original description(ofPsammaplidium exiguum Herdman, 1886)Herdman, W. A. (1886). Report on the tunicata collected during the voyage of H.M.S. "Challenger" during the years 1873-1876. Part. II. Ascidiae compositae. <em>Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873–76. Zoology.</em> 14 (part 38): 1-432, pl. 1-49., available online athttp://www.19thcenturyscience.org/HMSC/HMSC-Reports/Zool-38/README.htm[details]
basis of recordMonniot, C.; Monniot, F.; Griffiths, C. L.; Schleyer, M. (2001). South African Ascidians. <em>Annals of the South African Museum.</em> 108(1): 1-141., available online athttps://www.biodiversitylibrary.org/page/40905479[details]