MolluscaBase eds. (2021). MolluscaBase.
Portlandia (Yoldiella) A. E. Verrill & Bush, 1897. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2021) European Register of Marine Species at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=742649 on 2024-04-19
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024). European Register of Marine Species.
Portlandia (Yoldiella) A. E. Verrill & K. J. Bush, 1897. Accessed at: https://www.vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=742649 on 2024-04-19