World Echinoidea Database - Phormosoma placenta placenta Thomson, 1872urn:lsid:marinespecies.org:taxname:422796Kroh, A. (2011). Phormosoma placenta placenta Thomson, 1872. In: Kroh, A. & Mooi, R. (2017). World Echinoidea Database. Accessed at http://www.marinespecies.org/echinoidea../aphia.php?p=taxdetails&id=422796 on 2017-11-18
