1. Species Pachydrilus americanus Ude, 1896 accepted as Lumbricillus americanus (Ude, 1896) (Synonym)
2. Species Pachydrilus argenteus (Michaelsen, 1899) accepted as Marionina argentea (Michaelsen, 1889) (unaccepted > superseded combination)
3. Species Pachydrilus armatus (Levinsen, 1884) accepted as Mesenchytraeus armatus (Levinsen, 1884) (unaccepted > superseded combination)
4. Species Pachydrilus beumeri Michaelsen, 1886 accepted as Mesenchytraeus beumeri (Michaelsen, 1886)
5. Species Pachydrilus catanensis (Drago, 1887) accepted as Lumbricillus catanensis (Drago, 1887)
6. Species Pachydrilus claparedeanus Ditlevsen, 1904 accepted as Lumbricillus lineatus (Müller, 1774) (Synonym)
7. Species Pachydrilus crassus Claparède, 1861 accepted as Lumbricillus crassus (Claparède, 1861) (Synonym)
8. Species Pachydrilus ebudensis Claparède, 1861 accepted as Lumbricillus ebudensis (Claparède, 1861) (Synonym)
9. Species Pachydrilus eiseni Černosvitov, 1937 accepted as Lumbricillus eiseni (Cernosvitov, 1937) (unaccepted > superseded combination)
10. Species Pachydrilus elgonensis Černosvitov, 1938 accepted as Marionina elgonensis (Černosvitov, 1938)
11. Species Pachydrilus enchytraeoides Saint-Loup, 1885 accepted as Lumbricillus enchytraeoides (Saint-Loup, 1885)
12. Species Pachydrilus enteromorphae (von Bülow, 1957) accepted as Lumbricillus enteromorphae von Bülow, 1957 (Synonym)
13. Species Pachydrilus fossarum Tauber, 1879 accepted as Lumbricillus fossarum (Tauber, 1879) (Synonym)
14. Species Pachydrilus georgianus Michaelsen, 1888 accepted as Marionina georgiana (Michaelsen, 1888) (superseded original combination)
15. Species Pachydrilus germanicus Michaelsen, 1886 accepted as Lumbricillus rivalis (Levinsen, 1884) (Synonym)
16. Species Pachydrilus glandulosus Michaelsen, 1888 accepted as Cognettia glandulosa (Michaelsen, 1888) (unaccepted > superseded combination)
17. Species Pachydrilus helgolandicus Michaelsen, 1934 accepted as Lumbricillus helgolandicus (Michaelsen, 1934) (Synonym)
18. Species Pachydrilus insularis Ude, 1896 accepted as Lumbricillus insularis (Ude, 1896)
19. Species Pachydrilus kamtschatkanus Michaelsen, 1929 accepted as Lumbricillus kamtschatkanus (Michaelsen, 1929)
20. Species Pachydrilus kinangopensis Černosvitov, 1938 accepted as Marionina kinangopensis (Černosvitov, 1938)
21. Species Pachydrilus lacteus Claparède, 1861 accepted as Lumbricillus lacteus (Claparède, 1861)
22. Species Pachydrilus limosus Diefenbach, 1886 accepted as Pachydrilus pagenstecheri (Ratzel, 1869) accepted as Lumbricillus pagenstecheri (Ratzel, 1869) (unaccepted > junior subjective synonym)
23. Species Pachydrilus lineatus (Müller, 1774) accepted as Lumbricillus lineatus (Müller, 1774) (Synonym)
24. Species Pachydrilus litoreus Hesse, 1893 accepted as Lumbricillus litoreus (Hesse, 1893)
25. Species Pachydrilus lobatus Bretscher, 1899 accepted as Marionina lobata (Bretscher, 1899)
26. Species Pachydrilus maculatus Bretscher, 1896 accepted as Marionina maculata (Bretscher, 1896) (superseded original combination)
