Clava multicornis (Forsskål, 1775)
Hydractinia americana (Mayer, 1910) accepted as Podocoryna americana (Mayer, 1910)
Hydractinia arge (Clarke, 1882)
Hydractinia borealis (Mayer, 1900) accepted as Podocoryna borealis (Mayer, 1900)
Hydractinia carica Bergh, 1887
Hydractinia carnea (M. Sars, 1846) accepted as Podocoryna carnea M. Sars, 1846
Hydractinia echinata (Fleming, 1828)
Hydractinia monocarpa Allman, 1876
Hydractinia polyclina L. Agassiz, 1860
Hydractinia valens Fraser, 1941
Podocoryna americana (Mayer, 1910)
Podocoryna borealis (Mayer, 1900)
Podocoryna carnea M. Sars, 1846
Podocoryne americana Mayer, 1910 accepted as Podocoryna americana (Mayer, 1910)
Podocoryne carnea M. Sars, 1846 accepted as Podocoryna carnea M. Sars, 1846
Stylactis arge Clarke, 1882 accepted as Hydractinia arge (Clarke, 1882)