World Register of Marine Species (WoRMS)
Schuchert, P.; Choong, H.; Galea, H.; Hoeksema, B.; Lindsay, D.; Manko, M.; Pica, D. (2026). World Hydrozoa Database. Hydractinia ornata Bonnevie, 1899. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=117650 on 2026-08-02
Bonnevie, K. (1898). Zur Systematik der Hydroiden. Zeitschrift für Wissenschaftliche Zoologie. 63: 465-495, plates 25-27.