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The Placozoa are a basal form of invertebrate.<ref></ref> They are the simplest in structure of all non-parasitic multicellular animals (Metazoa). They are generally classified as a single species, Trichoplax adhaerens, although there is enough genetic diversity that it is likely that there are multiple, morphologically similar species.<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref><ref name="Eitel et al 2013">{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> Although they were first discovered in 1883 by the German zoologist, Franz Eilhard Schulze (1840-1921)<ref>F. E. Schulze "Trichoplax adhaerens n. g., n. s.", Zoologischer Anzeiger (Elsevier, Amsterdam and Jena) 6 (1883), p. 92.</ref><ref name=IZ/> and since the 1970s more systematically analyzed by the German protozoologist, Karl Gottlieb Grell (1912-1994),<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> a common name does not yet exist for the taxon; the scientific name literally means "flat animals".<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>

Placozoa sections
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