original descriptionIjima, I. (1896). Notice of New Hexactinellida from Sagami Bay. <em>Zoologischer Anzeiger.</em> 19 (504): 249-254.[details]
additional sourceIjima, I. (1903). Studies on the Hexactinellida. Contribution III. (<i>Placosoma</i>, a New Euplectellid; Leucopsacidae and Caulophacidae). <em>Journal of the College of Sciences, Imperial University of Tokyo.</em> 18 (1): 1-124, pls I-VIII. page(s): 53 [details]
Present Inaccurate Introduced: alien Containing type locality