1. Species Portlandia aestuariorum (Mosevich, 1928)
2. Species Portlandia arctica (Gray, 1824)
3. Species Portlandia arcuata (Pronina, 1969) †
4. Species Portlandia carolimartini Beets, 1984 †
5. Species Portlandia glacialis (J. E. Gray, 1825)
6. Species Portlandia isonota (E. von Martens, 1881)
7. Species Portlandia mendax (Meneghini, 1871) †
8. Species Portlandia sulcifera (Reeve, 1855)
9. Subgenus Portlandia (Hataiyoldia) Kamada, 1962 † accepted as Megayoldia (Hataiyoldia) Kamada, 1962 † (unaccepted > superseded rank)
   1. Species Portlandia (Hataiyoldia) tokunagai (Yokoyama, 1925) † accepted as Megayoldia tokunagai (Yokoyama, 1925) † (unaccepted > superseded combination)
10. Subgenus Portlandia (Megayoldia) A. E. Verrill & K. J. Bush, 1897 accepted as Megayoldia A. E. Verrill & K. J. Bush, 1897 (unaccepted > superseded rank)
    1. Species Portlandia (Megayoldia) gratiosa (Yokoyama, 1923) † (uncertain > unassessed)
11. Subgenus Portlandia (Taiwannuculana) Okutani & Lan, 1999 accepted as Taiwannuculana Okutani & Lan, 1999
    1. Species Portlandia (Taiwannuculana) exotica Okutani & Lan, 1999 accepted as Taiwannuculana exotica (Okutani & Lan, 1999) (unaccepted > superseded combination)
12. Subgenus Portlandia (Yoldiella) A. E. Verrill & K. J. Bush, 1897 accepted as Yoldiella A. E. Verrill & K. J. Bush, 1897
    1. Species Portlandia (Yoldiella) annenkovae Gorbunov, 1946 accepted as Yoldiella annenkovae (Gorbunov, 1946)
    2. Species Portlandia (Yoldiella) intermedia (M. Sars, 1865) accepted as Yoldiella intermedia (M. Sars, 1865)
    3. Species Portlandia (Yoldiella) subcircularis Odhner, 1960 accepted as Yoldiella subcircularis (Odhner, 1960)
13. Species Portlandia abyssicola Knudsen, 1970 accepted as Yoldiella abyssicola (Knudsen, 1970)
14. Species Portlandia annenkovae Gorbunov, 1946 accepted as Yoldiella annenkovae (Gorbunov, 1946)
15. Species Portlandia atkinsoni R. M. Johnston, 1880 † accepted as Pronucula atkinsoni (R. M. Johnston, 1880) † (unaccepted > superseded combination)
16. Species Portlandia dalli A. Krause, 1885 accepted as Megayoldia thraciaeformis (Storer, 1838)
17. Species Portlandia dubia Naumov & Fedyakov, 1994 accepted as Portlandia arctica (Gray, 1824)
18. Species Portlandia exotica Okutani & Lan, 1999 accepted as Taiwannuculana exotica (Okutani & Lan, 1999) (unaccepted > superseded combination)
19. Species Portlandia fora J. A. Allen, H. L. Sanders & F. J. Hannah, 1995 accepted as Yoldiella fora (J. A. Allen, H. L. Sanders & F. Hannah, 1995)
20. Species Portlandia fraterna (A. E. Verrill & K. J. Bush, 1898) accepted as Yoldiella nana (M. Sars, 1865) (unaccepted > junior subjective synonym)
21. Species Portlandia frigida (Torell, 1859) accepted as Yoldiella frigida (Torell, 1859)
22. Species Portlandia intermedia (M. Sars, 1865) accepted as Yoldiella intermedia (M. Sars, 1865)
23. Species Portlandia japonica (A. Adams & Reeve, 1850) accepted as Megayoldia japonica (A. Adams & Reeve, 1850)
24. Species Portlandia jeffreysi (Hidalgo, 1877) accepted as Yoldiella jeffreysi (Hidalgo, 1877)
25. Species Portlandia kolthoffi Hägg, 1904 accepted as Katadesmia kolthoffi (Hägg, 1904)
26. Species Portlandia lenticula (Møller, 1842) accepted as Yoldiella lenticula (Møller, 1842) (synonym)
27. Species Portlandia lepidula (A. Adams, 1856) accepted as Orthoyoldia lepidula (A. Adams, 1856)
28. Species Portlandia lischkei (E. A. Smith, 1885) accepted as Megayoldia lischkei (E. A. Smith, 1885)
29. Species Portlandia minuta J. A. Allen, H. L. Sanders & F. J. Hannah, 1995 accepted as Yoldiella minuta (J. A. Allen, H. L. Sanders & F. Hannah, 1995)
30. Species Portlandia nigromaculata Okutani, 1983 accepted as Taiwannuculana nigromaculata (Okutani, 1983)
31. Species Portlandia pachia (A. E. Verrill & K. J. Bush, 1898) accepted as Yoldiella pachia A. E. Verrill & K. J. Bush, 1898
32. Species Portlandia parceplicata (Barnard, 1964) accepted as Scissileda parceplicata (Barnard, 1964)
33. Species Portlandia persei Messjatsev, 1931 accepted as Yoldiella propinqua (Leche, 1878)
34. Species Portlandia philippiana (Nyst, 1845) accepted as Yoldiella philippiana (Nyst, 1845)
35. Species Portlandia pygmaea (Münster, 1837) accepted as Yoldiella pygmaea (Münster, 1837) † (unaccepted > superseded combination)
36. Species Portlandia subaequilatera (Jeffreys, 1879) accepted as Yoldiella lucida (Lovén, 1846)
37. Species Portlandia subaequilatera (Jeffreys, 1879) sensu Ockelmann, 1959 accepted as Yoldiella propinqua (Leche, 1878) (misapplication)
38. Species Portlandia subangulata (A. E. Verrill & K. J. Bush, 1898) accepted as Yoldiella lucida (Lovén, 1846) (unaccepted > junior subjective synonym)
39. Species Portlandia subcircularis Odhner, 1960 accepted as Yoldiella subcircularis (Odhner, 1960)
40. Subgenus Portlandia (Dyolia) La Perna & Ragaini, 2008 represented as Portlandia Mörch, 1857
    1. Species Portlandia (Dyolia) mendax (Meneghini, 1871) † represented as Portlandia mendax (Meneghini, 1871) †
41. Subgenus Portlandia (Portlandia) Mörch, 1857 represented as Portlandia Mörch, 1857
    1. Species Portlandia (Portlandia) impressa Perri, 1975 † accepted as Portlandia mendax (Meneghini, 1871) † (unaccepted > junior subjective synonym)
    2. Species Portlandia (Portlandia) arcuata (Pronina, 1969) † represented as Portlandia arcuata (Pronina, 1969) †
    3. Species Portlandia (Portlandia) parceplicata (Barnard, 1964) represented as Portlandia parceplicata (Barnard, 1964) accepted as Scissileda parceplicata (Barnard, 1964)
42. Species Portlandia siliqua (A. Adams, 1856) (uncertain > taxon inquirendum)

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