarda A. E. Verrill, 1901 accepted as Aplysia tarda (A. E. Verrill, 1901) (unaccepted > superseded combination)
   2. Species Tethys (Aplysia) willcoxi (Heilprin, 1887) accepted as Aplysia fasciata Poiret, 1789 (unaccepted > junior subjective synonym)
   3. Species Tethys (Aplysia) morio A. E. Verrill, 1901 represented as Aplysia morio (A. E. Verrill, 1901)
4. Subgenus Tethys (Neaplysia) J. G. Cooper, 1863 accepted as Aplysia Linnaeus, 1767 (unaccepted combination)
   1. Species Tethys (Neaplysia) californica (J. G. Cooper, 1863) accepted as Aplysia californica J. G. Cooper, 1863 (unaccepted > superseded combination)
   2. Species Tethys (Neaplysia) ritteri T. D. A. Cockerell, 1901 accepted as Aplysia californica J. G. Cooper, 1863 (unaccepted > junior subjective synonym)
5. Subgenus Tethys (Phycophila) A. Adams, 1861 accepted as Phycophila A. Adams, 1861 (unaccepted > superseded rank)
   1. Species Tethys (Phycophila) adamsi Pilsbry, 1896 (uncertain > taxon inquirendum)
6. Species Tethys californicus (J. G. Cooper, 1863) accepted as Aplysia californica J. G. Cooper, 1863 (unaccepted > superseded combination)
7. Species Tethys capensis O'Donoghue, 1929 accepted as Aplysia juliana Quoy & Gaimard, 1832 (unaccepted > junior subjective synonym)
8. Species Tethys cervina Dall & C. T. Simpson, 1901 accepted as Aplysia cervina (Dall & C. T. Simpson, 1901) (unaccepted > superseded combination)
9. Species Tethys extraordinaria J. K. Allan, 1932 accepted as Aplysia extraordinaria (J. K. Allan, 1932) (unaccepted > superseded combination)
10. Species Tethys floridensis Pilsbry, 1895 accepted as Aplysia fasciata Poiret, 1789
11. Species Tethys hirasei Baba, 1936 accepted as Aplysia oculifera A. Adams & Reeve, 1850
12. Species Tethys kurodai Baba, 1937 accepted as Aplysia kurodai (Baba, 1937) (unaccepted > superseded combination)
13. Species Tethys leporina Linnaeus, 1758 sensu Pilsbry, 1895 accepted as Aplysia fasciata Poiret, 1789 (unaccepted > unavailable name, rejected under the provisions of ICZN Opinion 200)
14. Species Tethys leporina Linnaeus, 1758 (unaccepted > unavailable name, nomen dubium; ICZN opinion 200: suppressed under the plenary powers for the purposes of the principle of Priority only)
15. Species Tethys limacina Linnaeus, 1758 (unaccepted > unavailable name, ICZN opinion 200: suppressed under the plenary powers for the purposes of the principle of Priority only)
16. Species Tethys maculata (Rang, 1828) accepted as Aplysia maculata Rang, 1828 (unaccepted > superseded combination)
17. Species Tethys operta Burne, 1906 accepted as Aplysia argus Rüppell & Leuckart, 1830 (unaccepted > junior subjective synonym)
18. Species Tethys panamensis Pilsbry, 1895 accepted as Aplysia dactylomela Rang, 1828
19. Species Tethys parvula (Mörch, 1863) accepted as Aplysia parvula Mörch, 1863 (unaccepted > superseded combination)
20. Species Tethys peasei Tryon, 1895 accepted as Aplysia peasei (Tryon, 1895)
21. Species Tethys pilsbryi Letson, 1898 accepted as Aplysia pilsbryi (Letson, 1898)
22. Species Tethys pulmonica (A. A. Gould, 1852) accepted as Aplysia pulmonica A. A. Gould, 1852
23. Species Tethys robertsi Pilsbry, 1895 accepted as Aplysia californica J. G. Cooper, 1863 (unaccepted > junior subjective synonym)
24. Species Tethys willcoxi (Heilprin, 1887) accepted as Aplysia fasciata Poiret, 1789 (unaccepted > junior subjective synonym)

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