1. Species Pionosyllis compacta Malmgren, 1867
2. Species Pionosyllis gigantea Moore, 1908
3. Species Pionosyllis heterochaetosa San Martín & Hutchings, 2006
4. Species Pionosyllis kerguelensis (McIntosh, 1885)
5. Species Pionosyllis koolalya San Martín & Hutchings, 2006
6. Species Pionosyllis longisetosa (Hartmann-Schröder, 1990)
7. Species Pionosyllis magnifica Moore, 1906
8. Species Pionosyllis malmgreni McIntosh, 1869
9. Species Pionosyllis manca Treadwell, 1931
10. Species Pionosyllis nidrosiensis (Bidenkap, 1907)
11. Species Pionosyllis petalecirrus Averincev, 1982
12. Species Pionosyllis stylifera Ehlers, 1912
13. Species Pionosyllis aciculata San Martín, 1990 accepted as Synmerosyllis aciculata (San Martín, 1990) (superseded original combination)
14. Species Pionosyllis aciculigrossa San Martín, 1990 accepted as Syllis aciculigrossa (San Martín, 1990) (superseded original combination)
15. Species Pionosyllis alternosetosa (Saint Joseph, 1886) accepted as Syllis armillaris (O.F. Müller, 1776)
16. Species Pionosyllis ancori San Martín & Hutchings, 2006 accepted as Brevicirrosyllis ancori (San Martín & Hutchings, 2006) (superseded original combination)
17. Species Pionosyllis anophthalma Capaccioni & San Martín, 1990 accepted as Perkinsyllis anophthalma (Capaccioni & San Martín, 1990) (superseded original combination)
18. Species Pionosyllis anops Hartman, 1953 accepted as Eusyllis maxima (Monro, 1930) (subjective synonym)
19. Species Pionosyllis articulata Kudenov & Harris, 1995 accepted as Paraehlersia articulata (Kudenov & Harris, 1995) (superseded original combination)
20. Species Pionosyllis augeneri Hartmann-Schröder, 1979 accepted as Perkinsyllis augeneri (Hartmann-Schröder, 1979) (superseded original combination)
21. Species Pionosyllis comosa Gravier, 1906 accepted as Pionosyllis kerguelensis (McIntosh, 1885) (unaccepted > junior subjective synonym, subjective synonym)
22. Species Pionosyllis confusa Hartmann-Schröder, 1960 accepted as Nudisyllis pulligera (Krohn, 1852) (subjective synonym)
23. Species Pionosyllis corallicola Ding & Westheide, 1997 accepted as Westheidesyllis corallicola (Ding & Westheide, 1997) (superseded original combination)
24. Species Pionosyllis decorus Annenkova, 1934 accepted as Typosyllis adamanteus (Treadwell, 1914) accepted as Syllis adamantea (Treadwell, 1914) (subjective synonym)
25. Species Pionosyllis dionisi Núñez & San Martín, 1991 accepted as Paraehlersia dionisi (Núñez & San Martín, 1991) (superseded original combination)
26. Species Pionosyllis divaricata (Keferstein, 1862) accepted as Nudisyllis divaricata (Keferstein, 1862) (superseded recombination)
27. Species Pionosyllis ehlersiaeformis Augener, 1913 accepted as Paraehlersia ehlersiaeformis (Augener, 1913) (superseded original combination)
28. Species Pionosyllis elegans Pierantoni, 1903 accepted as Parapionosyllis elegans (Pierantoni, 1903)
29. Species Pionosyllis elephantensis Hartmann-Schröder & Rosenfeldt, 1992 accepted as Pionosyllis dionisi Núñez & San Martín, 1991 accepted as Paraehlersia dionisi (Núñez & San Martín, 1991) (subjective synonym)
30. Species Pionosyllis elongata Johnson, 1901 accepted as Syllis elongata (Johnson, 1901) (superseded original combination)
31. Species Pionosyllis enigmatica (Wesenberg Lund, 1950) accepted as Pionosyllis nidrosiensis (Bidenkap, 1907) (subjective synonym; recombination)
32. Species Pionosyllis epipharynx Hartman, 1953 accepted as Eusyllis maxima (Monro, 1930) (subjective synonym)
