1. Species Tethyum arenicolum (Verrill, 1872) accepted as Cnemidocarpa mollis (Stimpson, 1852) (new combination)
2. Species Tethyum areolatum (Heller, 1878) accepted as Cnemidocarpa areolata (Heller, 1878) (new combination)
3. Species Tethyum asymmetron Hartmeyer, 1912 accepted as Asterocarpa humilis (Heller, 1878) (original combination)
4. Species Tethyum atlanticum Van Name, 1912 accepted as Styela atlantica (Van Name, 1912) accepted as Styela sigma Hartmeyer, 1912 (original combination)
5. Species Tethyum aurantium (Pallas, 1787) accepted as Halocynthia aurantium (Pallas, 1787) (new combination)
6. Species Tethyum bathybium (Bonnevie, 1896) accepted as Styela bathybia Bonnevie, 1896 (new combination)
7. Species Tethyum canopus (Savigny, 1816) accepted as Styela canopus (Savigny, 1816) (new combination)
8. Species Tethyum clava (Herdman, 1881) accepted as Styela clava Herdman, 1881 (new combination)
9. Species Tethyum clavatum (Pallas, 1774) accepted as Styela clavata (Pallas, 1774) (new combination)
10. Species Tethyum compressum Redikorzev, 1910 accepted as Styela coriacea (Alder & Hancock, 1848) (original combination)
11. Species Tethyum coriaceum Bohadsch, 1761 accepted as Halocynthia papillosa (Linnaeus, 1767) (original combination, suppressed)
12. Species Tethyum costatum Hartmeyer, 1911 accepted as Styela angularis (Stimpson, 1855) (original combination)
13. Species Tethyum curtzei (Michaelsen, 1900) accepted as Cnemidocarpa nordenskjöldi (Michaelsen, 1898) (new combination)
14. Species Tethyum cylindriforme (Bonnevie, 1896) accepted as Styela coriacea (Alder & Hancock, 1848) (new combination)
15. Species Tethyum doliolum (Bjerkan, 1905) accepted as Styela gelatinosa (Traustedt, 1886) (new combination)
16. Species Tethyum drygalskii Hartmeyer, 1911 accepted as Cnemidocarpa drygalskii (Hartmeyer, 1911) (original combination)
17. Species Tethyum elsa (Hartmeyer, 1906) accepted as Cnemidocarpa finmarkiensis (Kiaer, 1893) (new combination)
18. Species Tethyum fibrosum (Stimpson, 1852) accepted as Polycarpa fibrosa (Stimpson, 1852) (new combination)
19. Species Tethyum finmarckiense (Kiaer, 1893) accepted as Cnemidocarpa finmarkiensis (Kiaer, 1893) (synonym)
20. Species Tethyum finmarkiense (Kiaer, 1893) accepted as Cnemidocarpa finmarkiensis (Kiaer, 1893) (new combination)
21. Species Tethyum flavum (Herdman, 1881) accepted as Styela squamosa Herdman, 1881 (original combination)
22. Species Tethyum gelatinosum (Traustedt, 1886) accepted as Styela gelatinosa (Traustedt, 1886) (new combination)
23. Species Tethyum gibbsii (Stimpson, 1864) accepted as Styela gibbsii Stimpson, 1864 (new combination)
24. Species Tethyum gibsii (Stimpson, 1864) accepted as Styela gibbsii Stimpson, 1864 (literature misspelling)
25. Species Tethyum glans (Herdman, 1881) accepted as Styela glans Herdman, 1881 (new combination)
26. Species Tethyum godeffroyi Michaelsen, 1912 accepted as Cnemidocarpa personata (Herdman, 1899) (original combination)
27. Species Tethyum grahami (Sluiter, 1905) accepted as Styela grahami Sluiter, 1905 accepted as Dicarpa insinuosa (Sluiter, 1912) (new combination)
28. Species Tethyum igaboja (Oka, 1906) accepted as Halocynthia igaboja Oka, 1906 (new combination)
29. Species Tethyum insinuosum Sluiter, 1912 accepted as Dicarpa insinuosa (Sluiter, 1912) (original combination)
30. Species Tethyum jacatrensis (Sluiter, 1890) accepted as Pyura arenosa (Herdman, 1881) (new combination)
31. Species Tethyum joannae (Herdman, 1898) accepted as Cnemidocarpa clara (Hartmeyer, 1906) (new combination)
32. Species Tethyum lacteum (Herdman, 1881) accepted as Cnemidocarpa verrucosa (Lesson, 1830) (new combination)
33. Species Tethyum loveni (Sars, 1851) accepted as Styela coriacea (Alder & Hancock, 1848) (new combination)
34. Species Tethyum maeandrium (Sluiter, 1904) accepted as Styela maendria Sluiter, 1904 accepted as Styela maeandria Sluiter, 1904 (new combination)
35. Species Tethyum magalhaensis (Michaelsen, 1898) accepted as Styela magalhaensis Michaelsen, 1898 (new combination)
36. Species Tethyum microspinosum Van Name, 1921 accepted as Halocynthia microspinosa (Van Name, 1921) (original combination)
37. Species Tethyum milleri (Ritter, 1907) accepted as Styela squamosa Herdman, 1881 (new combination)
38. Species Tethyum molle (Stimpson, 1852) accepted as Cnemidocarpa mollis (Stimpson, 1852) (new combination)
39. Species Tethyum mollis (Stimpson, 1852) accepted as Cnemidocarpa mollis (Stimpson, 1852) (synonym)
40. Species Tethyum montereyense (Dall, 1872) accepted as Styela montereyensis (Dall, 1872) (new combination)
41. Species Tethyum montereyensis (Dall, 1872) accepted as Styela montereyensis (Dall, 1872) (synonym)
