1. Species Stylactis fucicola (M. Sars, 1857)
2. Species Stylactis inermis Allman, 1872
3. Species Stylactis affinis Jäderholm, 1904 accepted as Perarella affinis (Jäderholm, 1903) (genus transfer)
4. Species Stylactis arctica Jäderholm, 1902 accepted as Hydractinia arctica (Jäderholm, 1902) (basionym)
5. Species Stylactis arge Clarke, 1882 accepted as Hydractinia arge (Clarke, 1882) (basionym)
6. Species Stylactis betkensis Watson, 1978 accepted as Hydractinia betkensis (Watson, 1978) (basionym)
7. Species Stylactis brachyurae Hirohito, 1988 accepted as Hydractinia brachyurae (Hirohito, 1988) (basionym)
8. Species Stylactis carcinicola Hiro, 1939 accepted as Bouillonactinia carcinicola (Hiro, 1939) (basionym)
9. Species Stylactis claviformis Bouillon, 1965 accepted as Hydractinia claviformis (Bouillon, 1965) accepted as Hydractinia proboscidea (Hincks, 1868) (unaccepted > junior subjective synonym)
10. Species Stylactis conchicola Yamada, 1947 accepted as Schuchertinia conchicola (Yamada, 1947) (basionym)
11. Species Stylactis fuciola (Sars, 1857) accepted as Stylactis fucicola (M. Sars, 1857) (unaccepted > misspelling - incorrect subsequent spelling, spelling error)
12. Species Stylactis halecii Hickson & Gravely, 1907 accepted as Rhysia halecii (Hickson & Gravely, 1907) (basionym)
13. Species Stylactis hooperi Sigerfoos, 1899 accepted as Stylactis hooperii Sigerfoos, 1899 accepted as Bouillonactinia hooperii (Sigerfoos, 1899) (unaccepted > misspelling - incorrect subsequent spelling)
14. Species Stylactis hooperii Sigerfoos, 1899 accepted as Bouillonactinia hooperii (Sigerfoos, 1899) (basionym)
15. Species Stylactis inabai Hirohito, 1988 accepted as Hydractinia inabai (Hirohito, 1988) accepted as Bouillonactinia misakiensis (Iwasa, 1934) (basionym)
16. Species Stylactis indica Stechow, 1920 accepted as Cytaeis indica (Stechow, 1920) (genus transfer)
17. Species Stylactis ingolfi Kramp, 1932 accepted as Hydractinia ingolfi (Kramp, 1932)
18. Species Stylactis minoi Alcock, 1892 accepted as Hydractinia minoi (Alcock, 1892) (basionym)
19. Species Stylactis misakiensis (Iwasa, 1934) accepted as Bouillonactinia misakiensis (Iwasa, 1934) (genus transfer)
20. Species Stylactis monoon Hirohito, 1988 accepted as Hydractinia monoon (Hirohito, 1988) (basionym)
21. Species Stylactis piscicola Komai, 1932 accepted as Hydractinia piscicola (Komai, 1932) (basionym)
22. Species Stylactis pruvoti (Motz-Kossowska, 1905) accepted as Hydractinia pruvoti Motz-Kossowska, 1905 accepted as Podocoryna pruvoti (Motz-Kossowska, 1905)
23. Species Stylactis reticulata Hirohito, 1988 accepted as Schuchertinia reticulata (Hirohito, 1988) (basionym)
24. Species Stylactis sagamiensis Hirohito, 1988 accepted as Cytaeis sagamiensis (Hirohito, 1988) (genus transfer)
25. Species Stylactis sandrae Wedler & Larson, 1986 accepted as Hydractinia sandrae (Wedler & Larson, 1986)
26. Species Stylactis spinipapillaris Hirohito, 1988 accepted as Hydractinia spinipapillaris (Hirohito, 1988) (basionym)
27. Species Stylactis spiralis (Goto, 1910) accepted as Hydractinia spiralis Goto, 1910 (unaccepted > superseded combination)
28. Species Stylactis uchidai Yamada, 1947 accepted as Schuchertinia uchidai (Yamada, 1947) (unaccepted > superseded combination, basionym)
29. Species Stylactis vermicola Allman, 1888 accepted as Stylactella vermicola (Allman, 1888)
30. Species Stylactis yerii Iwasa, 1934 accepted as Hydractinia yerii (Iwasa, 1934) (unaccepted > superseded combination)

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