33. Species Pionosyllis fusigera Augener, 1913 accepted as Paraopisthosyllis fusigera (Augener, 1913) (superseded original combination)
34. Species Pionosyllis gesae Perkins, 1981 accepted as Westheidesyllis gesae (Perkins, 1981) (superseded original combination)
35. Species Pionosyllis gestans Pierantoni, 1903 accepted as Parapionosyllis gestans (Pierantoni, 1903)
36. Species Pionosyllis gorringensis Hartmann-Schröder, 1977 accepted as Brevicirrosyllis gorringensis (Hartmann-Schröder, 1977) (superseded original combination)
37. Species Pionosyllis hartmannschroederae San Martín & Hutchings, 2006 accepted as Perkinsyllis hartmannschroederae (San Martín & Hutchings, 2006) (superseded original combination of replacement name)
38. Species Pionosyllis heterocirrata (Hartmann-Schröder, 1959) accepted as Westheidesyllis heterocirrata (Hartmann-Schröder, 1959) (unaccepted > superseded combination, superseded subsequent combination)
39. Species Pionosyllis homocirrata (Hartmann-Schröder, 1959) accepted as Perkinsyllis homocirrata (Hartmann-Schröder, 1958) (superseded recombination)
40. Species Pionosyllis hyalina (Grube, 1863) accepted as Syllis hyalina Grube, 1863
41. Species Pionosyllis kalimna San Martín & Hutchings, 2006 accepted as Paraopisthosyllis kalimna (San Martín & Hutchings, 2006) (superseded original combination)
42. Species Pionosyllis lamelligera Saint Joseph, 1887 accepted as Synmerosyllis lamelligera (Saint-Joseph, 1887) (superseded original combination)
43. Species Pionosyllis longisetosa Hartmann-Schröder, 1965 accepted as Perkinsyllis longisetosa (Hartmann-Schröder, 1965) (superseded original combination)
44. Species Pionosyllis longocirrata Saint-Joseph, 1887 accepted as Opisthodonta longocirrata (Saint-Joseph, 1887) (superseded original combination)
45. Species Pionosyllis luquei San Martín, 1990 accepted as Opisthodonta luquei (San Martín, 1990) (superseded original combination)
46. Species Pionosyllis magnidens Day, 1953 accepted as Nudisyllis magnidens (Day, 1953) (superseded original combination)
47. Species Pionosyllis mariae San Martín & Hutchings, 2006 accepted as Brevicirrosyllis mariae (San Martín & Hutchings, 2006) (superseded original combination)
48. Species Pionosyllis marquesensis Monro, 1939 accepted as Megasyllis marquesensis (Monro, 1939) (superseded original combination)
49. Species Pionosyllis maxima Monro, 1930 accepted as Eusyllis maxima (Monro, 1930) (superseded original combination)
50. Species Pionosyllis mayteae San Martín & Hutchings, 2006 accepted as Brevicirrosyllis mayteae (San Martín & Hutchings, 2006) (superseded original combination)
51. Species Pionosyllis melaenonephra Haswell, 1920 accepted as Opisthodonta melaenonephra (Haswell, 1920) (superseded original combination)
52. Species Pionosyllis micropharyngea Hartmann-Schröder, 1974 accepted as Megasyllis procera (Hartman, 1965) (subjective synonym)
53. Species Pionosyllis minuta Pierantoni, 1903 accepted as Parapionosyllis minuta (Pierantoni, 1903)
54. Species Pionosyllis morenoae San Martín, 1984 accepted as Pionosyllis longocirrata Saint-Joseph, 1887 accepted as Opisthodonta longocirrata (Saint-Joseph, 1887)
55. Species Pionosyllis neapolitana Goodrich, 1930 accepted as Salvatoria neapolitana (Goodrich, 1930)
56. Species Pionosyllis nutrix Monro, 1936 accepted as Salvatoria nutrix (Monro, 1936) (superseded original combination)
57. Species Pionosyllis oculata Hartmann-Schröder, 1960 accepted as Brania arminii (Langerhans, 1881) (subjective synonym)
58. Species Pionosyllis papillosa Pierantoni, 1903 accepted as Parapionosyllis papillosa (Pierantoni, 1903)
