(of)Agassiz, L. (1862). Contributions to the natural history of the United States of America. <em>Little Brown, Boston.</em> 4: 1-380, pls 1-19., available online athttps://www.biodiversitylibrary.org/page/16068829 page(s): 353 [details]
Schuchert, P. (2021). World Hydrozoa Database. Phialidium gregarium (Agassiz, 1862). Accessed through: Kennedy, M.K., L. Van Guelpen, G. Pohle, L. Bajona (Eds.) (2021) Canadian Register of Marine Species at: http://marinespecies.org/carms./aphia.php?p=taxdetails&id=292456 on 2024-03-28
Nozères, C., Kennedy, M.K. (Eds.) (2024). Canadian Register of Marine Species. Phialidium gregarium (Agassiz, 1862). Accessed at: https://marinespecies.org/carms/aphia.php?p=taxdetails&id=292456 on 2024-03-28
original description(of)Agassiz, L. (1862). Contributions to the natural history of the United States of America. <em>Little Brown, Boston.</em> 4: 1-380, pls 1-19., available online athttps://www.biodiversitylibrary.org/page/16068829 page(s): 353 [details]
new combination referenceHaeckel, E. (1879). Das System der Medusen. Erster Teil einer Monographie der Medusen. <em>Denkschriften der Medicinisch-Naturwissenschaftlichen Gesellschaft zu Jena.</em> 1: XX+1-360, 320 plates., available online athttps://www.biodiversitylibrary.org/page/32605578 page(s): 188; note: for combination with Phialidium [details]
Present Inaccurate Introduced: alien Containing type locality