Halorhiza Stechow, 1962 accepted as Hydractinia Van Beneden, 1844 (original description)
Halorhiza angusta (Hartlaub, 1904) accepted as Hydractinia angusta Hartlaub, 1904 (new combination reference)
Halorhiza dendritica (Hickson & Gravely, 1907) accepted as Hydractinia dendritica Hickson & Gravely, 1907 (new combination reference)
Hydroconophora Gregory, 1931 † accepted as Hydrocorella Stechow, 1921 (source of synonymy)
Janaria mirabilis Stechow, 1921 (redescription)
Polyhydra Stechow, 1962 accepted as Hydrocorella Stechow, 1921 (original description)
Polyhydra spinifera Stechow, 1962 accepted as Hydrocorella spinifera (Stechow, 1962) (original description)