Kroh, A.; Mooi, R. (2025). World Echinoidea Database.
Helgocystis Mortensen, 1907. Accessed through: RAS (Eds.) (2025) Register of Antarctic Species at: https://ras.biodiversity.aq/aphia.php/www.pfeil-verlag.de/04biol/www.pfeil-verlag.de/04biol/aphia.php?p=taxdetails&id=160748 on 2025-09-13
RAS (Eds.) (2025). Register of Antarctic Species.
Helgocystis Mortensen, 1907. Accessed at: https://ras.biodiversity.aq/aphia.php?p=taxdetails&id=160748 on 2025-09-13