Schuchert, P. (2024). World Hydrozoa Database.
Halecium ralpha Watson & Vervoort, 2001. Accessed through: Marine Species Traits editorial board (2024) Marine Species Traits at: https://www.marinespecies.org/traits./aphia.php?p=taxdetails&id=284763 on 2024-05-08
Marine Species Traits editorial board (2024). Marine Species Traits.
Halecium ralpha Watson & Vervoort, 2001. Accessed at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=284763 on 2024-05-08