Marcus, Er. (1951). Turbellaria Brasileiros (9). <em>Boletins da Faculdade Filosofia, Ciencias e Letras, Universidade de Sao Paulo, Zoologia.</em> 16: 1-217; plates i-xl.[details] Available for editors
Tyler, S., Artois, T.; Schilling, S.; Hooge, M.; Bush, L.F. (eds) (2006-2024). World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Harsa obnixa Marcus, 1951. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024) European Register of Marine Species at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=155954 on 2024-07-02
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024). European Register of Marine Species. Harsa obnixa Marcus, 1951. Accessed at: https://www.vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=155954 on 2024-07-02
original descriptionMarcus, Er. (1951). Turbellaria Brasileiros (9). <em>Boletins da Faculdade Filosofia, Ciencias e Letras, Universidade de Sao Paulo, Zoologia.</em> 16: 1-217; plates i-xl.[details] Available for editors
Present Inaccurate Introduced: alien Containing type locality
Present 