1. Species Borlasia alba Thompson, 1845 accepted as Amphiporus lactifloreus (Johnston, 1828) (synonym)
2. Species Borlasia alileuti Anadon, 1981 accepted as Cerebratulus marginatus [Renier], [1804] (synonym)
3. Species Borlasia angliae Oken, 1815 accepted as Lineus longissimus (Gunnerus, 1770) (unaccepted > junior subjective synonym)
4. Species Borlasia annellata accepted as Cerebratulus annellatus (Leuckart, 1849) (synonym)
5. Species Borlasia annulata (Ehrenberg, 1831) accepted as Notospermus geniculatus (Delle Chiaje, 1822) (synonym (partim))
6. Species Borlasia bilineata Schmarda, 1859 accepted as Baseodiscus bilineatus (Schmarda, 1859) (unaccepted > superseded combination)
7. Species Borlasia camillea Quatrefages, 1846 accepted as Emplectonema neesii (Örsted, 1843) (unaccepted > junior subjective synonym)
8. Species Borlasia carmellina Quatrefages, 1846 accepted as Baseodiscus delineatus (Delle Chiaje, 1822) (unaccepted > junior subjective synonym)
9. Species Borlasia cephalothrix Diesing, 1850 accepted as Cephalothrix linearis (Rathke, 1799) (unaccepted > unavailable name)
10. Species Borlasia echinoderma Marion, 1873 accepted as Emplectonema echinoderma (Marion, 1873) (synonym)
11. Species Borlasia elizabethae McIntosh, 1873-1874 accepted as Euborlasia elizabethae (McIntosh, 1873-1874) (New Combination)
12. Species Borlasia filiformis (Johnston, 1828) accepted as Procephalothrix filiformis (Johnston, 1828) accepted as Cephalothrix filiformis (Johnston, 1828) (unaccepted > superseded combination)
13. Species Borlasia flaccida sensu Johnston, 1846 accepted as Emplectonema neesii (Örsted, 1843) (synonym)
14. Species Borlasia gesserensis accepted as Lineus ruber (Müller, 1774) (synonym (partim))
15. Species Borlasia groenlandica (Örsted, 1843) accepted as Amphiporus groenlandicus Örsted, 1843 (unaccepted > superseded combination)
16. Species Borlasia hemprichii (Ehrenberg, 1831) accepted as Baseodiscus hemprichii (Ehrenberg, 1831) (unaccepted > superseded combination)
17. Species Borlasia hermaphroditica Keferstein, 1868 accepted as Tetrastemma hermaphroditica (Keferstein, 1868) (synonym)
18. Species Borlasia inmaculata Bürger, 1892 accepted as Euborlasia inmaculata (Bürger, 1892) (synonym)
19. Species Borlasia linearis (Rathke, 1799) accepted as Cephalothrix linearis (Rathke, 1799) (unaccepted > superseded combination)
20. Species Borlasia longa (Örsted, 1843) accepted as Cephalothrix linearis (Rathke, 1799) (unaccepted > superseded combination)
21. Species Borlasia longissimus accepted as Lineus longissimus (Gunnerus, 1770) (unaccepted > superseded combination)
22. Species Borlasia mandilla (Quatrefages, 1846) accepted as Amphiporus lactifloreus (Johnston, 1828) (unaccepted > junior subjective synonym)
23. Species Borlasia neesii (Örsted, 1843) accepted as Emplectonema neesii (Örsted, 1843) (Synonym)
24. Species Borlasia nigra Byerley, 1854 accepted as Lineus longissimus (Gunnerus, 1770) (unaccepted > junior subjective synonym)
25. Species Borlasia novae-zelandiae Quoy & Gaimard, 1833 accepted as Amphiporus novaezelandiae (Quoy & Gaimard, 1833) (synonym)
26. Species Borlasia quadripunctata Quoy & Gaimard, 1833 accepted as Nemertopsis quadripunctata (Quoy & Gaimard, 1833) (unaccepted > superseded combination)
27. Species Borlasia quinquelineata Quoy & Gaimard, 1833 accepted as Baseodiscus quinquelineatus (Quoy & Gaimard, 1833) (synonym)
28. Species Borlasia rufa Rathke, 1843 accepted as Lineus ruber (Müller, 1774) (synonym)
29. Species Borlasia rufifrons Johnston, 1837 accepted as Cephalothrix rufifrons (Johnston, 1837) (unaccepted > superseded combination)
30. Species Borlasia sanguinea (Girard, 1853) accepted as Amphiporus sanguineus Girard, 1853 (unaccepted > superseded combination)
31. Species Borlasia splendida Keferstein, 1862 accepted as Punnettia splendida (Keferstein, 1862) (unaccepted > superseded combination)
32. Species Borlasia striata Quoy & Gaimard, 1833 accepted as Baseodiscus delineatus (Delle Chiaje, 1822) (unaccepted > junior subjective synonym)
33. Species Borlasia tricuspidata Quoy & Gaimard, 1833 accepted as Notospermus tricuspidatus (Quoy & Gaimard, 1833) (synonym)
34. Species Borlasia trilineata Schmarda, 1859 accepted as Lineopsella trilineata (Schmarda, 1859) (synonym)
35. Species Borlasia viridis Quoy & Gaimard, 1833 accepted as Ophiocephalus viridis (Quoy & Gaimard, 1833) accepted as Notospermus tricuspidatus (Quoy & Gaimard, 1833) (Synonym)
36. Species Borlasia vittata Quoy & Gaimard, 1833 accepted as Lineus vittatus (Quoy & Gaimard, 1833) (synonym)
37. Species Borlasia vivipara Ulyanina, 1870 accepted as Prosorhochmus viviparus (Ulyanina, 1870) (synonym)
38. Species Borlasia caerulescens (Delle Chiaje, 1822) (uncertain > nomen dubium)
39. Species Borlasia dröbachensis (Örsted, 1845) (uncertain > nomen dubium)
40. Species Borlasia incompta Ehlers, 1871 (uncertain > nomen dubium)
41. Species Borlasia kurtzii Girard, 1853 (uncertain > taxon inquirendum)
42. Species Borlasia nigrofusca (Ehrenberg, 1831) (uncertain > nomen dubium)
43. Species Borlasia octoculata (uncertain > taxon inquirendum)
44. Species Borlasia viridis Grube, 1840 (uncertain > nomen dubium)

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