42. Species Tethyum mortenseni Hartmeyer, 1912 accepted as Cnemidocarpa mortenseni (Hartmeyer, 1912) (original combination)
43. Species Tethyum natale (Hartmeyer, 1905) accepted as Styela natalis Hartmeyer, 1905 (new combination)
44. Species Tethyum nisiotis (Sluiter, 1900) accepted as Cnemidocarpa nisiotis (Sluiter, 1900) (new combination)
45. Species Tethyum nodiferum Ostroumov & Pavlenko, 1911 accepted as Styela coriacea (Alder & Hancock, 1848) (original combination)
46. Species Tethyum nordenskjoeldi (Michaelsen, 1898) accepted as Styela nordenskjöldi Michaelsen, 1898 accepted as Cnemidocarpa nordenskjöldi (Michaelsen, 1898) (synonym)
47. Species Tethyum nordenskjoldi (Michaelsen, 1898) accepted as Cnemidocarpa nordenskjöldi (Michaelsen, 1898) (new combination)
48. Species Tethyum oblongum (Herdman, 1881) accepted as Styela squamosa Herdman, 1881 (new combination)
49. Species Tethyum ohlini (Michaelsen, 1898) accepted as Cnemidocarpa ohlini (Michaelsen, 1898) (new combination)
50. Species Tethyum orbiculare (Sluiter, 1904) accepted as Styela canopus (Savigny, 1816) (new combination)
51. Species Tethyum paessleri (Michaelsen, 1898) accepted as Styela paessleri (Michaelsen, 1898) (new combination)
52. Species Tethyum papillosum Gunnerus, 1765 accepted as Halocynthia papillosa (Linnaeus, 1767) (original combination)
53. Species Tethyum partitum (Stimpson, 1852) accepted as Styela canopus (Savigny, 1816) (new combination)
54. Species Tethyum plicata (Lesueur, 1823) accepted as Styela plicata (Lesueur, 1823) (synonym)
55. Species Tethyum plicatum (Lesueur, 1823) accepted as Styela plicata (Lesueur, 1823) (new combination)
56. Species Tethyum pupa (Heller, 1878) accepted as Styela canopus (Savigny, 1816) (new combination)
57. Species Tethyum pyriforme (Rathke, 1806) accepted as Halocynthia pyriformis (Rathke, 1806) (misspelling)
58. Species Tethyum pyriformis (Rathke, 1806) accepted as Halocynthia pyriformis (Rathke, 1806) (synonym)
59. Species Tethyum quidni Sluiter, 1912 accepted as Styela wandeli (Sluiter, 1911) (original combination)
60. Species Tethyum rhizopus (Redikorzev, 1907) accepted as Cnemidocarpa rhizopus (Redikorzev, 1907) (new combination)
61. Species Tethyum roretzi (Drasche, 1884) accepted as Halocynthia roretzi (Drasche, 1884) (new combination)
62. Species Tethyum rusticum (Linnaeus, 1767) accepted as Styela rustica Linnaeus, 1767 (new combination)
63. Species Tethyum serpentina Sluiter, 1912 accepted as Styela serpentina (Sluiter, 1912) accepted as Cnemidocarpa pfefferi (Michaelsen, 1898) (misspelling)
64. Species Tethyum serpentinum Sluiter, 1912 accepted as Styela serpentina (Sluiter, 1912) accepted as Cnemidocarpa pfefferi (Michaelsen, 1898) (original combination)
65. Species Tethyum sociabile Gunnerus, 1765 accepted as Ciona intestinalis (Linnaeus, 1767) (original combination)
66. Species Tethyum spectabile (Herdman, 1910) accepted as Cnemidocarpa verrucosa (Lesson, 1830) (new combination)
67. Species Tethyum spiriferum (Herdman, 1899) accepted as Cnemidocarpa verrucosa (Lesson, 1830) (new combination)
68. Species Tethyum steineni (Michaelsen, 1898) accepted as Cnemidocarpa verrucosa (Lesson, 1830) (new combination)
69. Species Tethyum stimpsoni (Ritter, 1900) accepted as Cnemidocarpa finmarkiensis (Kiaer, 1893) (new combination)
70. Species Tethyum tholiforme Sluiter, 1912 accepted as Styela squamosa Herdman, 1881 (original combination)
71. Species Tethyum tholiformis Sluiter, 1912 accepted as Styela squamosa Herdman, 1881 (literature misspelling)
72. Species Tethyum truncata (Ritter, 1901) accepted as Styela truncata Ritter, 1901 (synonym)
73. Species Tethyum truncatum (Ritter, 1901) accepted as Styela truncata Ritter, 1901 (new combination)
74. Species Tethyum verrucosa accepted as Cnemidocarpa verrucosa (Lesson, 1830) (synonym)
75. Species Tethyum verrucosum (Lesson, 1830) accepted as Cnemidocarpa verrucosa (Lesson, 1830) (new combination)
76. Species Tethyum vollbarthi Michaelsen, 1912 accepted as Styela vollbarthi (Michaelsen, 1912) (new combination)
77. Species Tethyum wandeli Sluiter, 1911 accepted as Styela wandeli (Sluiter, 1911) (original combination)
78. Species Tethyum whiteleggei (Herdman, 1899) accepted as Cnemidocarpa pedata (Herdman, 1881) (literature misspelling)
79. Species Tethyum whiteleggii (Herdman, 1899) accepted as Cnemidocarpa pedata (Herdman, 1881) (new combination)
80. Species Tethyum yakutatense (Ritter, 1901) accepted as Styela yakutatensis Ritter, 1901 (new combination)
81. Species Tethyum yakutatensis accepted as Styela yakutatensis Ritter, 1901 (synonym)
82. Species Tethyum australiense Michaelsen, 1912 (uncertain > nomen dubium)

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