27. Species Pachydrilus maritimus Ude, 1896 accepted as Lumbricillus maritimus (Ude, 1896)
28. Species Pachydrilus maximus Michaelsen, 1888 accepted as Lumbricillus maximus (Michaelsen, 1888)
29. Species Pachydrilus minimus Černosvitov, 1929 accepted as Lumbricillus minimus (Cernosvitov, 1929)
30. Species Pachydrilus minutus (Müller, 1776) accepted as Lumbricillus minutus (Müller, 1776)
31. Species Pachydrilus nervosus (Eisen, 1878) accepted as Lumbricillus nervosus (Eisen, 1878)
32. Species Pachydrilus nipponicus Yamaguchi, 1937 accepted as Lumbricillus nipponicus (Yamaguchi, 1937) (Synonym)
33. Species Pachydrilus orthochaetus Delphy, 1921 accepted as Lumbricillus viridis Stephenson, 1911 (synonym)
34. Species Pachydrilus pagenstecheri (Ratzel, 1869) accepted as Lumbricillus pagenstecheri (Ratzel, 1869) (Synonym)
35. Species Pachydrilus parvus Ude, 1896 accepted as Lumbricillus parvus (Ude, 1896) (Synonym)
36. Species Pachydrilus profugus (Eisen, 1878) accepted as Lumbricillus profugus (Eisen, 1878) (Synonym)
37. Species Pachydrilus pygmaeus Michaelsen, 1935 accepted as Lumbricillus pygmaeus (Michaelsen, 1935) (Synonym)
38. Species Pachydrilus riparius (Bretscher, 1899) accepted as Marionina riparia Bretscher, 1899 accepted as Globulidrilus riparius (Bretscher, 1899) (unaccepted > superseded combination)
39. Species Pachydrilus rivalis Levinsen, 1884 accepted as Lumbricillus rivalis (Levinsen, 1884) (Synonym)
40. Species Pachydrilus semifuscus Claparède, 1861 accepted as Claparedrilus semifuscus (Claparède, 1861) (superseded original combination)
41. Species Pachydrilus southerni Černosvitov, 1937 accepted as Marionina southerni (Černosvitov, 1937) (unaccepted > superseded combination)
42. Species Pachydrilus sphagnetorum Vejdovský, 1878 accepted as Chamaedrilus sphagnetorum (Vejdovský, 1878) accepted as Cognettia sphagnetorum (Veydovsky, 1878)
43. Species Pachydrilus subterraneus Vejdovský, 1889 accepted as Lumbricillus rivalis (Levinsen, 1884)
44. Species Pachydrilus tenuis Ude, 1896 accepted as Lumbricillus tenuis (Ude, 1896) (Synonym)
45. Species Pachydrilus verrucosus Claparède, 1861 accepted as Lumbricillus verrucosus (Claparède, 1861) (unaccepted > superseded combination)
46. Species Pachydrilus affinis Czerniavsky, 1881 (uncertain > taxon inquirendum)
47. Species Pachydrilus angulatus Bretscher, 1899 (uncertain > taxon inquirendum)
48. Species Pachydrilus charkowiensis Czerniavsky, 1881 (uncertain > taxon inquirendum)
49. Species Pachydrilus fossor Vejdovský, 1878 (uncertain > unassessed)
50. Species Pachydrilus gracilis Czerniavsky, 1881 (uncertain > taxon inquirendum)
51. Species Pachydrilus krohnii Claparède, 1869 (uncertain > taxon inquirendum)
52. Species Pachydrilus lacustris Czerniavsky, 1881 (uncertain > taxon inquirendum)
53. Species Pachydrilus opacus Czerniavsky, 1881 (uncertain > taxon inquirendum)
54. Species Pachydrilus proximus Czerniavsky, 1881 (uncertain > taxon inquirendum)
55. Species Pachydrilus similis Czerniavsky, 1881 (uncertain > taxon inquirendum)

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