MolluscaBase eds. (2021). MolluscaBase. Watasella nigra Sasaki, 1920. 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=751016 on 2026-07-02
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2026). European Register of Marine Species. Watasella nigra M. Sasaki, 1920. Accessed at: https://www.vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=751016 on 2026-07-02