Higher Classification: > Kingdom Animalia > Subkingdom Parazoa

Placozoa Grell, 1971

Rank: Phylum
Taxon Status: accepted

Children

Treptoplax Monticelli, 1893
Uniplacotomia Tessler, Neumann, Osigus, DeSalle & Schierwater, 2022

English: placozoans

Japanese: 平板動物門

original description	Grell KG. (1971). Trichoplax adhaerens FE Schulze und die Entstehung der Metazoen. Naturwissenschaftliche Rundschau. 24(4):160-161.
basis of record	Margulis, L.; Schwartz, K.V. (1998). Five Kingdoms: an illustrated guide to the Phyla of life on earth. 3rd edition. Freeman: New York, NY (USA). ISBN 0-7167-3027-8. xx, 520 pp.
additional source	Grell, K.G., Ruthmann, A. (1991) Placozoa. In: Harrison FW, Westfall, J.A., editor. Microscopic Anatomy of Invertebrates, Placozoa, Porifera, Cnidaria, and Ctenophora. New York: Wiley-Liss. pp. 13-28
additional source	Ender, A., Schierwater B., 2003. Placozoa are not derived Cnidarians: Evidence from molecular morphology. Mol. Biol. Evol. 20 1: 130-134.
additional source	Schierwater, B.; De Jong, D.; DeSalle, R. (2009). Placozoa and the evolution of Metazoa and intrasomatic cell differentiation. The International Journal of Biochemistry & Cell Biology. 41(2): 370-379.
additional source	Voigt, O.; Collins, A.G.; Pearse, V.B.; Pearse, J.S.; Ender, A.; Hadrys, H.; Schierwater, B. (2004). Placozoa - no longer a phylum of one. Current Biology. 14 (22): 944-945.

Schierwater, B.; Eitel, M.; Osigus, H.-J.; DeSalle, R. (2025). World Placozoa Database. Placozoa. Via: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvantidis, C.; Appeltans, W. (2011) European Register of Marine Species, Accessed through PESI at http://www.eu-nomen.eu/portal/taxon.php?GUID=urn:lsid:marinespecies.org:taxname:22737