1. Species Polia caeca Chapuis, 1886
2. Species Polia antonina (Quatrefages, 1846) accepted as Tetranemertes antonina (Quatrefages, 1846) (synonym)
3. Species Polia armata Quatrefages, 1846 accepted as Tetrastemma quatrefagesi (Bürger, 1904) (unaccepted > junior homonym)
4. Species Polia aurita Ulyanina, 1870 accepted as Ototyphlonemertes aurita (Ulyanina, 1870) (synonym)
5. Species Polia baculus Quatrefages, 1846 accepted as Tetrastemma baculus (Quatrefages, 1846) (unaccepted > superseded combination)
6. Species Polia bembix Quatrefages, 1846 accepted as Nipponnemertes pulchra (Johnston, 1837) (unaccepted > junior subjective synonym)
7. Species Polia berea Quatrefages, 1846 accepted as Amphiporus lactifloreus (Johnston, 1828) (unaccepted > junior subjective synonym)
8. Species Polia bilineata Delle Chaije, 1841 accepted as Lineus kennelii Bürger, 1892 (synonym)
9. Species Polia bivittata Delle Chiaje, 1841 accepted as Nemertopsis bivittata (Delle Chiaje, 1841) (synonym)
10. Species Polia canescens Leuckart, 1849 accepted as Amphiporus canescens (Leuckart, 1849) (synonym)
11. Species Polia capitata Beneden, 1861 accepted as Tetrastemma candidum (Müller, 1774) (synonym)
12. Species Polia coronata Quatrefages, 1846 accepted as Tetrastemma coronatum (Quatrefages, 1846) (unaccepted > superseded combination)
13. Species Polia crucigera Delle Chaije, 1844 accepted as Tubulanus annulatus (Montagu, 1804) (synonym)
14. Species Polia curta Hubrecht, 1879 accepted as Baseodiscus delineatus (Delle Chiaje, 1822) (synonym)
15. Species Polia delineata Delle Chiaje, 1822 accepted as Baseodiscus delineatus (Delle Chiaje, 1822) (unaccepted > superseded combination)
16. Species Polia farinosa van Beneden, 1861 accepted as Oerstedia dorsalis (Abildgaard, 1806) (unaccepted > superseded combination)
17. Species Polia filum Quatrefages, 1846 accepted as Cephalothrix rufifrons (Johnston, 1837) (unaccepted > junior subjective synonym)
18. Species Polia fumosa Quarterages, 1846 accepted as Prosorhochmus claparedii Keferstein, 1862 (unaccepted > junior subjective synonym)
19. Species Polia geniculata Delle Chiaje, 1822 accepted as Lineus geniculatus (Delle Chiaje, 1822) accepted as Notospermus geniculatus (Delle Chiaje, 1822) (synonym)
20. Species Polia glauca Quatrefages, 1846 accepted as Amphiporus lactifloreus (Johnston, 1828) (unaccepted > junior subjective synonym)
21. Species Polia gracilis Girard, 1851 accepted as Lineus ruber (Müller, 1774) (synonym)
22. Species Polia grisea Stimpson, 1855 accepted as Amphiporus griseus (Stimpson, 1855) (synonym)
23. Species Polia humilis Quatrefages, 1846 accepted as Tetrastemma humilis (Quatrefages, 1846) accepted as Tetrastemma humile (Quatrefages, 1846) (unaccepted > superseded combination)
24. Species Polia involuta van Beneden, 1861 accepted as Carcinonemertes carcinophila (Kölliker, 1845) (unaccepted > junior subjective synonym)
25. Species Polia mandilla Quatrefages, 1846 accepted as Amphiporus lactifloreus (Johnston, 1828) (unaccepted > junior subjective synonym)
26. Species Polia minor Hubrecht, 1879 accepted as Baseodiscus minor (Hubrecht, 1879) (synonym)
27. Species Polia mutabilis Quatrefages, 1846 accepted as Amphiporus lactifloreus (Johnston, 1828) (unaccepted > junior subjective synonym)
28. Species Polia opaca Quatrefages, 1846 accepted as Lineus ruber (Müller, 1774) (unaccepted > junior subjective synonym)
29. Species Polia pulchella Quatrefages, 1846 accepted as Tetrastemma melanocephalum (Johnston, 1837) (unaccepted > junior subjective synonym)
30. Species Polia pusilla Delle Chaije, 1841 accepted as Amphiporus lactifloreus (Johnston, 1828) (synonym)
31. Species Polia rhomboidalis Stimpson, 1855 accepted as Amphiporus rhomboidalis (Stimpson, 1855) (synonym)
32. Species Polia rosea Delle Chiaje, 1841 accepted as Cerebratulus roseus (Delle Chiaje, 1841) (basionym)
33. Species Polia sanguirubra Quatrefages, 1846 accepted as Tetrastemma flavidum Ehrenberg, 1828 (unaccepted > junior subjective synonym)
34. Species Polia siphunculus Delle Chiaje, 1825 accepted as Cerebratulus marginatus [Renier], [1804] (synonym)
35. Species Polia tetrophthalma Delle Chaije, 1841 accepted as Tetrastemma flavidum Ehrenberg, 1828 (synonym)
36. Species Polia vermiculus Quatrefages, 1846 accepted as Tetrastemma vermiculus (Quatrefages, 1846) (synonym)
37. Species Polia violacea Quatrefages, 1846 accepted as Amphiporus lactifloreus (Johnston, 1828) (unaccepted > junior subjective synonym)
38. Species Polia xanthopila Giard, 1888 accepted as Carcinonemertes carcinophila (Kölliker, 1845) (synonym)
39. Species Polia caerulescens Delle Chaije, 1822 (uncertain > nomen dubium)
40. Species Polia coerulea Delle Chaije, 1828 accepted as Polia caerulescens Delle Chaije, 1822 (uncertain > nomen dubium, synonym)
41. Species Polia oculata Delle Chiaje, 1828 (uncertain > nomen dubium)
42. Species Polia purpurea Quatrefages, 1846 (uncertain > nomen dubium)

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