59. Species Pionosyllis pierantoni Cognetti, 1957 accepted as Pionosyllis weismanni Langerhans, 1879 accepted as Brevicirrosyllis weismanni (Langerhans, 1879)
60. Species Pionosyllis pierantonii Cognetti, 1957 accepted as Pionosyllis weismanni Langerhans, 1879 accepted as Brevicirrosyllis weismanni (Langerhans, 1879) (subjective synonym)
61. Species Pionosyllis pigmentata Chamberlin, 1919 accepted as Syllis pigmentata (Chamberlin, 1919) (superseded original combination)
62. Species Pionosyllis procera Hartman, 1965 accepted as Megasyllis procera (Hartman, 1965) (superseded original combination)
63. Species Pionosyllis prolifera (Krohn, 1852) accepted as Syllis prolifera Krohn, 1852
64. Species Pionosyllis propeweismanni Dauvin & Lee, 1983 accepted as Palposyllis propeweismanni (Dauvin & Lee, 1983) (superseded original combination)
65. Species Pionosyllis propreweismanni [auct.] accepted as Palposyllis prosostoma Hartmann-Schröder, 1977 (misspelling of propeweismanni)
66. Species Pionosyllis pulligera (Krohn, 1852) accepted as Nudisyllis pulligera (Krohn, 1852)
67. Species Pionosyllis riojai San Martín, 1990 accepted as Syllis riojai (San Martín, 1990) (superseded original combination)
68. Species Pionosyllis rousei San Martín & Hutchings, 2006 accepted as Opisthodonta rousei (San Martín & Hutchings, 2006) (superseded original combination)
69. Species Pionosyllis samsonensis Hartmann-Schröder, 1980 accepted as Nudisyllis tinihekea Knox & Cameron, 1970 (subjective synonym)
70. Species Pionosyllis serrata Southern, 1914 accepted as Nudisyllis pulligera (Krohn, 1852) (subjective synonym)
71. Species Pionosyllis serratisetosa López, San Martín & Jiménez, 1997 accepted as Opisthodonta serratisetosa (López, San Martín & Jiménez, 1997) (superseded original combination)
72. Species Pionosyllis spinisetosa San Martín, 1990 accepted as Perkinsyllis spinisetosa (San Martín, 1990) (superseded original combination)
73. Species Pionosyllis subterranea Hartmann-Schröder, 1956 accepted as Salvatoria neapolitana (Goodrich, 1930)
74. Species Pionosyllis templadoi San Martín, 1991 accepted as Opisthodonta templadoi (San Martín, 1991) (superseded original combination)
75. Species Pionosyllis typica Moore, 1909 accepted as Typosyllis typica (Moore, 1909) (superseded original combination)
76. Species Pionosyllis uraga Imajima, 1966 accepted as Opisthodonta uraga (Imajima, 1966) (superseded original combination)
77. Species Pionosyllis uruga Imajima, 1966 accepted as Pionosyllis uraga Imajima, 1966 accepted as Opisthodonta uraga (Imajima, 1966) (lapsus calami)
78. Species Pionosyllis weismanni Langerhans, 1879 accepted as Brevicirrosyllis weismanni (Langerhans, 1879) (superseded original combination)
79. Species Pionosyllis weissmanni [auct.] accepted as Pionosyllis weismanni Langerhans, 1879 accepted as Brevicirrosyllis weismanni (Langerhans, 1879) (misspelling)
80. Species Pionosyllis weissmannioides Augener, 1913 accepted as Paraehlersia weissmannioides (Augener, 1913) (superseded original combination)
81. Species Pionosyllis yambaensis Hartmann-Schröder, 1990 accepted as Salvatoria euritmica (Sardá, 1984) (subjective synonym)
82. Species Pionosyllis yolandae San Martín & Hutchings, 2006 accepted as Synmerosyllis yolandae (San Martín & Hutchings, 2006) (superseded original combination)
83. Species Pionosyllis lucida Chamberlin, 1919 (uncertain > nomen dubium)
84. Species Pionosyllis suchumica Czerniavsky, 1881 (uncertain > nomen dubium)

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